U. S. Geological Survey Maps:
No. 1-447 Geologic Map of the Canyon City quadrangle, northeastern
Oregon, by C. Ervin Brown and T. P. Thayer, 1966. The map
covers the entire region at a scale of one inch equals 4
miles.
GQ-438 Geologic Map of the Aldrich Mountain quadrangle, Oreg., (with
text) by T. P. Thayer and C. Ervin Brown, 1966.
GQ-548 Geologic Map of the Mount Vernon quadrangle, Oreg., (with text)
by C. Ervin Brown and T. P. Thayer, 1966.
MF-51 Preliminary Geologic Map of the John Day quadrangle, Oreg., by
T. P. Thayer, 1956.
U. S. Geological Survey Professional Papers:
No. 550-C Local thickening of basalts and silicic volcanism in the
Canyon City quadrangle, Oreg., by T. P. Thayer and C. E.
Brown, pages C73-C78, 1966.
_(From material provided by Thomas P. Thayer)_
[Illustration: ]
As the Nation’s principal conservation agency, the Department of the
Interior has basic responsibilities for water, fish, wildlife, mineral,
land, park, and recreational resources. Indian and Territorial affairs
are other major concerns of America’s “Department of Natural Resources.”
The Department works to assure the wisest choice in managing all our
resources so each will make its full contribution to a better United
States—now and in the future.