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Acknowledgments Historical background Geologic setting Stratigraphic resume Niobrara Formation Pierre Shale   Sharon Springs Member. Weskan Member Lake Creek Member Salt Grass Member Unnamed member Beecher Island Member... Sharon Springs Member Dark soft shale unit Organic-rich shale unit Phosphatic shale unit. ... Rate of sedimentation 1 1 3 3 5 6 6 7 7 7 9 10 10 10 10 11 11 14 16 Composition  Previous studies   .  Mineralogy  Niobrara Formation Sharon Springs Member of the Pierre Shale. Upper members of the Pierre Shale. Bentonites Basaluminite and hydrobasaluminite.  Potassium feldspar  Barite and apatite Chemical composition Mode of occurrence of elements.. Leaching of surface samples ...  Bentonites Comparison with other shales .. Major elements . Minor and trace elements Measured sections...-.-.  . . References cited   . Index  ... Page 20 20 22 23 23 24 24 26 30 30 31 34 37 37 37 37 38 39 45 49

Stratigraphy and composition of the Sharon Springs Member of the Pierre Shale in western Kansas