Pub Date : 2020-06-05DOI: 10.37570/bgsd-2020-68-05
L. Clemmensen, Dennis Kent, M. Mau, O. Mateus, J. Milán
The lithostratigraphy of the Triassic deposits of the Jameson Land Basin in central East Greenland is revised. The new Scoresby Land Supergroup is now composed of the Wordie Creek, Pingo Dal, Gipsdalen and Fleming Fjord Groups. This paper only deals with the lithostratigraphy of the late Early-Late Triassic continental deposits of the latter three groups with emphasis on the vertebratebearing Fleming Fjord Group. The new Pingo Dal Group consists of three new formations, the Rødstaken, Paradigmabjerg and Klitdal Formations (all elevated from members), the new Gipsdalen Group consists of three new formations, the Kolledalen, Solfaldsdal (with the new Gråklint Member) and Kap Seaforth Formations (all elevated from members), and the new Fleming Fjord Group is subdivided into three new formations, the Edderfugledal, Malmros Klint and Ørsted Dal Formations (all elevated from members). The Edderfugledal Formation contains two cyclic bedded, lacustrine members, a lowermost Sporfjeld Member (elevated from beds), and an uppermost Pingel Dal Member (elevated from beds). The lacustrine red beds of the Malmros Klint Formation are not subdivided. The lacustrine and fluvial Ørsted Dal Formation contains three new members. In the eastern and central part of the basin, the formation is initiated by cyclic bedded, red lacustrine mudstones of the Carlsberg Fjord Member (elevated from beds), while in the northwestern part of the basin the lowermost part of the formation is composed of grey fluvial conglomerates and sandstones with subordinate red mudstones of the Bjergkronerne Member (elevated from beds). The uppermost part of the formations in most of the basin is composed of cyclic bedded, variegated lacustrine mudstones and grey to yellowish marlstones of the Tait Bjerg Member (elevated from beds). The sediments in the Fleming Fjord Group contain remains of a rich and diverse vertebrate fauna including dinosaurs, amphibians, turtles, aeotosaurs, pterosaurs, phytosaurs and mammaliaforms. Most vertebrate bones have been found in uppermost Malmros Klint Formation, and in the Carlsberg Fjord and Tait Bjerg Members. The Norian–early Rhaetian, lacustrine Fleming Fjord Group was deposited at about 41° N on the northern part of the supercontinent Pangaea. Lacustrine sedimentation was controlled by seasonal as well as longer-term (orbital) variation in precipitation. Precipitation was probably brought to the basin by southwesterly winds. The lacustrine sediments of the uppermost Fleming Fjord Group show deposition during increasingly humid conditions changing the lake environment from an ephemeral lake-steppe area to a perennial lake. This evolution of lake environment suggests a change from a winter-wet temperate climate to one with precipitation throughout the year.
{"title":"Triassic lithostratigraphy of the Jameson Land Basin (central East\u0000Greenland), with emphasis on the new Fleming Fjord Group","authors":"L. Clemmensen, Dennis Kent, M. Mau, O. Mateus, J. Milán","doi":"10.37570/bgsd-2020-68-05","DOIUrl":"https://doi.org/10.37570/bgsd-2020-68-05","url":null,"abstract":"The lithostratigraphy of the Triassic deposits of the Jameson Land Basin in\u0000central East Greenland is revised. The new Scoresby Land Supergroup is now\u0000composed of the Wordie Creek, Pingo Dal, Gipsdalen and Fleming Fjord Groups.\u0000This paper only deals with the lithostratigraphy of the late Early-Late Triassic\u0000continental deposits of the latter three groups with emphasis on the vertebratebearing\u0000Fleming Fjord Group. The new Pingo Dal Group consists of three new\u0000formations, the Rødstaken, Paradigmabjerg and Klitdal Formations (all elevated\u0000from members), the new Gipsdalen Group consists of three new formations,\u0000the Kolledalen, Solfaldsdal (with the new Gråklint Member) and Kap Seaforth\u0000Formations (all elevated from members), and the new Fleming Fjord Group is\u0000subdivided into three new formations, the Edderfugledal, Malmros Klint and\u0000Ørsted Dal Formations (all elevated from members). The Edderfugledal Formation\u0000contains two cyclic bedded, lacustrine members, a lowermost Sporfjeld Member\u0000(elevated from beds), and an uppermost Pingel Dal Member (elevated from beds).