Pub Date : 2020-04-10DOI: 10.1080/10420940.2020.1744586
Carlos Neto de Carvalho, S. Figueiredo, F. Muñiz, J. Belo, P. P. Cunha, A. Baucon, L. Cáceres, J. Rodríguez-Vidal
Abstract In his short joint ventures across the world of vertebrate tracks, Richard Bromley recognized the aeolian sands as unsuitable soft substrates for their preservation. Only after his work in the Balearic Islands, a more systematic study of coastal aeolianites worldwide revealed that these depositional systems could preserve a highly important record of behavioural trace fossils for the evolution of vertebrates, especially in the Pleistocene, including extinct megafauna and the escalation of the Homo. Here we describe coastal aeolianites from the upper Pleistocene of SW Iberia, namely SW Portugal and Gibraltar, with trackways, tracks and trampled surfaces of the last elephants in mainland Europe. Photogrammetric 3 D modelling and analysis of the relevant proboscidean track levels allowed revision of and support for previous ichnotaxonomic identification to Proboscipeda panfamilia and behavioural interpretations of the producer. Smaller and very large trackways and footprints attributed to Palaeoloxodon antiquus are described and discussed according to new and recent, but always rare findings. The seeming progressive and definitive extinction of this species towards southern Iberia, following the same pattern for the replacement of the Neanderthals during the last initial Pleniglacial (until ca. 28 ka), suggests evidence for co-evolution.
{"title":"Tracking the last elephants in Europe during the Würm Pleniglacial: the importance of the Late Pleistocene aeolianite record in SW Iberia","authors":"Carlos Neto de Carvalho, S. Figueiredo, F. Muñiz, J. Belo, P. P. Cunha, A. Baucon, L. Cáceres, J. Rodríguez-Vidal","doi":"10.1080/10420940.2020.1744586","DOIUrl":"https://doi.org/10.1080/10420940.2020.1744586","url":null,"abstract":"Abstract In his short joint ventures across the world of vertebrate tracks, Richard Bromley recognized the aeolian sands as unsuitable soft substrates for their preservation. Only after his work in the Balearic Islands, a more systematic study of coastal aeolianites worldwide revealed that these depositional systems could preserve a highly important record of behavioural trace fossils for the evolution of vertebrates, especially in the Pleistocene, including extinct megafauna and the escalation of the Homo. Here we describe coastal aeolianites from the upper Pleistocene of SW Iberia, namely SW Portugal and Gibraltar, with trackways, tracks and trampled surfaces of the last elephants in mainland Europe. Photogrammetric 3 D modelling and analysis of the relevant proboscidean track levels allowed revision of and support for previous ichnotaxonomic identification to Proboscipeda panfamilia and behavioural interpretations of the producer. Smaller and very large trackways and footprints attributed to Palaeoloxodon antiquus are described and discussed according to new and recent, but always rare findings. The seeming progressive and definitive extinction of this species towards southern Iberia, following the same pattern for the replacement of the Neanderthals during the last initial Pleniglacial (until ca. 28 ka), suggests evidence for co-evolution.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"2006 1","pages":"352 - 360"},"PeriodicalIF":0.8,"publicationDate":"2020-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86978474","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 : 2020-04-10DOI: 10.1080/10420940.2020.1744582
J. Nielsen, Masakazu Nara, A. Jacobsen
Abstract Bowl-shaped structures are for the first time reported from the Greek Island of Rhodes. They occur in Pleistocene deposits of the Cape Arkhangelos Formation in the Rhodes Synthem. The regularity of their three-dimensional appearance is the argument for a biological origin. This gives the reason to assign the structures to Piscichnus waitemata for which we issue a formal diagnosis. They were formed on a clastic carbonate wedge that built into a coastal, steep-sided basin. Associate trace fossils are Thalassinoides suevicus and Bichordites monastiriensis.
{"title":"Bowl-shaped structures in a Pleistocene clastic carbonate wedge on the Island of Rhodes, Greece","authors":"J. Nielsen, Masakazu Nara, A. Jacobsen","doi":"10.1080/10420940.2020.1744582","DOIUrl":"https://doi.org/10.1080/10420940.2020.1744582","url":null,"abstract":"Abstract Bowl-shaped structures are for the first time reported from the Greek Island of Rhodes. They occur in Pleistocene deposits of the Cape Arkhangelos Formation in the Rhodes Synthem. The regularity of their three-dimensional appearance is the argument for a biological origin. This gives the reason to assign the structures to Piscichnus waitemata for which we issue a formal diagnosis. They were formed on a clastic carbonate wedge that built into a coastal, steep-sided basin. Associate trace fossils are Thalassinoides suevicus and Bichordites monastiriensis.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"338 1","pages":"326 - 333"},"PeriodicalIF":0.8,"publicationDate":"2020-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90527001","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 : 2020-04-09DOI: 10.1080/10420940.2020.1744581
Lothar H. Vallon, J. Milán, A. Rindsberg, H. Madsen, J. A. Rasmussen
Abstract Many tracemakers use different materials to line their burrows. Koptichnus rasmussenae n. igen. n. isp. is lined with cuboid fragments of siliceous sponges, interpreted as evidence of harvesting and trimming material to reinforce the burrow wall. The act of trimming, as evidenced in the polyhedral faces, is considered to be behaviourally significant. The tracemaker was evidently a lobster-like crustacean.
