Cambrian(?), Middle Proterozoic, and Archean rocks penetrated in a borehole near Argenta, Beaverhead County, Montana, and some paleogeographic and structural implications /
Pearson, Robert Carl, 1926-
Cambrian(?), Middle Proterozoic, and Archean rocks penetrated in a borehole near Argenta, Beaverhead County, Montana, and some paleogeographic and structural implications / by Robert C. Pearson. - Washington, D.C. : U.S. Government Printing Office., 1996. - iii, 15 p. : ill., maps ; 28 cm. - Belt supergroup in the Highland Mountains and probable equivalent rocks in the Pioneer and Anaconda ranges, southwestern Montana ; B U.S. Geological Survey bulletin ; 2121 .
Includes bibliographical references (p. 14-15).
QE75 QE627.5.M9 / .B9 no. 2121-B
Cambrian(?), Middle Proterozoic, and Archean rocks penetrated in a borehole near Argenta, Beaverhead County, Montana, and some paleogeographic and structural implications / by Robert C. Pearson. - Washington, D.C. : U.S. Government Printing Office., 1996. - iii, 15 p. : ill., maps ; 28 cm. - Belt supergroup in the Highland Mountains and probable equivalent rocks in the Pioneer and Anaconda ranges, southwestern Montana ; B U.S. Geological Survey bulletin ; 2121 .
Includes bibliographical references (p. 14-15).
QE75 QE627.5.M9 / .B9 no. 2121-B