\u0000The lacustrine red beds of the Malmros Klint Formation are not subdivided. The\u0000lacustrine and fluvial Ørsted Dal Formation contains three new members. In the\u0000eastern and central part of the basin, the formation is initiated by cyclic bedded,\u0000red lacustrine mudstones of the Carlsberg Fjord Member (elevated from beds),\u0000while in the northwestern part of the basin the lowermost part of the formation\u0000is composed of grey fluvial conglomerates and sandstones with subordinate red\u0000mudstones of the Bjergkronerne Member (elevated from beds). The uppermost part\u0000of the formations in most of the basin is composed of cyclic bedded, variegated\u0000lacustrine mudstones and grey to yellowish marlstones of the Tait Bjerg Member\u0000(elevated from beds). The sediments in the Fleming Fjord Group contain remains\u0000of a rich and diverse vertebrate fauna including dinosaurs, amphibians, turtles,\u0000aeotosaurs, pterosaurs, phytosaurs and mammaliaforms. Most vertebrate bones\u0000have been found in uppermost Malmros Klint Formation, and in the Carlsberg\u0000Fjord and Tait Bjerg Members. The Norian–early Rhaetian, lacustrine Fleming\u0000Fjord Group was deposited at about 41° N on the northern part of the supercontinent\u0000Pangaea. Lacustrine sedimentation was controlled by seasonal as well as\u0000longer-term (orbital) variation in precipitation. Precipitation was probably brought\u0000to the basin by southwesterly winds. The lacustrine sediments of the uppermost\u0000Fleming Fjord Group show deposition during increasingly humid conditions\u0000changing the lake environment from an ephemeral lake-steppe area to a perennial\u0000lake. This evolution of lake environment suggests a change from a winter-wet\u0000temperate climate to one with precipitation throughout the year.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41469957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-25DOI: 10.37570/bgsd-2020-68-04
M. Bjerager, P. Alsen, J. Bojesen‐Koefoed, M. Fyhn, J. Hovikoski, J. Ineson, H. Nøhr-Hansen, L. Nielsen, S. Piasecki, H. Vosgerau
An updated and revised lithostratigraphic scheme is presented for the Cretaceous of North-East Greenland from Traill Ø in the south to Store Koldewey in the north. The Ryazanian to lower Maastrichtian succession is up to several kilometres thick and comprises four groups, 12 formations and 18 members. The groups record the tectonic evolution of the East Greenland depocentre on the western flank of the evolving proto-Atlantic seaway. The Wollaston Forland Group encompasses the uppermost Jurassic – lowermost Cretaceous rift-climax succession and contains the Lindemans Bugt and Palnatokes Bjerg Formations; two new members of the latter formation are erected from Store Koldewey. Post-rift Cretaceous strata are referred to the new Brorson Halvø Group and the Home Forland Group. The Brorson Halvø Group (uppermost Hauterivian – middle Albian) is dominated by slope and basinal mudstones of the new Stratumbjerg Formation but also includes fluvio-deltaic and shallow marine sandstones of the revised Steensby Bjerg Formation on northern Hold with Hope and submarine slope apron breccias and conglomerates of the revised Rold Bjerge Formation on Traill Ø. The Home Forland Group covers the middle Albian – Coniacian succession. The basal unconformity records an important mid-Albian tectonic event involving intrabasinal uplift, tilting and erosion, as exemplified by the middle Albian conglomerates of the new Kontaktravine Formation on Clavering Ø. The Home Forland Group is dominated regionally by mud-dominated slope to basinal deposits of the elevated and revised Fosdalen Formation; it also includes lowstand basin-floor fan sandstones of the new upper Albian Langsiden Member. The new Jackson Ø Group (upper Turonian – lower Maastrichtian), records a phase of basin reorganisation marked by a significant fall in sedimentation rate in North-East Greenland, probably linked to rift events in, and bypass to, the central proto-Atlantic rift system. The base of the group is an erosional unconformity on Traill Ø and Geographical Society Ø overlain by submarine slope-apron conglomerates of the Turonian Månedal Formation. The base is conformable on Hold with Hope but is defined by a condensed interval (the Coniacian Nanok Member) that is succeeded conformably by slope and basin-floor turbidite sandstones of the Coniacian–Santonian Østersletten Formation and slope to basinal mudstones of the Campanian – lower Maastrichtian Knudshoved Formation. The new Leitch Bjerg Formation of Campanian slope-apron conglomerates and sandstones in eastern Geographical Society Ø erosionally overlies the Knudshoved Formation.
