タイ国東北部のコラート層群より産する恐竜足跡化石について ―足跡相の 概要とその特徴―
- An overview of dinosaur footprints in the Khorat Group, northeastern Thailand, and characteristics of the dinosaur ichnofauna
- タイコク ヒガシホクブ ノ コラートソウグン ヨリ サンスル キョウリュウ アシアト カセキ ニ ツイテ : アシアトソウ ノ ガイヨウ ト ソノ トクチョウ
Late Triassic to Early Cretaceous terrigenous sedimentary rocks are widely distributed in northeastern Thailand. These rocks, traditionally referred to as the Khorat Group, contain abundant dinosaur bones and footprints. In this study, we review previous researches on dinosaur tracks in the Khorat Group with additional new data, and outline the general characteristics of the dinosaur ichnofauna in Thailand. The dinosaur footprints described in this study are from sites at Nam Nao, Tha Song Khon, Non Tum, Phu Kao, Phu Faek, Phu Wiang, Phu Luang, and Tha Uthen. To date, trackways and footprints of theropods, ornithopods, sauropods, archosauromorphs, and other taxa have been reported from these sites; we identified the trackmakers of 132 trackways, consisting of 369 footprints. Theropod tracks constitute 90 % of the footprints. Previous researches and our study on the sedimentology of the Khorat Group indicate that most of the footprints are preserved in sedimentary rocks deposited in fluvial environments, such as in meandering river bars, fluvial shallows, and flood plains.
化石 100 (0), 109-123, 2016-09-30