Pub Date : 2020-07-14DOI: 10.1080/10420940.2020.1784160
S. Donovan, M. Simpson
Abstract Many aspects of the palaeontology of the Isle of Wight are well known, but less so its ichnology. A turtle bone, Emys? sp., from the Lower Oligocene (Rupelian) Hamstead Member, Bouldnor Formation, exposed on the north coast of the island, preserves an unusual surface etching. Dictyoporus nodosus Mägdefrau is recorded from the Paleogene for the first time; hitherto, in northern Europe, it was only known from the Mesozoic. This is also its first record in bone. The trace fossil is an elongate reticulate structure which extended onto adjacent parts of the skeleton (not preserved). Morphologically, identical borings in hard substrates should be included in the same ichnogenus; the nature of the substrate – wood, limestone, bone – is a poor ichnotaxobase. Thus, the clavate bone boring, Karethraichnus Zonneveld et al. is synonymized with Gastrochaenolites Leymerie, more common in limestone. The rarity of D. nodosus may be due to collection failure, in part; perhaps collectors are not looking for surface etchings.
{"title":"An etched turtle bone from the Paleogene of the Isle of Wight, UK","authors":"S. Donovan, M. Simpson","doi":"10.1080/10420940.2020.1784160","DOIUrl":"https://doi.org/10.1080/10420940.2020.1784160","url":null,"abstract":"Abstract Many aspects of the palaeontology of the Isle of Wight are well known, but less so its ichnology. A turtle bone, Emys? sp., from the Lower Oligocene (Rupelian) Hamstead Member, Bouldnor Formation, exposed on the north coast of the island, preserves an unusual surface etching. Dictyoporus nodosus Mägdefrau is recorded from the Paleogene for the first time; hitherto, in northern Europe, it was only known from the Mesozoic. This is also its first record in bone. The trace fossil is an elongate reticulate structure which extended onto adjacent parts of the skeleton (not preserved). Morphologically, identical borings in hard substrates should be included in the same ichnogenus; the nature of the substrate – wood, limestone, bone – is a poor ichnotaxobase. Thus, the clavate bone boring, Karethraichnus Zonneveld et al. is synonymized with Gastrochaenolites Leymerie, more common in limestone. The rarity of D. nodosus may be due to collection failure, in part; perhaps collectors are not looking for surface etchings.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"1 1","pages":"56 - 59"},"PeriodicalIF":0.8,"publicationDate":"2020-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73961898","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 : 2020-07-02DOI: 10.1080/10420940.2020.1784159
Lothar H. Vallon, A. Rindsberg, M. Röper, Monika Rothgaenger, Klaus Rothgaenger
Abstract Bromlichnus bromleyi n.igen. n.isp., a compound trace fossil consisting of two segments representing dwelling and feeding, is described. Owing to a concentric spreite in a bow-shaped burrow, B. bromleyi is interpreted as made by holothurians. In most cases, it is connected to a repichnion. The new ichnotaxon derives from the narrow Pfalzpaint Subbasin of the Solnhofen archipelago (Upper Jurassic, SE Germany), interpreted as a tidal channel connecting two basins. The interrelationships of different behaviours reflected in compound trace fossils allow holistic analysis of the work of individual animals, enabling more accurate interpretation of tracemaker anatomy and function.