提出了一个更新和修订的格陵兰东北部白垩纪岩石地层方案，从南部的Traillæ到北部的Store Koldewey。梁赞阶至下马斯特里赫特阶层序厚达数公里，由四组、12个地层和18个成员组成。这些群记录了东格陵兰沉积中心的构造演化，该沉积中心位于演化中的原大西洋海道的西侧。Wollaston Forland群包含侏罗纪最上层-白垩纪最下层的裂谷高潮序列，并包含Lindemans Bugt和Palnatokes Bjerg组；后一个编队的两个新成员从Store Koldewey竖立起来。裂谷后白垩纪地层被称为新的Broson-Halvø群和Home-Forland群。Broson-Halvø群（最上层的豪特里夫阶-中阿尔比安阶）以新Stratumjerg组的斜坡和盆地泥岩为主，但也包括北部Hold with Hope改良后的Steensby Bjerg组中的河流三角洲和浅海砂岩，以及Traillæ改良后的Rold Bjerg地层中的海底斜坡护角砾岩和砾岩。主场福兰组覆盖了阿尔比亚-科尼亚奇中期的继承。基底不整合记录了一个重要的阿尔布期中期构造事件，涉及盆地内隆起、倾斜和侵蚀，例如克拉弗林上新Kontaktravine组的阿尔布阶中期砾岩。Home-Forland群在区域上以泥质为主，斜坡至盆地沉积为抬升和修正的Fosdalen组；还包括新上阿尔比安-朗西顿段低位盆底扇砂岩。新的杰克逊群（上土仑阶-下马斯特里赫特阶）记录了一个盆地重组阶段，其特征是格陵兰东北部沉积速率显著下降，可能与中央原大西洋裂谷系的裂谷事件有关，并绕过该裂谷系。该群的底部是Traill和Geographical Society上的侵蚀不整合面，上面覆盖着Turonian Månedal组的海底斜坡护坦砾岩。基底在Hold with Hope上是一致的，但由一个浓缩层段（Coniacian Nanok段）定义，该浓缩层段由Coniacian-SantonianÖstersletten组的斜坡和盆底浊积砂岩以及Campanian-lower Maastrichtian Knudshoved组的斜坡至盆地泥岩一致继承。东部地理学会的Campanian斜坡护坦砾岩和砂岩的新Leitch Bjerg组在侵蚀上覆盖在Knudshoved组上。
{"title":"Cretaceous lithostratigraphy of North-East Greenland","authors":"M. Bjerager, P. Alsen, J. Bojesen‐Koefoed, M. Fyhn, J. Hovikoski, J. Ineson, H. Nøhr-Hansen, L. Nielsen, S. Piasecki, H. Vosgerau","doi":"10.37570/bgsd-2020-68-04","DOIUrl":"https://doi.org/10.37570/bgsd-2020-68-04","url":null,"abstract":"An updated and revised lithostratigraphic scheme is presented for the Cretaceous of North-East Greenland from Traill Ø in the south to Store Koldewey in the north. The Ryazanian to lower Maastrichtian succession is up to several kilometres thick and comprises four groups, 12 formations and 18 members. The groups record the tectonic evolution of the East Greenland depocentre on the western flank of the evolving proto-Atlantic seaway. The Wollaston Forland Group encompasses the uppermost Jurassic – lowermost Cretaceous rift-climax succession and contains the Lindemans Bugt and Palnatokes Bjerg Formations; two new members of the latter formation are erected from Store Koldewey. Post-rift Cretaceous strata are referred to the new Brorson Halvø Group and the Home Forland Group. The Brorson Halvø Group (uppermost Hauterivian – middle Albian) is dominated by slope and basinal mudstones of the new Stratumbjerg Formation but also includes fluvio-deltaic and shallow marine sandstones of the revised Steensby Bjerg Formation on northern Hold with Hope and submarine slope apron breccias and conglomerates of the revised Rold Bjerge Formation on Traill Ø. The Home Forland Group covers the middle Albian – Coniacian succession. The basal unconformity records an important mid-Albian tectonic event involving intrabasinal uplift, tilting and erosion, as exemplified by the middle Albian conglomerates of the new Kontaktravine Formation on Clavering Ø. The Home Forland Group is dominated regionally by mud-dominated slope to basinal deposits of the elevated and revised Fosdalen Formation; it also includes lowstand basin-floor fan sandstones of the new upper Albian Langsiden Member. The new Jackson Ø Group (upper Turonian – lower Maastrichtian), records a phase of basin reorganisation marked by a significant fall in sedimentation rate in North-East Greenland, probably linked to rift events in, and bypass to, the central proto-Atlantic rift system. The base of the group is an erosional unconformity on Traill Ø and Geographical Society Ø overlain by submarine slope-apron conglomerates of the Turonian Månedal Formation. The base is conformable on Hold with Hope but is defined by a condensed interval (the Coniacian Nanok Member) that is succeeded conformably by slope and basin-floor turbidite sandstones of the Coniacian–Santonian Østersletten Formation and slope to basinal mudstones of the Campanian – lower Maastrichtian Knudshoved Formation. The new Leitch Bjerg Formation of Campanian slope-apron conglomerates and sandstones in eastern Geographical Society Ø erosionally overlies the Knudshoved Formation.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41985619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-01DOI: 10.37570/bgsd-2020-68-03
