Masters Theses

Abstract

"The Maquoketa Formation (Upper Ordovician-Cincinnatian Series) has been extensively studied for over one hundred years, but a petrographic study of its cyclic lithologies has been neglected. The following six distinct Maquoketa lithologies have been recognized in this study in Pike County, Missouri: 1) phosphatic biosparite, 2) phosphorite, 3) micrite-microsparite, 4) dolomitic shale, 5) dolomitic marlstone, and 6) dolomitic quartz siltstone. Three cycle types are present in the Maquoketa. They are expressed as thin beds (1-20 inches) of alternating micrite-shale, micrite-marlstone, and shale-siltstone. Contacts between different lithologies are sharp, indicating a primary sedimentological origin for the cycles. Precisely what mechanism was responsible for these rapid and repetitive changes in sedimentation is undetermined. All Maquoketa sediments have experienced extensive diagenesis, the most widespread of which were dolomitization, neomorphism of calcium carbonate and formation of syngenetic pyrite. Minor development of authigenic silica, fluorite, and sphalerite were found in selected examples. The formation of sedimentary boudinages, cone-in-cone structures, and minor intrastratal folds is interpreted as having taken place in some micritic sediments before consolidation was completed"--Abstract, page ii.

Advisor(s)

Spreng, Alfred C., 1923-2012

Committee Member(s)

Grant, S. Kerry
[illegible signature]

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology

Sponsor(s)

V. H. McNutt Memorial Foundation

Publisher

University of Missouri--Rolla

Publication Date

1970

Pagination

xi, 220 pages

Note about bibliography

Includes bibliographical references (pages 209-219).

Geographic Coverage

Missouri
Maquoketa Group (Mo.)

Rights

© 1970 Edwin Carl Kettenbrink, Jr., All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Geology -- Missouri
Geology, Stratigraphic -- Ordovician
Petrology -- Missouri
Diagenesis -- Missouri

Thesis Number

T 2532

Print OCLC #

6032959

Electronic OCLC #

874037963

Included in

Geology Commons

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