{"title":"Move, burrow, feed – repeat! A compound trace fossil from the Solnhofen Plattenkalke possibly made by holothurians","authors":"Lothar H. Vallon, A. Rindsberg, M. Röper, Monika Rothgaenger, Klaus Rothgaenger","doi":"10.1080/10420940.2020.1784159","DOIUrl":"https://doi.org/10.1080/10420940.2020.1784159","url":null,"abstract":"Abstract Bromlichnus bromleyi n.igen. n.isp., a compound trace fossil consisting of two segments representing dwelling and feeding, is described. Owing to a concentric spreite in a bow-shaped burrow, B. bromleyi is interpreted as made by holothurians. In most cases, it is connected to a repichnion. The new ichnotaxon derives from the narrow Pfalzpaint Subbasin of the Solnhofen archipelago (Upper Jurassic, SE Germany), interpreted as a tidal channel connecting two basins. The interrelationships of different behaviours reflected in compound trace fossils allow holistic analysis of the work of individual animals, enabling more accurate interpretation of tracemaker anatomy and function.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"25 1","pages":"307 - 316"},"PeriodicalIF":0.8,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77789620","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 : 2020-07-02DOI: 10.1080/10420940.2020.1784161
Lothar H. Vallon, K. Nielsen, J. Milán, A. A. Ekdale, A. Rindsberg, Tina A. Kjeldahl-Vallon
It does not sound like much: one legacy... But the legacy Richard Granville Bromley (Figure 1) left is a huge one. Palaeoichnology cannot be conducted without knowledge of neoichnology; at least, behavioural interpretations are close to impossible. To bring both disciplines closer together, Bromley followed James Hutton’s fundamental principle, “The present is the key to the past.” He promoted interaction among specialists on modern and ancient traces and hence created the slogan “One Ichnology!” This view was exemplified in his textbook Trace Fossils (Bromley, 1990, 1996), in which traces and behaviours of recent organisms were painstakingly described in relation to their surrounding substrate. Unsurprisingly, this key to the past filled half the book. This groundbreaking publication wedded biology and taphonomy. Building on the foundation of the German-speaking school of ichnologists (Abel, Richter, Sch€afer, Seilacher and others), Bromley (like Seilacher) pushed ichnology beyond the purely taxonomical and therefore restrictive boundaries to a more open scientific field that also allows for advanced applications. Richard’s immense understanding of trace fossils and their recent counterparts was frequently conveyed through his dry British humour which often helped to break the ice. Everyone who knew Richard has her or his own memories about him. We have therefore chosen to tell his story partly through anecdotes. Richard Granville Bromley deserves to be remembered not only for his outstanding contributions to ichnology, but also for his great personality. In 2002, Richard was reinvited to give his biannual short-course on trace fossils at the University of Stuttgart, where LHV was a student. Shortly before, LHV had collected a trace fossil from the Lower Triassic of SW Germany and was writing a manuscript about it (Vallon & R€ oper, 2006). The course was the perfect opportunity to learn and get advice from the world-famous Richard Bromley! Courage was needed to approach him after the first day: “Excuse me, please, Dr. Bromley... May I show you a trace fossil I have recently recovered?” The master’s answer was short and conveyed with a friendly smile that whisked away the anxiety of a frightened student: “Call me Richard!” Presented with specimens of what would later become Tripartichnus triassicus, Richard’s judgement was devastating: “Gosh! I have never seen such an ugly trace fossil before!” Nevertheless (or just because?), Richard analysed the cubichnion, trying to find out how and why it was produced. The student took notes, fascinated by Richard’s knowledge and his friendly, humorous manner, not only in private, but also in the classroom. For the latter, he had prepared little animations of animals digging in sediment: a crab walking across the seafloor, burrowing, etc., all on acetate sheets he put on top of one another, moving them indidually by hand on an overhead projector. What a way to end a short course, with a selfcreated trick film