B. Schulz, Madeleine L. Vickers, J. Huggett, H. Madsen, C. Heilmann-Clausen, H. Friis, E. Suess
Pristinely preserved mineral pseudomorphs called glendonites, up to 1.6 m long, from the Palaeogene strata of Denmark allow detailed crystallographic characterisation and add to the understanding of the transformation of the precursor mineral, ikaite (CaCO3·6H2O), to calcite, which constitutes the glendonite. We describe Danish pseudomorphs after ikaite from two localities and formations: the Early Eocene Fur Formation and the Late Oligocene Brejning Formation. This detailed study highlights that key aspects such as morphology and mode of occurrence of these ancient glendonites are identical to those of their parent mineral ikaite, when it grows in marine sediments. Systematic distortion of the angles in glendonite and marine sedimentary ikaite relative to the ideal ikaite symmetry may arise due to the incorporation of organic matter into the crystal structure, and we demonstrate the similarity between modern and ancient ikaite formation zones in the marine sedimentary realm with respect to organic matter.
{"title":"Palaeogene glendonites from Denmark","authors":"B. Schulz, Madeleine L. Vickers, J. Huggett, H. Madsen, C. Heilmann-Clausen, H. Friis, E. Suess","doi":"10.37570/bgsd-2020-68-03","DOIUrl":"https://doi.org/10.37570/bgsd-2020-68-03","url":null,"abstract":"Pristinely preserved mineral pseudomorphs called glendonites, up to 1.6 m long, from the Palaeogene strata of Denmark allow detailed crystallographic characterisation and add to the understanding of the transformation of the precursor mineral, ikaite (CaCO3·6H2O), to calcite, which constitutes the glendonite. We describe Danish pseudomorphs after ikaite from two localities and formations: the Early Eocene Fur Formation and the Late Oligocene Brejning Formation. This detailed study highlights that key aspects such as morphology and mode of occurrence of these ancient glendonites are identical to those of their parent mineral ikaite, when it grows in marine sediments. Systematic distortion of the angles in glendonite and marine sedimentary ikaite relative to the ideal ikaite symmetry may arise due to the incorporation of organic matter into the crystal structure, and we demonstrate the similarity between modern and ancient ikaite formation zones in the marine sedimentary realm with respect to organic matter.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49292613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-13DOI: 10.37570/bgsd-2020-68-02
Ebbe Nyborg, F. Surlyk, N. Thibault
An atlante is a corbel figure (or pillar support) sculpted in the form of a man carrying a heavy load. A group of well-preserved stone carved atlantes from c. 1250 carrying the vaults of the Ribe Cathedral in western Jylland, Denmark, represents the antique titan Atlas and are up to 150 cm high. Their obviously foreign origin has so far remained uncertain. The figures are made of a relatively soft, sandy limestone. A new nannofossil analysis of small chips of the chalky and sandy limestone narrows the age of the stone down to the late Campanian (Late Cretaceous). Upper Campanian sandy limestones of this type are exposed in the Münster Basin in North Rhine-Westphalia, western Germany. The Campanian Baumberger Sandstein in this region fits well with the atlantes in terms of lithology and age and is the only possible provenance of the stone. Around 1250 the Baumberger Sandstein was used for baptismal fonts as far north as Ostfriesland at the Dutch-German border, and it is a novel finding of this investigation that it even reached Denmark. The stone was most likely floated along the rivers Lippe and Rhine and shipped via the Wadden Sea to Ribe. It is a remarkably long transport distance for historic commercial stone transportation in continental northern European art in the High Middle Ages.
