The Khok Kruat Formation is the upper part of the Khorat Group,which consists of upper Lower Cretaceous non-marine sedimentary rocks in northeastern Thailand.Many dinosaur footprints have been known from the upper Low...The Khok Kruat Formation is the upper part of the Khorat Group,which consists of upper Lower Cretaceous non-marine sedimentary rocks in northeastern Thailand.Many dinosaur footprints have been known from the upper Lower Cretaceous(Aptian-Albian)Khok Kruat Formation at the Huai Dam Chum(Tha Uthen)site,northeastern Thailand.Approximately 600 tracks occur in thin mudstone layer of the northern part of the outcrop at the Huai Dam Chum track site.Two types of footprints,small-sized theropod and crocodylomorph are imprinted with mud cracks and ripple marks on the thin mud layer.Most of footprints are referred to cf.Asianopodus,and are imprinted by small-sized theropoda,probably ornithomimosauria.Theropod tracks are mainly separated into two groups,Group A and Group B.From ichnological viewpoints,the small-sized theropod track assemblage indicates the herd behaviour and its idiosyncratic group composition.In particular,the histogram of size-frequency measurements of Group A shows the anomalous bimodal distribution.We consider that there are two hypotheses;the first one is due to the male-female difference,and the second is a result of the different growing stage.展开更多
Tectonic subdivision of mainland Thailand has been discussed by means of Paleozoic and Mesozoic stratigraphy,micropaleontology represented by foraminiferal and radiolarian biostratigraphy and paleobiogeography,tectoni...Tectonic subdivision of mainland Thailand has been discussed by means of Paleozoic and Mesozoic stratigraphy,micropaleontology represented by foraminiferal and radiolarian biostratigraphy and paleobiogeography,tectonic settings of granitoids,展开更多
The Inthanon Zone of Northern Thailand,originally proposed by Barr and Macdonald(1991),is characterized by the occurrence of Paleo-Tethyan pelagic sediments including Carboniferous-Permian seamount-type carbonate asso...The Inthanon Zone of Northern Thailand,originally proposed by Barr and Macdonald(1991),is characterized by the occurrence of Paleo-Tethyan pelagic sediments including Carboniferous-Permian seamount-type carbonate associated with oceanic展开更多
文摘The Khok Kruat Formation is the upper part of the Khorat Group,which consists of upper Lower Cretaceous non-marine sedimentary rocks in northeastern Thailand.Many dinosaur footprints have been known from the upper Lower Cretaceous(Aptian-Albian)Khok Kruat Formation at the Huai Dam Chum(Tha Uthen)site,northeastern Thailand.Approximately 600 tracks occur in thin mudstone layer of the northern part of the outcrop at the Huai Dam Chum track site.Two types of footprints,small-sized theropod and crocodylomorph are imprinted with mud cracks and ripple marks on the thin mud layer.Most of footprints are referred to cf.Asianopodus,and are imprinted by small-sized theropoda,probably ornithomimosauria.Theropod tracks are mainly separated into two groups,Group A and Group B.From ichnological viewpoints,the small-sized theropod track assemblage indicates the herd behaviour and its idiosyncratic group composition.In particular,the histogram of size-frequency measurements of Group A shows the anomalous bimodal distribution.We consider that there are two hypotheses;the first one is due to the male-female difference,and the second is a result of the different growing stage.
文摘Tectonic subdivision of mainland Thailand has been discussed by means of Paleozoic and Mesozoic stratigraphy,micropaleontology represented by foraminiferal and radiolarian biostratigraphy and paleobiogeography,tectonic settings of granitoids,
文摘The Inthanon Zone of Northern Thailand,originally proposed by Barr and Macdonald(1991),is characterized by the occurrence of Paleo-Tethyan pelagic sediments including Carboniferous-Permian seamount-type carbonate associated with oceanic