{"title":"One legacy: ONE ICHNOLOGY! Richard Granville Bromley (1939–2018)","authors":"Lothar H. Vallon, K. Nielsen, J. Milán, A. A. Ekdale, A. Rindsberg, Tina A. Kjeldahl-Vallon","doi":"10.1080/10420940.2020.1784161","DOIUrl":"https://doi.org/10.1080/10420940.2020.1784161","url":null,"abstract":"It does not sound like much: one legacy... But the legacy Richard Granville Bromley (Figure 1) left is a huge one. Palaeoichnology cannot be conducted without knowledge of neoichnology; at least, behavioural interpretations are close to impossible. To bring both disciplines closer together, Bromley followed James Hutton’s fundamental principle, “The present is the key to the past.” He promoted interaction among specialists on modern and ancient traces and hence created the slogan “One Ichnology!” This view was exemplified in his textbook Trace Fossils (Bromley, 1990, 1996), in which traces and behaviours of recent organisms were painstakingly described in relation to their surrounding substrate. Unsurprisingly, this key to the past filled half the book. This groundbreaking publication wedded biology and taphonomy. Building on the foundation of the German-speaking school of ichnologists (Abel, Richter, Sch€afer, Seilacher and others), Bromley (like Seilacher) pushed ichnology beyond the purely taxonomical and therefore restrictive boundaries to a more open scientific field that also allows for advanced applications. Richard’s immense understanding of trace fossils and their recent counterparts was frequently conveyed through his dry British humour which often helped to break the ice. Everyone who knew Richard has her or his own memories about him. We have therefore chosen to tell his story partly through anecdotes. Richard Granville Bromley deserves to be remembered not only for his outstanding contributions to ichnology, but also for his great personality. In 2002, Richard was reinvited to give his biannual short-course on trace fossils at the University of Stuttgart, where LHV was a student. Shortly before, LHV had collected a trace fossil from the Lower Triassic of SW Germany and was writing a manuscript about it (Vallon & R€ oper, 2006). The course was the perfect opportunity to learn and get advice from the world-famous Richard Bromley! Courage was needed to approach him after the first day: “Excuse me, please, Dr. Bromley... May I show you a trace fossil I have recently recovered?” The master’s answer was short and conveyed with a friendly smile that whisked away the anxiety of a frightened student: “Call me Richard!” Presented with specimens of what would later become Tripartichnus triassicus, Richard’s judgement was devastating: “Gosh! I have never seen such an ugly trace fossil before!” Nevertheless (or just because?), Richard analysed the cubichnion, trying to find out how and why it was produced. The student took notes, fascinated by Richard’s knowledge and his friendly, humorous manner, not only in private, but also in the classroom. For the latter, he had prepared little animations of animals digging in sediment: a crab walking across the seafloor, burrowing, etc., all on acetate sheets he put on top of one another, moving them indidually by hand on an overhead projector. What a way to end a short course, with a selfcreated trick film","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"108 1","pages":"249 - 257"},"PeriodicalIF":0.8,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87882844","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 : 2020-07-01DOI: 10.1080/10420940.2020.1784158
M. El Hedeny, W. Kassab, M. Rashwan, G. A. Abu El‐Kheir, M. Abdelgawad
Abstract Disconnected aggregates of allochthonous fossil Nypa fruits occur in the Ammonite Hill Member of the Dakhla Formation (Maastrichtian), exposed at the Bir Abu Minqar section, south Western Desert of Egypt. In a pale brown, calcareous siltstone and/or fine-grained sandstone layer, the fossil fruits found are densely infested by the borings Teredolites clavatus and Apectoichnus longissimus. In the specimens described, wood borings assigned to A. longissimus are more abundant than T. clavatus. Remains of the boring bivalves are not preserved. These aggregates of bored fruits likely accumulated in a warm, shallow, well-oxygenated marine environment. Prior to final accumulation, Nypa fruits drifted in seawater only for a short time and exhibit evidence of biostratinomic alterations. The present study is the first to systematically describe the occurrence of both nominal ichnotaxa from the Maastrichtian rocks in Egypt.
摘要:在埃及西南沙漠Bir Abu Minqar剖面，在Dakhla组(Maastrichtian)的amonite Hill段中发现了不完整的外来Nypa果实化石聚集体。在浅棕色的钙质粉砂岩和/或细粒砂岩层中，发现的化石果实密集地布满了钻孔Teredolites clavatus和Apectoichnus longissimus。在所描述的标本中，最长竹属的木孔比棍叶竹丰富。无聊的双壳类动物的残骸没有被保存下来。这些无聊果实的聚集体可能是在温暖、浅、含氧良好的海洋环境中积累起来的。在最终积累之前，Nypa果实在海水中只漂浮了很短的时间，并表现出生物层组学变化的证据。本研究首次系统地描述了埃及马斯特里赫特岩石中这两种名义石类群的出现。
