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Horsethief Sandstone : ウィキペディア英語版 | Horsethief Sandstone
The Horsethief Sandstone is a Mesozoic geologic formation. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.〔Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.〕 The southern part of the Two Medicine Formation grades into brackish water siltstone/sandstone series composing Horsethief Formation.〔 The sediments of the Horsethief represent shallower water deposits than the Bearpaw Shale adding further evidence of higher elevation areas existing to the south of the Two Medicine Formation's paleoenvironment.〔 ==See also==
* List of dinosaur-bearing rock formations * * List of stratigraphic units with indeterminate dinosaur fossils
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