"Detailed geologic mapping of the Cotter-Jefferson City formational contact in the Thayer, Missouri area demonstrates the feasibility of using this contact. This mapping also delineates significant faulting in the area.
The stratigraphy of the Cotter and Jefferson City formations in the Thayer area has been studied to find a mappable contact between the two formations. The contact was mapped in this area by using marker beds, the stratigraphic positions of which were determined by applying insoluble residue techniques to outcrop sections. Because the insoluble residue zones of the Cotter and Jefferson City formations are recognizable throughout the state of Missouri in the subsurface, mapping the contact between the formations should be possible anywhere within their outcrop area by applying the method described in this report.
Mapping has revealed three distinct zones of block faulting with vertical displacements as great as 350 feet. The faults were mapped using a combination of structural control and air-photo lineations, because the fault traces cannot usually be seen in the field. The faulting may be a southeastward extension of the Graydon Springs fault zone, or it may be part of a suspected east-west trending fault zone of regional extent. Mammoth Spring, the second largest spring in the Ozarks, rises along a fault surface and near the intersection of two fault zones"--Abstract, page ii.
Beveridge, Thomas R. (Thomas Robinson), 1918-1978
Rockaway, John D.
Carroll, William R.
Geosciences and Geological and Petroleum Engineering
M.S. in Geology
V. H. McNutt Memorial Foundation
University of Missouri--Rolla
vii, 159 pages, 14 plates
© 1968 William Jesse Hedden, All rights reserved.
Thesis - Open Access
Geology -- Missouri -- Thayer area
Geology -- Missouri -- Maps
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Hedden, William Jesse, "The geology of the Thayer area emphasizing the stratigraphy of the Cotter and the Jefferson City formations" (1968). Masters Theses. 7092.
Gunther Hollow section
Hedden_William_1968_Plate_VII.tif (101487 kB)
Thayer composite section
Hedden_William_1968_Plate_VIII.tif (51284 kB)
Dam 3 section
Hedden_William_1968_Plate_IX.tif (59173 kB)
Bayou Access section
Hedden_William_1968_Plate_X.tif (53343 kB)
Many Islands section
Hedden_William_1968_Plate_XI.tif (60971 kB)
Biggers Bluff section
Hedden_William_1968_Plate_XII.tif (57152 kB)
Warm Fork Spring section
Hedden_William_1968_Plate_XIII.tif (22658 kB)
Log strip sections with correlations
Hedden_William_1968_Plate_XIV.tif (94088 kB)
Insoluble residue zones of the pre-St. Peter of Missouri (by Earl McCracken)