{"title":"Bivalve borings in Maastrichtian fossil Nypa fruits: Dakhla Formation, Bir Abu Minqar, South Western Desert, Egypt","authors":"M. El Hedeny, W. Kassab, M. Rashwan, G. A. Abu El‐Kheir, M. Abdelgawad","doi":"10.1080/10420940.2020.1784158","DOIUrl":"https://doi.org/10.1080/10420940.2020.1784158","url":null,"abstract":"Abstract Disconnected aggregates of allochthonous fossil Nypa fruits occur in the Ammonite Hill Member of the Dakhla Formation (Maastrichtian), exposed at the Bir Abu Minqar section, south Western Desert of Egypt. In a pale brown, calcareous siltstone and/or fine-grained sandstone layer, the fossil fruits found are densely infested by the borings Teredolites clavatus and Apectoichnus longissimus. In the specimens described, wood borings assigned to A. longissimus are more abundant than T. clavatus. Remains of the boring bivalves are not preserved. These aggregates of bored fruits likely accumulated in a warm, shallow, well-oxygenated marine environment. Prior to final accumulation, Nypa fruits drifted in seawater only for a short time and exhibit evidence of biostratinomic alterations. The present study is the first to systematically describe the occurrence of both nominal ichnotaxa from the Maastrichtian rocks in Egypt.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"40 1","pages":"24 - 33"},"PeriodicalIF":0.8,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88092758","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 : 2020-07-01DOI: 10.1080/10420940.2020.1784156
N. Abbassi, Kamal Haji Karim Haji Karim, I. Mohialdeen, Khalid M. I. Sharbazheri
Abstract The Mukdadiya Formation (Late Miocene–Pliocene) consists of alternations of red to brown sandstone and claystone layers in the Zagros Mountains Belt, northeastern Iraq. Two tracksites preserving bird and mammal tracks were recorded from the base of the formation in the Chamchamal area of the Kurdistan region in northeast Iraq. Avian tracks are large footprints with an average length of 25 cm that belong to Avipeda filiportatis. Mammal footprints imprinted by terrestrial cetartiodactyls belong to Pecoripeda amalphaea and Bifidipes velox, with cervids the most likely track makers. An unfamiliar large trace fossil on the studied slab, has symmetrical to asymmetrical marks, kidney or number-8-shaped and strong wrinkles on the surface. We interpret trace as having been produced by cetartiodactyls wallowing on the soft sediment surface. To accommodate this class of behavioral trace fossils; thus, we introduce a new fossilized behavior class, named “Laspichnia”, which includes a vertebrate mud-bathing imprint on a soft sediment surface.
{"title":"Vertebrate footprints and a mammal mud-bath trace fossil (Laspichnia) from the Mukdadiya Formation (Late Miocene–Pliocene), Chamchamal Area, Kurdistan Region, Northeast Iraq","authors":"N. Abbassi, Kamal Haji Karim Haji Karim, I. Mohialdeen, Khalid M. I. Sharbazheri","doi":"10.1080/10420940.2020.1784156","DOIUrl":"https://doi.org/10.1080/10420940.2020.1784156","url":null,"abstract":"Abstract The Mukdadiya Formation (Late Miocene–Pliocene) consists of alternations of red to brown sandstone and claystone layers in the Zagros Mountains Belt, northeastern Iraq. Two tracksites preserving bird and mammal tracks were recorded from the base of the formation in the Chamchamal area of the Kurdistan region in northeast Iraq. Avian tracks are large footprints with an average length of 25 cm that belong to Avipeda filiportatis. Mammal footprints imprinted by terrestrial cetartiodactyls belong to Pecoripeda amalphaea and Bifidipes velox, with cervids the most likely track makers. An unfamiliar large trace fossil on the studied slab, has symmetrical to asymmetrical marks, kidney or number-8-shaped and strong wrinkles on the surface. We interpret trace as having been produced by cetartiodactyls wallowing on the soft sediment surface. To accommodate this class of behavioral trace fossils; thus, we introduce a new fossilized behavior class, named “Laspichnia”, which includes a vertebrate mud-bathing imprint on a soft sediment surface.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"119 1","pages":"72 - 83"},"PeriodicalIF":0.8,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78079391","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 : 2020-05-22DOI: 10.1080/10420940.2020.1763336
Cassian Morelle, J. Denayer
Abstract Ichnofossils from the type locality of the Famennian are here described and figured for the first time. The siliciclastic supratidal alluvial to proximal subtidal deposits of S Belgium yield a diverse ichnofauna composed of Arenicolites ispp. (two morphotypes), Chondrites intricatus, Diplocraterion isp., Dolopichnus gulosus, Gordia marina, Helminthopsis isp., Lockeia cordata, L. siliquaria, Palaeophycus tubularis, P. sulcatus, Planolites isp., Protovirgularia obliterata, P. cf. rugosa, P. isp. and Psammichnites implexus. As a whole, these 16 ichnospecies and 11 ichnogenera form the typical assemblage of the Cruziana ichnofacies where Palaeophycus is largely dominant. However, the Belgian Famennian displays a large range of lithofacies corresponding to various environments in which distinct ichnofossil assemblages are identified. Arenicolites isp. collected from sabkha-type primary dolomite indicates the probable colonisation of hypersaline environment by Arenicolites tracemakers as early as the Late Devonian. The type material of Crossochorda marioni Dewalque, 1881 is revised and attributed to Protovirgularia obliterata and P. cf. rugosa.