{"title":"Provenance of Medieval atlantes in the Ribe Cathedral, Denmark, based on geological and palaeontological investigations","authors":"Ebbe Nyborg, F. Surlyk, N. Thibault","doi":"10.37570/bgsd-2020-68-02","DOIUrl":"https://doi.org/10.37570/bgsd-2020-68-02","url":null,"abstract":"An atlante is a corbel figure (or pillar support) sculpted in the form of a man carrying\u0000a heavy load. A group of well-preserved stone carved atlantes from c. 1250 carrying\u0000the vaults of the Ribe Cathedral in western Jylland, Denmark, represents the antique\u0000titan Atlas and are up to 150 cm high. Their obviously foreign origin has so far remained\u0000uncertain. The figures are made of a relatively soft, sandy limestone. A new\u0000nannofossil analysis of small chips of the chalky and sandy limestone narrows the age\u0000of the stone down to the late Campanian (Late Cretaceous). Upper Campanian sandy\u0000limestones of this type are exposed in the Münster Basin in North Rhine-Westphalia,\u0000western Germany. The Campanian Baumberger Sandstein in this region fits well\u0000with the atlantes in terms of lithology and age and is the only possible provenance\u0000of the stone. Around 1250 the Baumberger Sandstein was used for baptismal fonts\u0000as far north as Ostfriesland at the Dutch-German border, and it is a novel finding of\u0000this investigation that it even reached Denmark. The stone was most likely floated\u0000along the rivers Lippe and Rhine and shipped via the Wadden Sea to Ribe. It is a\u0000remarkably long transport distance for historic commercial stone transportation in\u0000continental northern European art in the High Middle Ages.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46549131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-09DOI: 10.37570/bgsd-2020-68-01
J. S. Peel
A small fauna of middle Cambrian trilobites is described from the upper Telt Bugt Formation of Daugaard-Jensen Land, western North Greenland, and the formation is formally defined. Blainiopsis holt ...
{"title":"Middle Cambrian trilobites (Miaolingian, Ehmaniella Biozone) from the Telt Bugt Formation of Daugaard-Jensen Land, western North Greenland","authors":"J. S. Peel","doi":"10.37570/bgsd-2020-68-01","DOIUrl":"https://doi.org/10.37570/bgsd-2020-68-01","url":null,"abstract":"A small fauna of middle Cambrian trilobites is described from the upper Telt Bugt Formation of Daugaard-Jensen Land, western North Greenland, and the formation is formally defined. Blainiopsis holt ...","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69890258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-11DOI: 10.37570/bgsd-2019-67-06
Morten Bjergager, P. Alsen, J. Hovikoski, S. Lindström, Anders Pilgaard, L. Stemmerik, J. Therkelsen
The Wandel Sea Basin in eastern North Greenland forms the northern continuation of the offshore Danmarkshavn Basin and the conjugate margin to the western Barents Shelf south of Spitsbergen. The Triassic succession of eastern North Greenland, up to 700 m thick, spans the Induan (Dienerian) – Norian. The Triassic sediments rest unconformably on Upper Carboniferous and Upper Permian sediments, and are unconformably overlain by Upper Jurassic – Lower Cretaceous deposits. Based on recent fieldwork in the Wandel Sea Basin, five new and revised Triassic formations are described and included in the Trolle Land Group (revised). The Lower Triassic (Induan) Parish Bjerg Formation (revised) consists of marine sandstones, fluvial conglomerates and sandstones, and muddy flood-plain deposits. It is conformably overlain by Lower Triassic (Dienerian – lower Spathian) offshore mudstones with minor sand-dominated intervals of the Ugleungernes Dal Formation (new). The upper Spathian to Ladinian Dunken Formation (revised) is represented mainly by marine sandstones. A marked erosional unconformity characterises the base of the overlying Upper Triassic (Carnian – Norian) Storekløft Formation (new) composed of marginal marine to marine, massive sandstones and conglomerates as well as cross-bedded and biomottled marine sandstones and minor mudstone units. The Isrand Formation (mainly Middle Triassic) consists of laminated mudstones with minor thin sandstone units that were deposited in slope and basin floor settings in the eastern deeper part of the Wandel Sea Basin in Kronprins Christian Land. The Triassic succession of the Wandel Sea Basin represents a well-constrained shallow shelf to deep shelf / basin floor transect and thus forms an excellent outcrop analogue to the time-equivalent intervals in the western Barents Sea basins and the Danmarkshavn Basin offshore North-East Greenland.
