The Experts below are selected from a list of 63 Experts worldwide ranked by ideXlab platform
M Stimson - One of the best experts on this subject based on the ideXlab platform.
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abstract evidence of fossil horseshoe crabs from joggins nova scotia Paleoichnology and paleonvironmental implications
2010Co-Authors: M Stimson, R A MacraeAbstract:The existence of horseshoe crab activity within the Upper Carboniferous section at Joggins, Nova Scotia is well known, however it remains a poorly studied part of this Coal Age ecosystem. We present an overview of the Paleoichnology of limulids from Joggins and their implications for a possible brackish coastal paleoenvironment. Limulids at Joggins are primarily represented by the trackway Koupichnium, which is characterized by two rows of multiple foot impressions including a Y-shaped impression from the limulid “pusher” foot and a tail drag. By contrast, the arthropod ichnogenus Diplichnites currently includes traces of myriapods, such as the colossal two metre long Arthropleura. Diplichnites is defined as two parallel rows of footprints and it lacks tail drags or Y-shaped foot impressions. The large specimens of Diplichnites at Joggins are interpreted as terrestrial. At smaller sizes undertracks of Koupichnium bear a striking resemblance to small Diplichnites, leading to potential confusion between the two ichnotaxa. Furthermore, intergradations along the length of the trackway between Diplichnites and Koupichnium ichnofossils have also been observed. These discoveries explain the close proximity of both Koupichnium (aquatic limulid) and small Diplichnites (supposed terrestrial myriapod) trackways within the same paleoenvironment at Joggins, which is otherwise a seemingly unlikely association. The taxonomic problems and paleoenviromental interpretations of these two traces are reviewed and possible solutions proposed.
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abstract evidence of fossil horseshoe crabs from the joggins fossil cliffs Paleoichnology and paleonvironmental implications
2009Co-Authors: M Stimson, Andrew MacraeAbstract:The Joggins Fossil Cliffs were inscribed as a UNESCO World Heritage Site in July 2008 and represent the world's finest example of a Coal Age ecosystem. This 15 km-long coastal cliff section displays multiple horizons of fossilized Carboniferous (310–325 Ma) forests. The Joggins fossil cliffs have yielded more than 200 different species of plants and animals, including the fossil record's earliest known amniote (Hylonomous lyelli) and the earliest land snail (Dendropupa vetusa),which are found entombed within the erect fossil lycopsid trees. Body fossils of terrestrial biota are not the only evidence of life preserved in Joggins; a diverse trace fossil assemblage of trackways from both vertebrate and invertebrate life is also found at this site. The trace fossil record at Joggins is as impressive as the creatures themselves and adds an important piece to the puzzle of life during the Coal Age. Although sometimes regarded as less important than body fossils, trace fossils provide important information about the locomotion and behaviour of prehistoric fauna and in some cases are the only evidence of a creature's existence. The existence of horseshoe crab activity within the Joggins Formation is well known; however, it remains a poorly studied part of the Coal Age ecosystem. We present here an overview of the Paleoichnology of Carboniferous limulids from the Joggins Fossil Cliffs and their paleoenviromental implications of a possible coastal connection. Unquestionable undertracks of these limulids have been discovered, examined, and identified as the morphological equivalent to small-scale specimens of the ichnogenus Diplichnites. The ichnogenus Diplichnites is currently assigned to myriapods, including the colossal two metre long, half metre wide Arthropleura. The similarity between the two ichnofossils poses problems for the taxonomy of an already confusing ichnotaxa. On the other hand, it also explains the close proximity of both Koupichnium (limulid) and small-scale Diplichnites (myriapod) trackways within the same paleoenvironment, which is an unlikely association. This issue is reviewed and possible solutions proposed.
Lucas Henrique Medeiros Da Silva - One of the best experts on this subject based on the ideXlab platform.
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overlapping Paleoichnology paleoecology and taphonomy analysis of tooth traces in a late pleistocene early holocene megafaunal assemblage of brazil and description of a new ichnotaxon in hard substrate
Palaeogeography Palaeoclimatology Palaeoecology, 2017Co-Authors: Herminio Ismael De Araujojunior, Fernando Henrique De Souza Barbosa, Lucas Henrique Medeiros Da SilvaAbstract:Abstract Tooth traces are key evidence in vertebrate taphonomy, paleoecology and Paleoichnology. They are product of feeding behavior of vertebrates and can also be evaluated in biostratinomic perspective. Regarding the Quaternary fossil record of vertebrates in Brazil, the taphonomic-paleoecological information of tooth traces has been underexplored. Recently, features of this sort were identified in Quaternary mammals fossils recovered from Lajedo da Escada caves, state of Rio Grande do Norte, northeastern Brazil, consisting in an opportunity to unveil taphonomic, paleoichnological and paleoecological aspects of the Quaternary megafauna. The ichnospecies Machichnus bohemicus and M. fatimae are recorded in the Late Pleistocene-early Holocene age. The latter is a new ichnospecies of Machichnus described herein. The traces M. fatimae and M. bohemicus observed in Glyptotherium sp. were generated outside the cave by an adult individual of the large-sized canid Protocyon troglodytes during event of predation. Nonetheless, M. bohemicus recognized in Eremotherium laurillardi and Smilodon populator was generated by either a juvenile individual of P. troglodytes or an adult of the small-sized canid Cerdocyon thous, in a scavenging context, outside the cave. Probably, other tooth traces previously reported to the Quaternary of Brazil (in the states of Ceara and Minas Gerais) can be assigned to Machichnus.