本文首次对法门系模式地的鱼化石进行了描述和图解。比利时南部潮上冲积到近潮下沉积的硅质碎屑形成了由砂粒石组成的多样化的鱼动物群。(两种形态)，复杂球粒陨石，双角化。，海蛾，海蛾，海蛾。芦笋，芦笋，芦笋，管状古ophycus，芦笋，Planolites。，隐型原virgularia obliterata, P. cf. rugosa, P. isp。赛米念的隐孔。总的来说，这16种鱼属和11种鱼属构成了典型的古藓属鱼相组合，其中古藓属占主导地位。而比利时法门纪则表现出与不同环境相对应的大范围岩相，并识别出不同的鱼化石组合。似海蚯蚓迹isp。从sabkhah型原生白云岩中收集的数据表明，早在晚泥盆世，砂粒石示踪器可能在高盐环境中定殖。对1881年的marioni Crossochorda Dewalque的类型材料进行了修订，并将其归属于Protovirgularia obliterata和p.c.f rugosa。
{"title":"First description of the ichnofauna from the type locality of the Famennian stage (Late Devonian) of S Belgium","authors":"Cassian Morelle, J. Denayer","doi":"10.1080/10420940.2020.1763336","DOIUrl":"https://doi.org/10.1080/10420940.2020.1763336","url":null,"abstract":"Abstract Ichnofossils from the type locality of the Famennian are here described and figured for the first time. The siliciclastic supratidal alluvial to proximal subtidal deposits of S Belgium yield a diverse ichnofauna composed of Arenicolites ispp. (two morphotypes), Chondrites intricatus, Diplocraterion isp., Dolopichnus gulosus, Gordia marina, Helminthopsis isp., Lockeia cordata, L. siliquaria, Palaeophycus tubularis, P. sulcatus, Planolites isp., Protovirgularia obliterata, P. cf. rugosa, P. isp. and Psammichnites implexus. As a whole, these 16 ichnospecies and 11 ichnogenera form the typical assemblage of the Cruziana ichnofacies where Palaeophycus is largely dominant. However, the Belgian Famennian displays a large range of lithofacies corresponding to various environments in which distinct ichnofossil assemblages are identified. Arenicolites isp. collected from sabkha-type primary dolomite indicates the probable colonisation of hypersaline environment by Arenicolites tracemakers as early as the Late Devonian. The type material of Crossochorda marioni Dewalque, 1881 is revised and attributed to Protovirgularia obliterata and P. cf. rugosa.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"47 1","pages":"384 - 405"},"PeriodicalIF":0.8,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84990642","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 : 2020-05-20DOI: 10.1080/10420940.2020.1763337
M. R. King, Scott E. Botterill, M. Gingras, S. Pemberton
Abstract A proximal distributary channel deposit in the Turonian Ferron Sandstone of central Utah contains a trace-fossil assemblage comprised of turtle tracks (Chelonipus), vertebrate swim trace fossils (Characichnos), repichnial traces of mollusks (Archaeonassa), Rhizocorallium, and Teredolites. Mayflies are abundant producers of horizontal, spreiten, U-shaped burrows in modern freshwater channels, but rarely ascribed as producers of Rhizocorallium in the rock record. The in situ trace fossils studied are interpreted as a freshwater assemblage. Teredolites occurs within allochthonous debris reworked from stratigraphically lower brackish-water deposits. This Ferron Sandstone assemblage provides an example of the juxtaposition of freshwater ichnocoenose with exhumed brackish-water clasts. Caution must be exercised in environmental interpretation when taking into consideration both adjacent floodplain and the sedimentary structures surrounding the clasts. Complex trace-fossil relationships such as these may play a role in the scarcity of Rhizocorallium reports from freshwater deposits in the rock record, and may be more common than presently recognized. This study illustrates the importance of addressing the detailed ichnology above and below the base of channel deposits in progradational environments (e.g., delta plain), where reworked, brackish-water deposits (and bored clasts) may be entrained within overlying lower salinity facies.
