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The Early Cretaceous Phra Wihan Formation is the second lowest member of the Mesozoic Korat Group which outcrops in Northeast Thailand. Comprises fine- to coarse-grained sheet and channelled sandstone beds and rarer variegated siltstone and mudstone. Intermittent conglomerate beds. Deposited in a fluvial environment dominated by high-energy, shallow braided rivers with subordinate lower energy meandering river systems and associated flood plains. The Phra Wihan Formation is considered to be Berriasian-Barremian in age based on recent palynology evidence.〔Suteetorn and Jarnyahran (1986). "Geological Map of Thailand." Sheet NE 48-14 1:250,000.〕〔Racey and Goodall (2009). "Late Palaeozoic and Mesozoic Ecosystems in SE Asia". Geological Society. London. Special Publication 315 Pp 69-84.〕 Sauropod (fossil) tracks have been recorded from this formation.〔Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.〕 ==See also== * List of dinosaur-bearing rock formations * * List of stratigraphic units with sauropodomorph tracks * * * Sauropod tracks 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Phra Wihan Formation」の詳細全文を読む スポンサード リンク
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