Andrew Macrae - One of the best experts on this subject based on the ideXlab platform.
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abstract evidence of fossil horseshoe crabs from the joggins fossil cliffs Paleoichnology and paleonvironmental implications
2009Co-Authors: M Stimson, Andrew MacraeAbstract:The Joggins Fossil Cliffs were inscribed as a UNESCO World Heritage Site in July 2008 and represent the world's finest example of a Coal Age ecosystem. This 15 km-long coastal cliff section displays multiple horizons of fossilized Carboniferous (310–325 Ma) forests. The Joggins fossil cliffs have yielded more than 200 different species of plants and animals, including the fossil record's earliest known amniote (Hylonomous lyelli) and the earliest land snail (Dendropupa vetusa),which are found entombed within the erect fossil lycopsid trees. Body fossils of terrestrial biota are not the only evidence of life preserved in Joggins; a diverse trace fossil assemblage of trackways from both vertebrate and invertebrate life is also found at this site. The trace fossil record at Joggins is as impressive as the creatures themselves and adds an important piece to the puzzle of life during the Coal Age. Although sometimes regarded as less important than body fossils, trace fossils provide important information about the locomotion and behaviour of prehistoric fauna and in some cases are the only evidence of a creature's existence. The existence of horseshoe crab activity within the Joggins Formation is well known; however, it remains a poorly studied part of the Coal Age ecosystem. We present here an overview of the Paleoichnology of Carboniferous limulids from the Joggins Fossil Cliffs and their paleoenviromental implications of a possible coastal connection. Unquestionable undertracks of these limulids have been discovered, examined, and identified as the morphological equivalent to small-scale specimens of the ichnogenus Diplichnites. The ichnogenus Diplichnites is currently assigned to myriapods, including the colossal two metre long, half metre wide Arthropleura. The similarity between the two ichnofossils poses problems for the taxonomy of an already confusing ichnotaxa. On the other hand, it also explains the close proximity of both Koupichnium (limulid) and small-scale Diplichnites (myriapod) trackways within the same paleoenvironment, which is an unlikely association. This issue is reviewed and possible solutions proposed.
Herminio Ismael De Araujojunior - One of the best experts on this subject based on the ideXlab platform.
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overlapping Paleoichnology paleoecology and taphonomy analysis of tooth traces in a late pleistocene early holocene megafaunal assemblage of brazil and description of a new ichnotaxon in hard substrate
Palaeogeography Palaeoclimatology Palaeoecology, 2017Co-Authors: Herminio Ismael De Araujojunior, Fernando Henrique De Souza Barbosa, Lucas Henrique Medeiros Da SilvaAbstract:Abstract Tooth traces are key evidence in vertebrate taphonomy, paleoecology and Paleoichnology. They are product of feeding behavior of vertebrates and can also be evaluated in biostratinomic perspective. Regarding the Quaternary fossil record of vertebrates in Brazil, the taphonomic-paleoecological information of tooth traces has been underexplored. Recently, features of this sort were identified in Quaternary mammals fossils recovered from Lajedo da Escada caves, state of Rio Grande do Norte, northeastern Brazil, consisting in an opportunity to unveil taphonomic, paleoichnological and paleoecological aspects of the Quaternary megafauna. The ichnospecies Machichnus bohemicus and M. fatimae are recorded in the Late Pleistocene-early Holocene age. The latter is a new ichnospecies of Machichnus described herein. The traces M. fatimae and M. bohemicus observed in Glyptotherium sp. were generated outside the cave by an adult individual of the large-sized canid Protocyon troglodytes during event of predation. Nonetheless, M. bohemicus recognized in Eremotherium laurillardi and Smilodon populator was generated by either a juvenile individual of P. troglodytes or an adult of the small-sized canid Cerdocyon thous, in a scavenging context, outside the cave. Probably, other tooth traces previously reported to the Quaternary of Brazil (in the states of Ceara and Minas Gerais) can be assigned to Machichnus.
R A Macrae - One of the best experts on this subject based on the ideXlab platform.
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abstract evidence of fossil horseshoe crabs from joggins nova scotia Paleoichnology and paleonvironmental implications
2010Co-Authors: M Stimson, R A MacraeAbstract:The existence of horseshoe crab activity within the Upper Carboniferous section at Joggins, Nova Scotia is well known, however it remains a poorly studied part of this Coal Age ecosystem. We present an overview of the Paleoichnology of limulids from Joggins and their implications for a possible brackish coastal paleoenvironment. Limulids at Joggins are primarily represented by the trackway Koupichnium, which is characterized by two rows of multiple foot impressions including a Y-shaped impression from the limulid “pusher” foot and a tail drag. By contrast, the arthropod ichnogenus Diplichnites currently includes traces of myriapods, such as the colossal two metre long Arthropleura. Diplichnites is defined as two parallel rows of footprints and it lacks tail drags or Y-shaped foot impressions. The large specimens of Diplichnites at Joggins are interpreted as terrestrial. At smaller sizes undertracks of Koupichnium bear a striking resemblance to small Diplichnites, leading to potential confusion between the two ichnotaxa. Furthermore, intergradations along the length of the trackway between Diplichnites and Koupichnium ichnofossils have also been observed. These discoveries explain the close proximity of both Koupichnium (aquatic limulid) and small Diplichnites (supposed terrestrial myriapod) trackways within the same paleoenvironment at Joggins, which is otherwise a seemingly unlikely association. The taxonomic problems and paleoenviromental interpretations of these two traces are reviewed and possible solutions proposed.