TY  - BOOK
ED  - United States
TI  - Composition and properties of the Pierre Shale and equivalent rocks, northern Great Plains region: mineralogical and chemical study, including trace elements, of marine and nonmarine rocks of late Cretaceous age 
T2  - Geological Survey professional paper
U1  - 551.77 
PY  - 1980///
CY  - Washington, D.C.
PB  - United States Geological Survey
KW  - Geology, Stratigraphic
KW  - Cretaceous
KW  - Shale
KW  - Great Plains
N1  - Includes index; Bibliography: p. 82-84
ER  -