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Nonopaque Heavy Minerals in Sandstone of Jurassic and Cretaceous Age in the Black Hills, Wyoming and South Dakota
The following report describes the examinations of the nonopague heavy minerals in sandstone found in the Black Hills in northeastern Wyoming and western South Dakota. The studies were made to determine if differences in the shapes of the grains and proportions of minerals are sufficiently distinctive to be used in subdividing and correlating formations.
Date:
1964
Creator:
Mapel, W. J.; Chisholm, Wayne A. & Bergenback, Richard Edwards
System:
The UNT Digital Library
Geologic Reconnaissance of the Antelope-Ashwood Area North-central Oregon: With Emphasis on the John Day Formation of Late Oligocene and Early Miocene Age
From introduction: "This report briefly describes the geology of an area of about 750 square miles in Jefferson, Wasco, Crook, and Wheeler Counties, Oregon."
Date:
1964
Creator:
Peck, Dallas L.
System:
The UNT Digital Library