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Ellis Group
The Ellis Group is a stratigraphical unit of Bajocian-Oxfordian age in the Western Canadian Sedimentary Basin. It takes the name from Fort Ellis, Montana, and was first described in outcrop in the Rocky Creek Canyon by .C. Peale in 1893.〔Peale, A.C., 1893. The Paleozoic section in the vicinity of Three Forks, Montana. United States Geological Survey, Bulletin 110, p.9-56.〕 ==Lithology== The Ellis Group is composed of shale and sandstones deposited in marine and transitional environment. 〔 〕
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