{"title":"Cutting-edge technology: burrows lined with sponge bioclasts from the Upper Cretaceous of Denmark","authors":"Lothar H. Vallon, J. Milán, A. Rindsberg, H. Madsen, J. A. Rasmussen","doi":"10.1080/10420940.2020.1744581","DOIUrl":"https://doi.org/10.1080/10420940.2020.1744581","url":null,"abstract":"Abstract Many tracemakers use different materials to line their burrows. Koptichnus rasmussenae n. igen. n. isp. is lined with cuboid fragments of siliceous sponges, interpreted as evidence of harvesting and trimming material to reinforce the burrow wall. The act of trimming, as evidenced in the polyhedral faces, is considered to be behaviourally significant. The tracemaker was evidently a lobster-like crustacean.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"92 1","pages":"317 - 325"},"PeriodicalIF":0.8,"publicationDate":"2020-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89133989","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 : 2020-04-07DOI: 10.1080/10420940.2020.1744585
F. Muñiz, Zain Belaústegui, A. Toscano, Samuel Ramírez-Cruzado, J. Gámez Vintaned
Abstract A new ichnospecies, Linichnus bromleyi, is described on bone substrate as the result of a very likely predator/scavenger interaction. L. bromleyi consists of a single groove with a non-serrated edge. This new ichnotaxon is compared with L. serratus which was defined as a single elongate serrate-edged groove. L. bromleyi has been identified over the surface of bones of marine mammals (in particular, cetaceans and pinnipeds) from two Pliocene outcrops of Andalusia, southern Spain. The new ichnospecies can be clearly related with a trophic interaction between sharks and marine mammals (mainly whales, dolphins and seals).
{"title":"New ichnospecies of Linichnus Jacobsen & Bromley, 2009","authors":"F. Muñiz, Zain Belaústegui, A. Toscano, Samuel Ramírez-Cruzado, J. Gámez Vintaned","doi":"10.1080/10420940.2020.1744585","DOIUrl":"https://doi.org/10.1080/10420940.2020.1744585","url":null,"abstract":"Abstract A new ichnospecies, Linichnus bromleyi, is described on bone substrate as the result of a very likely predator/scavenger interaction. L. bromleyi consists of a single groove with a non-serrated edge. This new ichnotaxon is compared with L. serratus which was defined as a single elongate serrate-edged groove. L. bromleyi has been identified over the surface of bones of marine mammals (in particular, cetaceans and pinnipeds) from two Pliocene outcrops of Andalusia, southern Spain. The new ichnospecies can be clearly related with a trophic interaction between sharks and marine mammals (mainly whales, dolphins and seals).","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"49 1","pages":"344 - 351"},"PeriodicalIF":0.8,"publicationDate":"2020-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90770240","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 : 2020-04-03DOI: 10.1080/10420940.2020.1744587
R. Mikuláš, J. Milán, J. Genise, Markus Bertling, R. Bromley
Abstract An insect boring of unique shape is described from a lignitic layer within the Early Cretaceous (Berriasian) Skyttegård Member of the Rabekke Formation on Bornholm. Morphologically it cannot be compared to any modern or fossil wood borings, although some structures are reminiscent of Scolytidae, Platypodidae and Lymexylonidae. Most probably, however, the tracemaker was a female fungus-farming beetle, thus producing an agrichnion.
