Masters Theses


"In eastern Missouri, southeastern Iowa, and western Illinois - a transition zone, a body of rock consisting of several lithosomes which has a geographic extent measured in scores to hundreds of miles and which lies between a single overlying formation and a single underlying formation and which has lithologic and/or paleontologic properties common to both the overlying and the underlying formations, was found to exist between the St. Louis and the Ste. Genevieve formations. This transition zone is called the St. Louis-Ste. Genevieve Transition Zone, and is shown to possibly be due to continuous deposition between these two times and a transitional or alternating environment. It is believed that these conditions existed in Late Meramecian times in the study area alternating between a near-shore environment that deposited the Ste. Genevieve-like arenaceous oo- and biosparites and a far-shore environment that deposited the St. Louis-like lithographic to sublithographic micrites and biomicrites. The geographic extent of the depressed Transition Zone is postulated to range from just north of Ste. Genevieve, Missouri, northwestward into southeastern Iowa. The distribution is probably the result of a bird-foot delta to the northeast, the prevailing winds, and sediment-carrying currents that moved the sediments contributed by the major river system(s) that built-up such a delta. It is suggested that if the Transition Zone becomes recognized widely enough that it be given formal status and termed the Alton Member and assigned to the St. Louis Formation. A suggested type-locality in Alton, Illinois, is included"--Abstract, page ii.


Spreng, Alfred C., 1923-2012

Committee Member(s)

Kisvarsanyi, Geza
Govier, John P., 1913-1998


Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology


V. H. McNutt Memorial Foundation
National Defense and Education Act Title IV Fellowship


University of Missouri--Rolla

Publication Date



xi, 167 pages


© 1971 Donald Howerton Fielding, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Paleontology -- Mississippian
Geology, Stratigraphic

Thesis Number

T 2581

Print OCLC #


Electronic OCLC #


Included in

Geology Commons