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Samuel Bowring - One of the best experts on this subject based on the ideXlab platform.
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A Late Eocene date for Late Triassic bird tracks
Nature, 2013Co-Authors: Ricardo N. Melchor, Robert Buchwaldt, Samuel BowringAbstract:Arising from R. N. Melchor, S. De Valais & J. F. Genise Nature 417 , 936–938 (2002)10.1038/nature00818 Bird-like tracks from northwest Argentina have been reported as being of Late Triassic age^ 1 . They were attributed to an unknown group of theropods showing some avian characters. However, we believe that these tracks are of Late Eocene age on the basis of a new weighted mean ^206Pb/^238U date (isotope dilution–thermal ionization mass spectrometry method) on zircons from a tuff bed in the sedimentary succession containing the fossil tracks. In consequence, the mentioned tracks are assigned to birds and its occurrence matches the known fossil record of Aves.
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a Late Eocene date for Late triassic bird tracks
Nature, 2013Co-Authors: Ricardo N. Melchor, Robert Buchwaldt, Samuel BowringAbstract:Arising from R. N. Melchor, S. De Valais & J. F. Genise Nature 417, 936–938 (2002) Bird-like tracks from northwest Argentina have been reported as being of Late Triassic age1. They were attributed to an unknown group of theropods showing some avian characters. However, we believe that these tracks are of Late Eocene age on the basis of a new weighted mean 206Pb/238U date (isotope dilution–thermal ionization mass spectrometry method) on zircons from a tuff bed in the sedimentary succession containing the fossil tracks. In consequence, the mentioned tracks are assigned to birds and its occurrence matches the known fossil record of Aves.
Ricardo N. Melchor - One of the best experts on this subject based on the ideXlab platform.
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A Late Eocene date for Late Triassic bird tracks
Nature, 2013Co-Authors: Ricardo N. Melchor, Robert Buchwaldt, Samuel BowringAbstract:Arising from R. N. Melchor, S. De Valais & J. F. Genise Nature 417 , 936–938 (2002)10.1038/nature00818 Bird-like tracks from northwest Argentina have been reported as being of Late Triassic age^ 1 . They were attributed to an unknown group of theropods showing some avian characters. However, we believe that these tracks are of Late Eocene age on the basis of a new weighted mean ^206Pb/^238U date (isotope dilution–thermal ionization mass spectrometry method) on zircons from a tuff bed in the sedimentary succession containing the fossil tracks. In consequence, the mentioned tracks are assigned to birds and its occurrence matches the known fossil record of Aves.
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a Late Eocene date for Late triassic bird tracks
Nature, 2013Co-Authors: Ricardo N. Melchor, Robert Buchwaldt, Samuel BowringAbstract:Arising from R. N. Melchor, S. De Valais & J. F. Genise Nature 417, 936–938 (2002) Bird-like tracks from northwest Argentina have been reported as being of Late Triassic age1. They were attributed to an unknown group of theropods showing some avian characters. However, we believe that these tracks are of Late Eocene age on the basis of a new weighted mean 206Pb/238U date (isotope dilution–thermal ionization mass spectrometry method) on zircons from a tuff bed in the sedimentary succession containing the fossil tracks. In consequence, the mentioned tracks are assigned to birds and its occurrence matches the known fossil record of Aves.
Stéphane Ducrocq - One of the best experts on this subject based on the ideXlab platform.
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First record of Entelodontidae (Mammalia, Artiodactyla) from the Late Eocene of Southeast Asia
Comptes Rendus Palevol, 2019Co-Authors: Stéphane Ducrocq, Yaowalak Chaimanee, Jean-jacques JaegerAbstract:Abstract We describe two entelodontid upper premolars that were recovered from the Late Eocene of the Krabi coal mine in southern Thailand. The size and morphology of the material suggest that it can be referred to Entelodon aff. E. gobiensis, a species known from the Late Eocene to the early Oligocene of northern Asia and southern China. The Thai material documents for the first time the southernmost occurrence of entelodontids in Asia during the Paleogene and also suggests that Eocene Southeast Asian mammal localities might potentially yield further entelodontid remains mostly associated with selenodont unguLates.