{"title":"An insect boring in an Early Cretaceous wood from Bornholm, Denmark","authors":"R. Mikuláš, J. Milán, J. Genise, Markus Bertling, R. Bromley","doi":"10.1080/10420940.2020.1744587","DOIUrl":"https://doi.org/10.1080/10420940.2020.1744587","url":null,"abstract":"Abstract An insect boring of unique shape is described from a lignitic layer within the Early Cretaceous (Berriasian) Skyttegård Member of the Rabekke Formation on Bornholm. Morphologically it cannot be compared to any modern or fossil wood borings, although some structures are reminiscent of Scolytidae, Platypodidae and Lymexylonidae. Most probably, however, the tracemaker was a female fungus-farming beetle, thus producing an agrichnion.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"164 1","pages":"284 - 289"},"PeriodicalIF":0.8,"publicationDate":"2020-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86390671","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 : 2020-04-02DOI: 10.1080/10420940.2020.1744580
Masakazu Nara, Misako Seno’o, Yuta Yamaoka
Abstract Peculiar meniscate burrows with three sediment cords occur in early to middle Miocene tidal-flat deposits of southwestern Japan. Two of the cords are situated at the bottom and the other is at its center. Detailed observations of the burrow structures and comparative neoichnological studies of modern spatangoid burrows in a tidal flat revealed that the former two were true drainage tubes and the latter was fecal in origin. The trace fossil was thus assigned to the ichnogenus Scolicia. Based on these findings, a new ichnospecies Scolicia shirahamensis isp. nov. has been described here. The central sediment cord is seemingly identical to the drainage tube of the ichnogenus Bichordites, another ichnogenus that has been commonly ascribed to a fossil spatangoid burrow, similar to Scolicia. Careless ichnogeneric identification of a spatangoid burrow, based only on the central sediment cord, therefore, may produce an incorrect identification.
{"title":"Scolicia shirahamensis isp. nov.: a triple-corded scolicia and its ichnological implications","authors":"Masakazu Nara, Misako Seno’o, Yuta Yamaoka","doi":"10.1080/10420940.2020.1744580","DOIUrl":"https://doi.org/10.1080/10420940.2020.1744580","url":null,"abstract":"Abstract Peculiar meniscate burrows with three sediment cords occur in early to middle Miocene tidal-flat deposits of southwestern Japan. Two of the cords are situated at the bottom and the other is at its center. Detailed observations of the burrow structures and comparative neoichnological studies of modern spatangoid burrows in a tidal flat revealed that the former two were true drainage tubes and the latter was fecal in origin. The trace fossil was thus assigned to the ichnogenus Scolicia. Based on these findings, a new ichnospecies Scolicia shirahamensis isp. nov. has been described here. The central sediment cord is seemingly identical to the drainage tube of the ichnogenus Bichordites, another ichnogenus that has been commonly ascribed to a fossil spatangoid burrow, similar to Scolicia. Careless ichnogeneric identification of a spatangoid burrow, based only on the central sediment cord, therefore, may produce an incorrect identification.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"57 1","pages":"300 - 306"},"PeriodicalIF":0.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74352814","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 : 2020-04-02DOI: 10.1080/10420940.2019.1698424
J. Farlow, R. Bakker, Benjamin F. Dattilo, E. Everett Deschner, P. Falkingham, Crystal Harter, Richard Solis, D. Temple, W. Ward
Abstract Three parallel, manus-only sauropod trackways from the Coffee Hollow A-Male tracksite (Glen Rose Formation, Kendall County, Texas) were studied separately by researchers from the Heritage Museum of the Texas Hill Country and the Houston Museum of Natural Sciences. Footprint and trackway measurements generally show good agreement between the two groups’ data sets. Footprints appear to be shallowly impressed true tracks rather than undertracks. One of the Coffee Hollow trackways shows marked asymmetry in the lengths of paces that begin with the left as opposed to the right forefoot, and two of the Coffee Hollow trackways are unusually broad. The Coffee Hollow trackways differ enough from the manus portions of other Glen Rose Formation sauropod trackways to suggest that they were made by a different kind of sauropod. Greater differential pressure exerted on the substrate by the forefeet than the hindfeet probably explains the Coffee Hollow trackways, like other manus-only sauropod trackways, but the possibility that they indicate unusual locomotion cannot at present be ruled out.