北格陵兰岛东部的Wandel海盆地形成了海上Danmarkshavn盆地的北部延伸，以及斯匹次卑尔根岛以南的西部巴伦支陆架的共轭边缘。北格陵兰岛东部的三叠纪演替，厚达700米，跨越了Induan (Dienerian) - Norian。三叠纪沉积物不整合位于上石炭统和上二叠统沉积物之上，并被上侏罗统-下白垩统沉积物不整合覆盖。根据最近在Wandel海盆地的野外工作，描述了5个新的和修订的三叠纪地层，并将其纳入了特罗勒陆群(修订)。下三叠统(Induan) Parish Bjerg组(订正)由海相砂岩、河流砾岩和砂岩以及泥质洪泛平原沉积组成。它被下三叠统(二叠统-下斯巴达统)近海泥岩整合覆盖，并具有较小的以砂为主的Ugleungernes Dal组(新)层段。上Spathian—Ladinian Dunken组(订正)以海相砂岩为主。上三叠统(卡尼期-诺里期)Storekløft组(新)的基底具有明显的侵蚀不整合特征，该组由边缘海相到海相块状砂岩和砾岩以及交错层状和生物侵蚀的海相砂岩和小型泥岩单元组成。岛组(主要为中三叠统)由层状泥岩和少量薄砂岩单元组成，沉积于Kronprins Christian Land Wandel海盆地东部较深的斜坡和盆地底环境中。Wandel海盆地的三叠纪演替代表了一个约束良好的浅陆架到深陆架/盆地底样带，因此形成了一个与西巴伦支海盆地和格陵兰东北部近海Danmarkshavn盆地的时间等效间隔非常相似的露头。
{"title":"Triassic lithostratigraphy of the Wandel Sea Basin, North Greenland","authors":"Morten Bjergager, P. Alsen, J. Hovikoski, S. Lindström, Anders Pilgaard, L. Stemmerik, J. Therkelsen","doi":"10.37570/bgsd-2019-67-06","DOIUrl":"https://doi.org/10.37570/bgsd-2019-67-06","url":null,"abstract":"The Wandel Sea Basin in eastern North Greenland forms the northern continuation of the offshore Danmarkshavn Basin and the conjugate margin to the western Barents Shelf south of Spitsbergen. The Triassic succession of eastern North Greenland, up to 700 m thick, spans the Induan (Dienerian) – Norian. The Triassic sediments rest unconformably on Upper Carboniferous and Upper Permian sediments, and are unconformably overlain by Upper Jurassic – Lower Cretaceous deposits. Based on recent fieldwork in the Wandel Sea Basin, five new and revised Triassic formations are described and included in the Trolle Land Group (revised). The Lower Triassic (Induan) Parish Bjerg Formation (revised) consists of marine sandstones, fluvial conglomerates and sandstones, and muddy flood-plain deposits. It is conformably overlain by Lower Triassic (Dienerian – lower Spathian) offshore mudstones with minor sand-dominated intervals of the Ugleungernes Dal Formation (new). The upper Spathian to Ladinian Dunken Formation (revised) is represented mainly by marine sandstones. A marked erosional unconformity characterises the base of the overlying Upper Triassic (Carnian – Norian) Storekløft Formation (new) composed of marginal marine to marine, massive sandstones and conglomerates as well as cross-bedded and biomottled marine sandstones and minor mudstone units. The Isrand Formation (mainly Middle Triassic) consists of laminated mudstones with minor thin sandstone units that were deposited in slope and basin floor settings in the eastern deeper part of the Wandel Sea Basin in Kronprins Christian Land. The Triassic succession of the Wandel Sea Basin represents a well-constrained shallow shelf to deep shelf / basin floor transect and thus forms an excellent outcrop analogue to the time-equivalent intervals in the western Barents Sea basins and the Danmarkshavn Basin offshore North-East Greenland.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2019-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47552298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-20DOI: 10.37570/bgsd-2019-67-04
O. Bennike, N. Nørgaard‐Pedersen, J. Jensen, K. Andresen, M. Seidenkrantz
This paper presents new marine evidence of Lateglacial and Holocene environmental changes in the western part of Limfjorden, and provides a review of the geological history/development of this part of northern Jylland, Denmark. Lateglacial clay without fossils is widespread in the region and is probably a glaciolacustrine deposit. Limfjorden began to form as a strait in the Early Holocene due to rising relative sea level and the oldest marine shells are dated to c. 9300 cal. years BP. We propose a new relative sealevel curve for the region based on new and published data, which appear to confirm that the relative sea-level change was not extremely rapid, which was suggested earlier. During the Mid-Holocene a wide connection existed from the western part of Limfjorden to the North Sea in the west and more narrow connections existed between Limfjorden and Skagerrak in the north. The marine fauna included several species that indicate warmer and more salty waters than at present. Gradually, the connections to the North Sea and Skagerrak closed due to long-shore sediment transport and deposition of aeolian sand combined with a fall in the relative sea level during the Middle- to Late Holocene. During the Viking Age, 800–1050 CE (Common Era), the western connection to the North Sea was still open, but around 1200 CE it was closed by a coastal sandy barrier and the western part of Limfjorden became brackish. The coastal barrier was flooded on several occasions but soon formed again. After 1825 CE the western connection from Limfjorden to the North Sea has been maintained artificially.
