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Morrison formation 
1. Mudstone marl, mudstone greenish gray* marl 
pale light gray, muds tone contains very fine 
sand grains: marl as discontinuous beds up to 
3 1 thick* 
Unkpapa sandstone (in part) 
1 * Sandstone , white to pale light gray, wry 
fine grained to silt, cross-bedded, friable* 
