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Assessment of undiscovered oil and gas resources of the Ordovician Utica Shale of the Appalachian Ba

[Reston, Va.] : U. S. Department of the Interior, U.S. Geological Survey, 2012. 2012

Composition, clay mineralogy, and diagenesis of the Simpson Group (Middle Ordovician), Grady County,

Pollastro, Richard M.
[Reston, Va.?] : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : For sale by the Books and Open-File Reports Section, 1991. 1991

The correlation of rocks of Simpson age in north-central Kansas with the St. Peter Sandstone and ass

Leatherock, Constance, 1898-1965.
[Lawrence] : State Geological Survey of Kansas, 1945. 1945

Petrology and depositional facies of siliciclastic rocks of the Middle Ordovician Simpson Group, Maz

Flores, Romeo M.
[Reston, Va.?] : Dept. of the Interior, U.S. Geological Survey ; Denver, CO : For sale by the Books and Open-File Reports Section, 1989 [i.e. 1990] 1990

The Quimby and Greenvale Cove Formations in western Maine

Moench, Robert Hadley, 1926- author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1969. 1969

Stratigraphic nomenclature of Cambrian and Lower Ordovician rocks of easternmost southern Arizona an

Hayes, Philip Thayer, 1923- author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1972. 1972

Strodes Creek Member (Upper Ordovician)--a new map unit in the Lexington Limestone of north-central

Black, Douglas F. B., author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1973. 1973