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The Mengyin Formation is a Mesozoic geologic formation. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.〔Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.〕 The type material for the titanosauriform dinosaur ''Euhelopus'' was excavated at this formation by Otto Zdansky in 1923, in green/yellow sandstone and green/yellow siltstone that were deposited during the Barremian or Aptian stages of the Cretaceous period, approximately 129 to 113 million years ago.〔H. C. T'an. 1923. New research on the Mesozoic and early Tertiary geology in Shantung. Geological Survey of China Bulletin 5:95-135〕 ==See also== * List of dinosaur-bearing rock formations * * List of stratigraphic units with few dinosaur genera 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「Mengyin Formation」の詳細全文を読む スポンサード リンク
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