{"title":"Development of the western Limfjord, Denmark, after the last deglaciation: a review with new data","authors":"O. Bennike, N. Nørgaard‐Pedersen, J. Jensen, K. Andresen, M. Seidenkrantz","doi":"10.37570/bgsd-2019-67-04","DOIUrl":"https://doi.org/10.37570/bgsd-2019-67-04","url":null,"abstract":"This paper presents new marine evidence of Lateglacial and Holocene environmental changes in the western part of Limfjorden, and provides a review of the geological history/development of this part of northern Jylland, Denmark. Lateglacial clay without fossils is widespread in the region and is probably a glaciolacustrine deposit. Limfjorden began to form as a strait in the Early Holocene due to rising relative sea level and the oldest marine shells are dated to c. 9300 cal. years BP. We propose a new relative sealevel curve for the region based on new and published data, which appear to confirm that the relative sea-level change was not extremely rapid, which was suggested earlier. During the Mid-Holocene a wide connection existed from the western part of Limfjorden to the North Sea in the west and more narrow connections existed between Limfjorden and Skagerrak in the north. The marine fauna included several species that indicate warmer and more salty waters than at present. Gradually, the connections to the North Sea and Skagerrak closed due to long-shore sediment transport and deposition of aeolian sand combined with a fall in the relative sea level during the Middle- to Late Holocene. During the Viking Age, 800–1050 CE (Common Era), the western connection to the North Sea was still open, but around 1200 CE it was closed by a coastal sandy barrier and the western part of Limfjorden became brackish. The coastal barrier was flooded on several occasions but soon formed again. After 1825 CE the western connection from Limfjorden to the North Sea has been maintained artificially.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2019-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42856977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-22DOI: 10.37570/bgsd-2018-66-14
O. Malchyk, M. Machalski
The atypical Late Cretaceous nautilid Epicymatoceras vaelsense (Binkhorst van den Binkhorst, 1862) is described and illustrated on the basis of three specimens from the Maastrichtian white chalk of Denmark. One of these is probably from the lower/upper Maastrichtian boundary interval at Frejlev, while the other two originate from the uppermost Maastrichtian chalk as exposed in the Dania quarry; both localities are in Jylland, northern Denmark. These are first reports of E. vaelsense from Denmark; the species has previously been recorded from the uppermost Campanian and lower Maastrichtian of the Netherlands, Belgium, northern Germany and Poland. The presence of E. vaelsense in the topmost Maastrichtian white chalk in the Dania quarry is considered the youngest record of Epicymatoceras known to date, suggesting the persistence of the genus until the end of the Cretaceous. The diameter of the embryonic conch of the Danish E. vaelsense may be estimated at c. 30 mm, based on an individual from the Dania quarry, confirming earlier observations that the species possessed one of the largest embryonic conchs amongst Late Cretaceous nautilids.
非典型的晚白垩世鹦鹉螺Epicymatoceras vaelsense（Binkhorst-van den Binkhorst，1862）是在丹麦马斯特里赫特白白垩系的三个标本的基础上描述和说明的。其中一个可能来自Frejlev的马斯特里赫特阶下/上边界层段，而另外两个可能来自Dania采石场暴露的马斯特里奇特阶最上层白垩；这两个地方都在丹麦北部的吉兰。这些是来自丹麦的E.vaelsense的首次报告；该物种以前曾在荷兰、比利时、德国北部和波兰的坎帕尼亚阶最上层和马斯特里赫特阶下统有记录。在达尼亚采石场马斯特里赫特阶最顶端的白色白垩中发现了E.vaelsense，这被认为是迄今为止已知的最年轻的Epicymatoceras记录，表明该属一直存在到白垩纪末。丹麦E.vaelsense的胚胎海螺的直径估计为c。30毫米，基于达尼亚采石场的一个个体，证实了早期的观察结果，即该物种拥有晚白垩世鹦鹉螺中最大的胚胎海螺之一。
