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Several trace fossil assemblages from the clastic members of three Upper Pennsylvanian cyclothems in the state of Kansas are considered to represent marginal marine (brackish-marine) environments. Trace fossils were collected from several lenticular- or flaser-bedded siltstone and fine-grained sandstone horizons within the Rock Lake Shale, Timberhill Siltstone, and Lawrence Shale. These units were commonly thought to be nonmarine (freshwater to subaerial exposure) due to the general lack of marine body fossils. Common trace fossils are Asteriacites, Lingulichnus. lsopodirhnus. Chondrites, Didymaulichnus, Pelecypodichnus, and Planolites. The trace fossil assemblages are characterized by the following: (1) small-sized members; (2) excellent preservation; (3)...

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