{"title":"Rhizocorallium and turtle tracks: a late Cretaceous proximal distributary channel trace-fossil assemblage, central Utah","authors":"M. R. King, Scott E. Botterill, M. Gingras, S. Pemberton","doi":"10.1080/10420940.2020.1763337","DOIUrl":"https://doi.org/10.1080/10420940.2020.1763337","url":null,"abstract":"Abstract A proximal distributary channel deposit in the Turonian Ferron Sandstone of central Utah contains a trace-fossil assemblage comprised of turtle tracks (Chelonipus), vertebrate swim trace fossils (Characichnos), repichnial traces of mollusks (Archaeonassa), Rhizocorallium, and Teredolites. Mayflies are abundant producers of horizontal, spreiten, U-shaped burrows in modern freshwater channels, but rarely ascribed as producers of Rhizocorallium in the rock record. The in situ trace fossils studied are interpreted as a freshwater assemblage. Teredolites occurs within allochthonous debris reworked from stratigraphically lower brackish-water deposits. This Ferron Sandstone assemblage provides an example of the juxtaposition of freshwater ichnocoenose with exhumed brackish-water clasts. Caution must be exercised in environmental interpretation when taking into consideration both adjacent floodplain and the sedimentary structures surrounding the clasts. Complex trace-fossil relationships such as these may play a role in the scarcity of Rhizocorallium reports from freshwater deposits in the rock record, and may be more common than presently recognized. This study illustrates the importance of addressing the detailed ichnology above and below the base of channel deposits in progradational environments (e.g., delta plain), where reworked, brackish-water deposits (and bored clasts) may be entrained within overlying lower salinity facies.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"34 1","pages":"406 - 427"},"PeriodicalIF":0.8,"publicationDate":"2020-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89056098","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 : 2020-04-24DOI: 10.1080/10420940.2020.1755854
E. Olivero, M. L. López Cabrera
Abstract A new high-latitude record of the trace fossil Macaronichnus segregatis degiberti is documented from the lower Miocene Punta Basílica beds, Tierra del Fuego, which were previously considered to be deep-marine channel and levee deposits. Based on a combined ichnological and sedimentological study, however, these beds are herein re-interpreted as shallow-marine, delta-front clinoform deposits. Macaronichnus-bearing beds in the stratigraphically older clinoforms are characterized by: (1) sandstones with wave ripples and wave-ripple cross-lamination; (2) cross-stratified sandstones forming large compound dunes and tidal bars; and (3) intervening heterolithic mudstone-sandstone couplets with current and wave ripples. The sedimentary facies preserving M. s. degiberti were deposited during the onset of transgression, indicated by wave and tide reworking of underlying steeply dipping, delta-front clinoforms deposits. The master bedding surfaces of compound tidal bars are characterized by a dense, monospecific fabric of M. s. degiberti. Compared with other Macaronichnus ichnofabrics, reported elsewhere as characterizing short colonization windows on foresets of tidal dunes or bars, the Punta Basílica ichnofabric represents a longer colonization window, associated with episodic reworking and redeposition of loose, nutrient-rich sand grains just above the master bedding surfaces. The record of M. s. degiberti in Tierra del Fuego supports the previous interpretations that restrain its producer to high-latitude, shallow-marine cold waters.