{"title":"First record of Epicymatoceras vaelsense (Nautilida) from the Maastrichtian white chalk of northern Denmark","authors":"O. Malchyk, M. Machalski","doi":"10.37570/bgsd-2018-66-14","DOIUrl":"https://doi.org/10.37570/bgsd-2018-66-14","url":null,"abstract":"The atypical Late Cretaceous nautilid Epicymatoceras vaelsense (Binkhorst van den Binkhorst, 1862) is described and illustrated on the basis of three specimens from the Maastrichtian white chalk of Denmark. One of these is probably from the lower/upper Maastrichtian boundary interval at Frejlev, while the other two originate from the uppermost Maastrichtian chalk as exposed in the Dania quarry; both localities are in Jylland, northern Denmark. These are first reports of E. vaelsense from Denmark; the species has previously been recorded from the uppermost Campanian and lower Maastrichtian of the Netherlands, Belgium, northern Germany and Poland. The presence of E. vaelsense in the topmost Maastrichtian white chalk in the Dania quarry is considered the youngest record of Epicymatoceras known to date, suggesting the persistence of the genus until the end of the Cretaceous. The diameter of the embryonic conch of the Danish E. vaelsense may be estimated at c. 30 mm, based on an individual from the Dania quarry, confirming earlier observations that the species possessed one of the largest embryonic conchs amongst Late Cretaceous nautilids.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2018-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43903451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-06DOI: 10.37570/bgsd-2018-66-13
Thomas Weidner, J. R. Ebbestad
Centropleurid trilobites include five genera of which Centropleura Angelin, Anopolenus Salter, Clarella Howell and Luhops Šnajdr are known from eight species in the traditional middle Cambrian (Miaolingian Series, Drumian Stage) of Sweden and Denmark (Bornholm). Beishanella Xiang & Zhang has not been recorded in Scandinavia so far, and no centropleurids have been reported from Norway. Of these taxa, only Centropleura is common in Scandinavia. Two pygidia previously identified as Centropleura sp. and Anopolenus sp. from erratics in Germany and Bornholm, respectively, as well as a new pygidum from Scania in Sweden are here identified as Anopolenus henrici Salter. Elsewhere, the species is known from Wales, Avalonian Canada, Siberia, Alaska, and Sardinia, occurring in the A. atavus and P. punctuosus zones (the former in Siberia only). The presence of this species increases the known diversity of Centropleuridae in Scandinavia and is important for correlation between Baltica and Avalonia.
中心虫三叶虫包括五个属，其中瑞典和丹麦传统中寒武纪（苗林系，德拉米阶）的八个种中已知中心虫Angelin属、Anopolenus Salter属、Clarella Howell属和LuhopsŠnajdr属。到目前为止，在斯堪的纳维亚半岛还没有记录到Xiang和Zhang的Beishanella，在挪威也没有记录到中心体。在这些分类群中，只有中翅目在斯堪的纳维亚很常见。先前分别来自德国和博恩霍尔姆的两种pygidia被鉴定为Centropleura sp.和Anopolenus sp.，以及来自瑞典斯堪尼亚的一种新的pygidia在这里被鉴定为Anopolens henrici Salter。在其他地方，该物种分布在威尔士、加拿大阿瓦隆、西伯利亚、阿拉斯加和撒丁岛，分布在A.atavus和P.punctusus带（前者仅在西伯利亚）。该物种的存在增加了斯堪的纳维亚地区已知的Centreleuridae的多样性，对Baltica和Avalonia之间的相关性很重要。
{"title":"Anopolenus henrici Salter, a middle Cambrian (Drumian) centropleurid trilobite from the Alum Shale Formation of Scandinavia","authors":"Thomas Weidner, J. R. Ebbestad","doi":"10.37570/bgsd-2018-66-13","DOIUrl":"https://doi.org/10.37570/bgsd-2018-66-13","url":null,"abstract":"Centropleurid trilobites include five genera of which Centropleura Angelin, Anopolenus Salter, Clarella Howell and Luhops Šnajdr are known from eight species in the traditional middle Cambrian (Miaolingian Series, Drumian Stage) of Sweden and Denmark (Bornholm). Beishanella Xiang & Zhang has not been recorded in Scandinavia so far, and no centropleurids have been reported from Norway. Of these taxa, only Centropleura is common in Scandinavia. Two pygidia previously identified as Centropleura sp. and Anopolenus sp. from erratics in Germany and Bornholm, respectively, as well as a new pygidum from Scania in Sweden are here identified as Anopolenus henrici Salter. Elsewhere, the species is known from Wales, Avalonian Canada, Siberia, Alaska, and Sardinia, occurring in the A. atavus and P. punctuosus zones (the former in Siberia only). The presence of this species increases the known diversity of Centropleuridae in Scandinavia and is important for correlation between Baltica and Avalonia.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2018-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46465722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-26DOI: 10.37570/bgsd-2018-66-12
O. Bennike
{"title":"Book Review: Fischer, A. & Pedersen, L. (eds) 2018: Oceans of Archaeology.","authors":"O. Bennike","doi":"10.37570/bgsd-2018-66-12","DOIUrl":"https://doi.org/10.37570/bgsd-2018-66-12","url":null,"abstract":"","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49245005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：