Low-angle overthrust faulting, as illustrated by the Cumberland Plateau-Sequatchie Valley fault system

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ID: 297051
1963
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Abstract
Detailed geologic mapping of the Sequatchie Valley fault, Sequatchie Valley, Tennessee, has indicated that the Sequatchie Valley fault dips to the SE. at a low angle in the northern part of the valley, at a moderate angle in the central portion, and at a low angle in the southern portion of the area mapped, near the Tennessee-Alabama state line. The evidence for a low angle of dip is the irregular trace of the fault and klippen immediately in front of the overthrust in the northern and southern portion of the valley. The trace of the Sequatchie Valley fault is straighter and klippen are absent in the central section. In the northern and southern sections, Ordovician to Mississippian formations are thrust over Mississippian shales; in the central section, the foot wall formation is composed of massive limestone. Thus, the lithology of the foot wall is apparently the factor which governs the attitude of the fault surface. The Cumberland Plateau overthrust and Sequatchie Valley fault are genetically related. This is shown by by: 1) the fault pattern at the northern end of Sequatchie anticline, 2) the cross-sectional symmetry of the northern portion of Sequatchie anticline, and 3) drill hole data. The Cumberland Plateau overthrust, therefore, does not arch over Sequatchie anticline as a bedding thrust within Mississippian and Pennsylvanian formations, and Sequatchie Valley, Grassy Cove, and Crab Orchard Cove are not windows.
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Authors Robert C. Milici
Journal american journal of science
Year 1963
DOI
10.2475/ajs.261.9.815
URL
https://ajs.scholasticahq.com/article/59018.pdf
Keywords Keywords not found

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