{"title":"A new shallow-marine, high-latitude record of the trace fossil Macaronichnus in Miocene, reworked delta-front clinoforms, Punta Basílica, Tierra Del Fuego, Argentina","authors":"E. Olivero, M. L. López Cabrera","doi":"10.1080/10420940.2020.1755854","DOIUrl":"https://doi.org/10.1080/10420940.2020.1755854","url":null,"abstract":"Abstract A new high-latitude record of the trace fossil Macaronichnus segregatis degiberti is documented from the lower Miocene Punta Basílica beds, Tierra del Fuego, which were previously considered to be deep-marine channel and levee deposits. Based on a combined ichnological and sedimentological study, however, these beds are herein re-interpreted as shallow-marine, delta-front clinoform deposits. Macaronichnus-bearing beds in the stratigraphically older clinoforms are characterized by: (1) sandstones with wave ripples and wave-ripple cross-lamination; (2) cross-stratified sandstones forming large compound dunes and tidal bars; and (3) intervening heterolithic mudstone-sandstone couplets with current and wave ripples. The sedimentary facies preserving M. s. degiberti were deposited during the onset of transgression, indicated by wave and tide reworking of underlying steeply dipping, delta-front clinoforms deposits. The master bedding surfaces of compound tidal bars are characterized by a dense, monospecific fabric of M. s. degiberti. Compared with other Macaronichnus ichnofabrics, reported elsewhere as characterizing short colonization windows on foresets of tidal dunes or bars, the Punta Basílica ichnofabric represents a longer colonization window, associated with episodic reworking and redeposition of loose, nutrient-rich sand grains just above the master bedding surfaces. The record of M. s. degiberti in Tierra del Fuego supports the previous interpretations that restrain its producer to high-latitude, shallow-marine cold waters.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"11 1","pages":"369 - 383"},"PeriodicalIF":0.8,"publicationDate":"2020-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74427439","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 : 2020-04-15DOI: 10.1080/10420940.2020.1744583
Ricardo N. Melchor, A. Uchman, R. Steel
Abstract This study presents an ichnotaxonomical assessment of bird footprints from a coastal plain setting in the Eocene lower to middle Aspelintoppen Formation in Brongniartfjellet and Storvola, Svalbard. These footprints are unique evidence for Paleogene birds from Svalbard and the second evidence of Paleogene avifauna of the Arctic (along with scarce fossil remains from Ellesmere Island). The analyzed footprints are assigned to six ichnotaxa belonging to three ichnofamilies: Aquatilavipes isp., avian footprint morphotype A and B (ichnofamily Avipedidae); Gruipeda cf. G. abeli, Gruipeda cf. G. dominguensis (ichnofamily Gruipedidae); and Gyeongsangornipes isp. (ichnofamily unknown). Associated invertebrate ichnofossils include Helminthoidichnites tenuis, Cochlichnus anguineus, and Helminthopsis isp. The avian footprints reflect small, medium-sized and rare large birds that can be morphologically compared to those of modern relatives including crane, heron, plover, moorhen, gallinule, oystercatcher and curlew. It is also proposed that in situ sets of shorebird footprints showing a preferred orientation, not composing trackways and showing overprinting, can be used as an indicator of the position and orientation of the shoreline.
摘要对斯瓦尔巴群岛Brongniartfjellet和Storvola地区始新世沿海平原下至中Aspelintoppen组鸟类足迹进行了技术分类研究。这些脚印是斯瓦尔巴群岛古近纪鸟类的独特证据，也是北极古近纪鸟类的第二个证据(还有来自埃尔斯米尔岛的稀有化石遗迹)。分析的足迹归属于3个鱼科的6个鱼分类群:水龙鱼(Aquatilavipes);A、B型鸟类足迹(飞禽科);Gruipeda cf. G. abeli, Gruipeda cf. G. dominguensis(鱼科Gruipeda dae);和庆尚县的isp。(ichnofamily未知)。相关的无脊椎鱼类化石包括Helminthoidichnites tenuis, Cochlichnus anguineus和Helminthopsis isp。鸟类足迹反映了小型，中型和稀有的大型鸟类，可以在形态上与现代近亲进行比较，包括鹤，苍鹭，鸻，赤蛋鸡，捕牡蛎者和杓鹬。此外，我们还提出了一组呈现优先方向的滨鸟足迹，而不是组成轨迹和叠印，可以作为海岸线位置和方向的指示器。
