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The Cody Shale is a Late Cretaceous geologic formation. It is mapped in Wyoming, Idaho, and Montana. The formation is described by W.G. Pierce as follows: upper part is buff, sandy shale and thinly laminated buff sandstone; lower part is dark gray, thin-bedded marine shale.〔Pierce, W.G., 1997, Geologic map of the Cody 1 degree x 2 degrees quadrangle, northwestern Wyoming: U.S. Geological Survey, Miscellaneous Geologic Investigations Map I-2500, scale 1:250000.〕 The formation is divided into many members (alphabetical):〔http://ngmdb.usgs.gov/Geolex/NewUnits/unit_7568.html USGS GEOLEX, retrieved 18 April 2010〕 *Ardmore Bentonite Beds (WY) *Belle Fourche Member (MT, WY) *Carlile Member (MT, WY) *Claggett Member (MT, WY) *Eldridge Creek Member (MT) *Gammon Ferruginous Member (MT, WY) *Greenhorn Calcareous Member (MT) *Niobrara Member (MT, WY) *Sage Breaks Member (WY) *Shannon Sandstone Member (MT, WY) *Steele Member (WY) *Sussex Sandstone Member (WY) *Telegraph Creek Member (MT, WY) *Wallace Creek Tongue (WY) ==References== 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「Cody Shale」の詳細全文を読む スポンサード リンク
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