{"title":"Thunder lizard handstands: Manus-only sauropod trackways from the Glen Rose Formation (Lower Cretaceous, Kendall County, Texas)","authors":"J. Farlow, R. Bakker, Benjamin F. Dattilo, E. Everett Deschner, P. Falkingham, Crystal Harter, Richard Solis, D. Temple, W. Ward","doi":"10.1080/10420940.2019.1698424","DOIUrl":"https://doi.org/10.1080/10420940.2019.1698424","url":null,"abstract":"Abstract Three parallel, manus-only sauropod trackways from the Coffee Hollow A-Male tracksite (Glen Rose Formation, Kendall County, Texas) were studied separately by researchers from the Heritage Museum of the Texas Hill Country and the Houston Museum of Natural Sciences. Footprint and trackway measurements generally show good agreement between the two groups’ data sets. Footprints appear to be shallowly impressed true tracks rather than undertracks. One of the Coffee Hollow trackways shows marked asymmetry in the lengths of paces that begin with the left as opposed to the right forefoot, and two of the Coffee Hollow trackways are unusually broad. The Coffee Hollow trackways differ enough from the manus portions of other Glen Rose Formation sauropod trackways to suggest that they were made by a different kind of sauropod. Greater differential pressure exerted on the substrate by the forefeet than the hindfeet probably explains the Coffee Hollow trackways, like other manus-only sauropod trackways, but the possibility that they indicate unusual locomotion cannot at present be ruled out.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"84 1","pages":"167 - 199"},"PeriodicalIF":0.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76856652","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 : 2020-04-02DOI: 10.1080/10420940.2019.1697263
Johana A. Fernández, J. Chiesa
Abstract This article presents a detailed description of insect trace fossils found in the megaflora of the Gzhelian-Asselian of the Bajo de Veliz. Plant-insect interactions are analyzed on 212 specimens of leaves from this flora, characterized by glossopterid (Gangamopteris, Euryphyllum, Glossopteris), cordaitales, sphenophytes, pteridosperms, lycophytes, conifers and seeds. Marginal feeding, surface and oviposition traces and galling predominate, as compared to the poor representation of piercing and sucking traces. Necrotic tissue was identified on leaves of the genera Euryphyllum, Gangamopteris, Glossopteris and bipinnate fronds of Botrychiopsis, suggesting that damage was produced while the plants were alive. The first reported evidence of galling for Botrychiopsis and piercings traces in Gangamopteris leaves for Gondwana are described.
摘要:本文详细描述了在巴约德韦利兹(Bajo de Veliz)的Gzhelian-Asselian巨型植物群中发现的昆虫痕迹化石。对该植物区系212份叶片进行了植物与昆虫的相互作用分析，其特征为舌蕨科(Gangamopteris, Euryphyllum, gloopteris)、珊瑚科、蕨类、蕨类、石松类、针叶类和种子。与刺穿和吸吮痕迹相比，边缘摄食、表面和产卵痕迹和磨蹭痕迹占主导地位。在蕨类植物Euryphyllum、Gangamopteris、gloopteris和Botrychiopsis的双叶上发现了坏死组织，表明这些植物在活着的时候就已经受到了损伤。首次报道了冈瓦纳Gangamopteris叶片上的刺穿痕迹和芽孢杆菌刺痛的证据。
{"title":"Plant-insect interactions in the fossil flora of the Bajo de Veliz Formation (Gzhelian - Asselian): San Luis, Argentina","authors":"Johana A. Fernández, J. Chiesa","doi":"10.1080/10420940.2019.1697263","DOIUrl":"https://doi.org/10.1080/10420940.2019.1697263","url":null,"abstract":"Abstract This article presents a detailed description of insect trace fossils found in the megaflora of the Gzhelian-Asselian of the Bajo de Veliz. Plant-insect interactions are analyzed on 212 specimens of leaves from this flora, characterized by glossopterid (Gangamopteris, Euryphyllum, Glossopteris), cordaitales, sphenophytes, pteridosperms, lycophytes, conifers and seeds. Marginal feeding, surface and oviposition traces and galling predominate, as compared to the poor representation of piercing and sucking traces. Necrotic tissue was identified on leaves of the genera Euryphyllum, Gangamopteris, Glossopteris and bipinnate fronds of Botrychiopsis, suggesting that damage was produced while the plants were alive. The first reported evidence of galling for Botrychiopsis and piercings traces in Gangamopteris leaves for Gondwana are described.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"41 1","pages":"156 - 166"},"PeriodicalIF":0.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76576838","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 : 2020-04-02DOI: 10.1080/10420940.2020.1744579
F. Rodríguez-Tovar, O. Miguez-Salas, J. Dorador
Abstract Image processing techniques, including the Analyze Particles tool offered by Fiji software and the Intensity Profile by ICY (IP-ICY), were applied in core and outcrop examples to improve characterization of autocomposite ichnofabrics. Analyze Particles gives information about particle shape and size in the studied image. This tool was applied to Chondrites assemblages in composite ichnofabrics in view of selected images of modern marine hemipelagic cores from Site U1385 of IODP Expedition 339. Differences in size, relative abundance, density and distribution of Chondrites were interpreted as related to variations within the population of Chondrites tracemakers. Intensity Profile quantifies pixel values of the infilling material of traces, proving helpful to discriminate between specimens, evaluate the horizon of colonization, and approach the penetration depth. Its application to the analysis of Zoophycos improves characterization of composite ichnofabrics from deep-sea pelagic calcilutites of the Petra Tou Romiou section (Eocene Lefkara Formation; southern Cyprus). Some suites of Zoophycos were interpreted as associated with different phases of colonization from several horizons. Moreover, it was possible to discriminate structures pertaining to different specimens, as opposed to those from the same specimen.