{"title":"Avian diversity and behavior in an Eocene coastal plain, Svalbard: the ichnological evidence","authors":"Ricardo N. Melchor, A. Uchman, R. Steel","doi":"10.1080/10420940.2020.1744583","DOIUrl":"https://doi.org/10.1080/10420940.2020.1744583","url":null,"abstract":"Abstract This study presents an ichnotaxonomical assessment of bird footprints from a coastal plain setting in the Eocene lower to middle Aspelintoppen Formation in Brongniartfjellet and Storvola, Svalbard. These footprints are unique evidence for Paleogene birds from Svalbard and the second evidence of Paleogene avifauna of the Arctic (along with scarce fossil remains from Ellesmere Island). The analyzed footprints are assigned to six ichnotaxa belonging to three ichnofamilies: Aquatilavipes isp., avian footprint morphotype A and B (ichnofamily Avipedidae); Gruipeda cf. G. abeli, Gruipeda cf. G. dominguensis (ichnofamily Gruipedidae); and Gyeongsangornipes isp. (ichnofamily unknown). Associated invertebrate ichnofossils include Helminthoidichnites tenuis, Cochlichnus anguineus, and Helminthopsis isp. The avian footprints reflect small, medium-sized and rare large birds that can be morphologically compared to those of modern relatives including crane, heron, plover, moorhen, gallinule, oystercatcher and curlew. It is also proposed that in situ sets of shorebird footprints showing a preferred orientation, not composing trackways and showing overprinting, can be used as an indicator of the position and orientation of the shoreline.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"64 1","pages":"334 - 343"},"PeriodicalIF":0.8,"publicationDate":"2020-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73262831","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 : 2020-04-11DOI: 10.1080/10420940.2020.1747060
M. Torres-Martínez, Fernando Núñez-Useche, R. Barragán
Abstract Microcoprolites of Palaxius salataensis are non-skeletal carbonate grains produced by callianassid shrimps. This ichnospecies is recognized by four longitudinal canals arranged around a bilateral plane of symmetry, with crescent outline in cross-section. Palaxius salataensis has been previously reported from other countries and in strata from the late Paleozoic to the Mesozoic. In this study, we describe the first Aptian record of the ichnospecies, the first Cretaceous occurrence in North America, and the fifth occurrence worldwide. Palaxius salataensis was found in a packstone-grainstone with abundant pellets and common gastropod shell fragments and subangular, poorly sorted intraclasts. The paleoenvironment was characterized by shallow-waters with high energy conditions, occurring between fair-weather wave base and storm wave base, close to the platform margin, where well-oxygenated and nutrient-rich conditions predominated. The microcoprolite-rich bed of the La Huasteca Canyon occurs on top of an oolitic grainstone interval in the upper levels of the Cupido Formation, interpreted as the termination of the early Aptian Oceanic Anoxic Event 1a (OAE 1a). The presence of P. salataensis in the upper levels of the Cupido Formation is directly related to the availability of organic matter rather than to oxygen recovery.
{"title":"Ichnologic note first occurrence of the microcoprolite Palaxius salataensis in the Aptian (Lower Cretaceous) of northeast Mexico and its paleoecological implications","authors":"M. Torres-Martínez, Fernando Núñez-Useche, R. Barragán","doi":"10.1080/10420940.2020.1747060","DOIUrl":"https://doi.org/10.1080/10420940.2020.1747060","url":null,"abstract":"Abstract Microcoprolites of Palaxius salataensis are non-skeletal carbonate grains produced by callianassid shrimps. This ichnospecies is recognized by four longitudinal canals arranged around a bilateral plane of symmetry, with crescent outline in cross-section. Palaxius salataensis has been previously reported from other countries and in strata from the late Paleozoic to the Mesozoic. In this study, we describe the first Aptian record of the ichnospecies, the first Cretaceous occurrence in North America, and the fifth occurrence worldwide. Palaxius salataensis was found in a packstone-grainstone with abundant pellets and common gastropod shell fragments and subangular, poorly sorted intraclasts. The paleoenvironment was characterized by shallow-waters with high energy conditions, occurring between fair-weather wave base and storm wave base, close to the platform margin, where well-oxygenated and nutrient-rich conditions predominated. The microcoprolite-rich bed of the La Huasteca Canyon occurs on top of an oolitic grainstone interval in the upper levels of the Cupido Formation, interpreted as the termination of the early Aptian Oceanic Anoxic Event 1a (OAE 1a). The presence of P. salataensis in the upper levels of the Cupido Formation is directly related to the availability of organic matter rather than to oxygen recovery.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"53 1","pages":"361 - 368"},"PeriodicalIF":0.8,"publicationDate":"2020-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88759565","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}
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