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A new baluchimyine rodent from the Late Eocene of the Krabi Basin (Thailand): palaeobiogeographic and biochronologic implications
Comptes Rendus De L Academie Des Sciences Serie Ii Fascicule A-sciences De La Terre Et Des Planetes, 2000Co-Authors: Laurent Marivaux, Stéphane Ducrocq, Jean-jacques Jaeger, Mouloud Benammi, Yaowalak ChaimaneeAbstract:The Latest fieldworks in the Krabi Basin from Thailand have provided accurate stratigraphic, magnetostratigraphic and faunal settings. A complete left maxilla of a new baluchimyine rodent, Baluchimys krabiense nov. sp., described herein, has been found in the Bang Mark pit from the Krabi mine for which a Late Eocene age is attributed. The discovery of such an Eocene baluchimyine in South Asia casts serious doubts on the previous Early Miocene age assignment for Pakistani baluchimyines. Moreover, the comparison with a Late Eocene taxa from North Africa allows us to suggest close phylogenetic relationships, implying that this group had a widespread African–Asian distribution during the Palaeogene. In that context, the endemism assumption reLated to the Indian Subcontinent isolation throughout the Eocene until the Early Miocene is refuted here.
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a new Late Eocene anthropoid primate from thailand
Nature, 1997Co-Authors: Yaowalak Chaimanee, Jean-jacques Jaeger, Varavudh Suteethorn, Stéphane DucrocqAbstract:The fossil record of anthropoid primates from the Middle Eocene of South Asia is so far restricted to two genera (Pondaungia cotteri Pilgrim, 1937 and Amphipithecus mogaungensis Colbert, 1937 from the Eocene Pondaung deposits of Burma) whose anthropoid status and phylogenetic position have long been under debate,1–6 because they represent the oldest highly derived fossil primates of anthropoid grade. Moreover, several new African taxa7–10, some of which are even older, have been recently included in the suborder Anthropoidea, suggesting an African origin for this group. Conversely, new fossil primates recently discovered in China (Eosimias) have been reLated to the most primitive representatives of Anthropoidea, alternatively suggesting an Asian origin and a probable Asian radiation centre11. We report here the discovery of a new anthropoid from the Thai Late Eocene locality of Krabi12,13, which displays several additional anthropoid characters with regard to those of the Eocene Burmese genera. This species, which is about the size of the Fayum Aegyptopithecus, can be reLated to the Burmese forms, and it further provides strong additional evidence for a southeast Asian evolutionary centre for anthropoids.
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A colubrid snake in the Late Eocene of Thailand : the oldest known Colubridae (Reptilia, Serpentes)
1992Co-Authors: Jean-claude Rage, Stéphane Ducrocq, Yaowalak Chaimanee, Jean-jacques Jaeger, Eric Buffetaut, H. Buffetaut-tong, Varavudh SuteethornAbstract:Up to now, the oldest known colubrid snakes were fossils from the early Oligocene of Western Europe and from the Arabian Peninsula. An indeterminate colubrid has been recently recovered in the Late Eocene of Thailand. The presence, in Asia, of the oldest known colubrid snake is consistent with an origin of this family in this continent
Yaowalak Chaimanee - One of the best experts on this subject based on the ideXlab platform.
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First record of Entelodontidae (Mammalia, Artiodactyla) from the Late Eocene of Southeast Asia
Comptes Rendus Palevol, 2019Co-Authors: Stéphane Ducrocq, Yaowalak Chaimanee, Jean-jacques JaegerAbstract:Abstract We describe two entelodontid upper premolars that were recovered from the Late Eocene of the Krabi coal mine in southern Thailand. The size and morphology of the material suggest that it can be referred to Entelodon aff. E. gobiensis, a species known from the Late Eocene to the early Oligocene of northern Asia and southern China. The Thai material documents for the first time the southernmost occurrence of entelodontids in Asia during the Paleogene and also suggests that Eocene Southeast Asian mammal localities might potentially yield further entelodontid remains mostly associated with selenodont unguLates.