采用斐济软件提供的Analyze Particles工具和ICY (IP-ICY)提供的强度剖面(Intensity Profile)等图像处理技术，对岩心和露头样品进行了分析，以改善自动复合技术织物的表征。Analyze Particles给出了所研究图像中有关颗粒形状和大小的信息。根据IODP 339考察队U1385站点的现代海洋半深海岩芯的选定图像，将该工具应用于复合技术织物中的球粒陨石组合。球粒陨石的大小、相对丰度、密度和分布的差异被解释为与球粒陨石示踪器种群的变化有关。强度剖面量化了痕迹填充材料的像素值，有助于区分标本、评估定殖水平和接近穿透深度。将其应用于动物藻类的分析，提高了Petra Tou Romiou剖面(始新世Lefkara组)深海中上层钙质复合技术织物的表征;塞浦路斯南部)。一些植藻组被解释为与不同阶段的殖民化有关。此外，可以区分属于不同标本的结构，而不是来自同一标本的结构。
{"title":"Image processing techniques to improve characterization of composite ichnofabrics","authors":"F. Rodríguez-Tovar, O. Miguez-Salas, J. Dorador","doi":"10.1080/10420940.2020.1744579","DOIUrl":"https://doi.org/10.1080/10420940.2020.1744579","url":null,"abstract":"Abstract Image processing techniques, including the Analyze Particles tool offered by Fiji software and the Intensity Profile by ICY (IP-ICY), were applied in core and outcrop examples to improve characterization of autocomposite ichnofabrics. Analyze Particles gives information about particle shape and size in the studied image. This tool was applied to Chondrites assemblages in composite ichnofabrics in view of selected images of modern marine hemipelagic cores from Site U1385 of IODP Expedition 339. Differences in size, relative abundance, density and distribution of Chondrites were interpreted as related to variations within the population of Chondrites tracemakers. Intensity Profile quantifies pixel values of the infilling material of traces, proving helpful to discriminate between specimens, evaluate the horizon of colonization, and approach the penetration depth. Its application to the analysis of Zoophycos improves characterization of composite ichnofabrics from deep-sea pelagic calcilutites of the Petra Tou Romiou section (Eocene Lefkara Formation; southern Cyprus). Some suites of Zoophycos were interpreted as associated with different phases of colonization from several horizons. Moreover, it was possible to discriminate structures pertaining to different specimens, as opposed to those from the same specimen.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"70 1","pages":"258 - 267"},"PeriodicalIF":0.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78055128","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 : 2020-04-02DOI: 10.1080/10420940.2019.1612392
J. Foster, M. Lockley
Abstract A newly discovered track in the Chinle Group north of Moab, Utah, is attributable to the ichnogenus Atreipus, an ichnotaxon that is relatively common in eastern North America (Newark Supergroup) but very rare in the Late Triassic of the western part of the continent. This is only the second report of the genus from the Chinle Group. Atreipus has been attributed to a silesaurid dinosauriform, and dinosauriform taxa are relatively abundant by skeletal material in the Late Triassic of western North America, but track evidence in the same units is dominated by ichnotaxa attributed to dinosaurs. The rarity of Atreipus is currently an anomaly in the region.
{"title":"Second occurrence of the dinosauriform ichnogenus Atreipus in the western United States, Upper Triassic Chinle Group of Eastern Utah","authors":"J. Foster, M. Lockley","doi":"10.1080/10420940.2019.1612392","DOIUrl":"https://doi.org/10.1080/10420940.2019.1612392","url":null,"abstract":"Abstract A newly discovered track in the Chinle Group north of Moab, Utah, is attributable to the ichnogenus Atreipus, an ichnotaxon that is relatively common in eastern North America (Newark Supergroup) but very rare in the Late Triassic of the western part of the continent. This is only the second report of the genus from the Chinle Group. Atreipus has been attributed to a silesaurid dinosauriform, and dinosauriform taxa are relatively abundant by skeletal material in the Late Triassic of western North America, but track evidence in the same units is dominated by ichnotaxa attributed to dinosaurs. The rarity of Atreipus is currently an anomaly in the region.","PeriodicalId":51057,"journal":{"name":"Ichnos-An International Journal for Plant and Animal Traces","volume":"4 1","pages":"92 - 96"},"PeriodicalIF":0.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83708489","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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