Masters Theses


"Purpose and Scope. — The Phosphoria formation of the northern Rocky Mountains of the United States has received considerable attention from geologists because of its important reserves of phosphate and petroleum. In the Big Horn Basin of Wyoming, however, still more work is needed to compile the information necessary for a complete understanding of the facies changes exhibited by this formation.

The purpose of this paper is two-fold: first to present a description of the lithology and the paleontology of the Phosphoria formation in the northeast part of the Big Horn Basin, and secondly to show the stratigraphic relationship of the facies present in the outcrop sections to each other and to those in adjacent areas. The author hopes this study will aid in the understanding of the complex Permo-Triassic problems existing in this region.

Procedure of Study. — During the summer of 1956, a general survey of the thesis area was made after which ten outcrops were selected to be studied in detail. The lithologic units of these exposures were described in detail and sampled. The thicknesses were measured by the author and his field assistant with a 100 foot tape and a hand level. After returning to the campus of the Missouri School of Mines and Metallurgy, the samples were examined under the binocular microscope for their major mineral constituents, and tested for the presence of phosphate.

The phosphate test used was devised by Oakes (1938, pp. 454-457). Thin sections were prepared from selected samples for petrographic study. The literature applicable to the problem was reviewed. The information thus obtained was incorporated into this paper during the scholastic year of 1956-57."--Introduction, pages 1-2.


Spreng, Alfred C., 1923-2012


Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology


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Missouri School of Mines and Metallurgy

Publication Date



iv, 66 pages

Note about bibliography

Includes bibliographical references (pages 64-66).


© 1957 William A. Beatty, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Geology -- Phosphoria Formation
Geology, Stratigraphic -- Permian
Geology, Stratigraphic -- Triassic
Petrology -- Wyoming
Paleontology -- Wyoming

Thesis Number

T 1187

Print OCLC #


Electronic OCLC #


Included in

Geology Commons


Thesis Location