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The Minnelusa formation of the northwestern Black Hills is divided into four lithological zones, and variations within the highest zone are noted. Four new fossil horizons are recorded, thereby establishing seven fossil horizons in the formation. Lists of fossils collected therein are recorded.
The fossils show that the Minnelusa formation of the Black Hills represents sedimentary deposits equivalent in age to parts of both the Upper and Lower Coal Measures series of the Mississippi Valley. The highest lithological zone yields fossils typical of the Missouri beds, and the lower three yield fossils typical of Des Moines beds.
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