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A new baluchimyine rodent from the Late Eocene of the Krabi Basin (Thailand): palaeobiogeographic and biochronologic implications
Comptes Rendus De L Academie Des Sciences Serie Ii Fascicule A-sciences De La Terre Et Des Planetes, 2000Co-Authors: Laurent Marivaux, Stéphane Ducrocq, Jean-jacques Jaeger, Mouloud Benammi, Yaowalak ChaimaneeAbstract:The Latest fieldworks in the Krabi Basin from Thailand have provided accurate stratigraphic, magnetostratigraphic and faunal settings. A complete left maxilla of a new baluchimyine rodent, Baluchimys krabiense nov. sp., described herein, has been found in the Bang Mark pit from the Krabi mine for which a Late Eocene age is attributed. The discovery of such an Eocene baluchimyine in South Asia casts serious doubts on the previous Early Miocene age assignment for Pakistani baluchimyines. Moreover, the comparison with a Late Eocene taxa from North Africa allows us to suggest close phylogenetic relationships, implying that this group had a widespread African–Asian distribution during the Palaeogene. In that context, the endemism assumption reLated to the Indian Subcontinent isolation throughout the Eocene until the Early Miocene is refuted here.
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a new Late Eocene anthropoid primate from thailand
Nature, 1997Co-Authors: Yaowalak Chaimanee, Jean-jacques Jaeger, Varavudh Suteethorn, Stéphane DucrocqAbstract:The fossil record of anthropoid primates from the Middle Eocene of South Asia is so far restricted to two genera (Pondaungia cotteri Pilgrim, 1937 and Amphipithecus mogaungensis Colbert, 1937 from the Eocene Pondaung deposits of Burma) whose anthropoid status and phylogenetic position have long been under debate,1–6 because they represent the oldest highly derived fossil primates of anthropoid grade. Moreover, several new African taxa7–10, some of which are even older, have been recently included in the suborder Anthropoidea, suggesting an African origin for this group. Conversely, new fossil primates recently discovered in China (Eosimias) have been reLated to the most primitive representatives of Anthropoidea, alternatively suggesting an Asian origin and a probable Asian radiation centre11. We report here the discovery of a new anthropoid from the Thai Late Eocene locality of Krabi12,13, which displays several additional anthropoid characters with regard to those of the Eocene Burmese genera. This species, which is about the size of the Fayum Aegyptopithecus, can be reLated to the Burmese forms, and it further provides strong additional evidence for a southeast Asian evolutionary centre for anthropoids.
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A colubrid snake in the Late Eocene of Thailand : the oldest known Colubridae (Reptilia, Serpentes)
1992Co-Authors: Jean-claude Rage, Stéphane Ducrocq, Yaowalak Chaimanee, Jean-jacques Jaeger, Eric Buffetaut, H. Buffetaut-tong, Varavudh SuteethornAbstract:Up to now, the oldest known colubrid snakes were fossils from the early Oligocene of Western Europe and from the Arabian Peninsula. An indeterminate colubrid has been recently recovered in the Late Eocene of Thailand. The presence, in Asia, of the oldest known colubrid snake is consistent with an origin of this family in this continent
Robert Buchwaldt - One of the best experts on this subject based on the ideXlab platform.
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A Late Eocene date for Late Triassic bird tracks
Nature, 2013Co-Authors: Ricardo N. Melchor, Robert Buchwaldt, Samuel BowringAbstract:Arising from R. N. Melchor, S. De Valais & J. F. Genise Nature 417 , 936–938 (2002)10.1038/nature00818 Bird-like tracks from northwest Argentina have been reported as being of Late Triassic age^ 1 . They were attributed to an unknown group of theropods showing some avian characters. However, we believe that these tracks are of Late Eocene age on the basis of a new weighted mean ^206Pb/^238U date (isotope dilution–thermal ionization mass spectrometry method) on zircons from a tuff bed in the sedimentary succession containing the fossil tracks. In consequence, the mentioned tracks are assigned to birds and its occurrence matches the known fossil record of Aves.
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a Late Eocene date for Late triassic bird tracks
Nature, 2013Co-Authors: Ricardo N. Melchor, Robert Buchwaldt, Samuel BowringAbstract:Arising from R. N. Melchor, S. De Valais & J. F. Genise Nature 417, 936–938 (2002) Bird-like tracks from northwest Argentina have been reported as being of Late Triassic age1. They were attributed to an unknown group of theropods showing some avian characters. However, we believe that these tracks are of Late Eocene age on the basis of a new weighted mean 206Pb/238U date (isotope dilution–thermal ionization mass spectrometry method) on zircons from a tuff bed in the sedimentary succession containing the fossil tracks. In consequence, the mentioned tracks are assigned to birds and its occurrence matches the known fossil record of Aves.
