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Finished loading and pulled south about twenty miles camping on a tributary of Indian Creek at night. Country seems to be Fort Pierre formation collected some invertebrates and located saurian bones near the road as it comes out over the first black shale ledge on east side of Cottonwood Creek These bones were in limestone concretions and concretions contain Baculites and fish remains as well From Edgemont south on the Cottonwood these are several successive ledges of sandstone of ??? yellow containing in the lowest ledge only Mytalis very abundant; rocks composed entirely of these shells in places The next sandstone layer contains mostly scaphites Spent today collecting fish remains in the black shale blow outs near last night?s camp. Found a complete mosasaur skeleton, uncrushed, in shale: Easy to work out. Very little concretion mixed in with it. Found great numbers of fish remains, skull, jaws and parts of skeletons though few were connected. Made a permanent camp in a tributary of Indian Creek south of blowout on Old Cheyenne Deadwood trail. It rained in the afternoon making camp disagreeable. Water so heavily saturated with gypsum and other salts that it cannot be used for drinking or wash water. Get water from the pools in top of hills.