Contrasts in Style of American Thrust Belts: Alabama, by William A. Thomas, George W. Viele, Lucian B. Platt,

By William A. Thomas, George W. Viele, Lucian B. Platt, Christopher J. Schmidt

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Published by way of the yank Geophysical Union as a part of the Field journey Guidebooks Series.

Fold-thrust belts have many attributes in universal, yet a number of the vital attributes range enormously. the aim of this box journey is to ascertain the variety of version of numerous very important attributes of fold-thrust belts, together with (1) the tectonic environment of deposition of the allochthonous sedimentary rocks, (2) the presence or absence of crystalline basement rocks within the allochthon, (3) the stratigraphic point of the basal decollement, (4) the geometry and inner constitution of thrust sheets, and (5) the results of basement buildings underneath the allochthon at the geometry and kinematics of the fold-thrust belt. 4 areas in North American fold-thrust belts (Fig. 1-1) are visited in this box journey to ascertain the diversity of version within the indexed attributes. The 4 areas are (1) the Alabama Appalachians (the southernmost exposures of the Appalachian orogen), (2) the Ouachitas (exposures within the Ouachita Mountains in Arkansas and Oklahoma), (3) the Idaho-Wyoming Rockies (exposures of the Cordilleran fold-thrust belt), and (4) the Montana Rockies (exposures of the frontal a part of the Cordilleran fold-thrust belt and basement constructions of the Rocky Mountain foreland).

Chapter 1 evaluation of the sphere journey (pages 1–4): William A. Thomas, George W. Viele, Lucian B. Platt and Christopher J. Schmidt
Chapter 2 The Appalachian Fold?Thrust Belt in Alabama (pages 5–35): William A. Thomas
Chapter three The Ouachita Orogenic Belt in Arkansas and Oklahoma (pages 37–63): George W. Viele
Chapter four Idaho?Wyoming Thrust Belt (pages 65–81): Lucian B. Platt
Chapter five The Frontal Thrust Belt in Montana (pages 83–112): Christopher J. Schmidt

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Extra info for Contrasts in Style of American Thrust Belts: Alabama, Arkansas-Oklahoma, Wyoming-Idaho, Montana, July 20-31, 1989

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This tier of thrust slices ends southwestward along strike a short distance southwest of this traverse; Stop 11-13. Coosa deformed belt and Pell City fault. individual thrust faults end in southwest-plunging anticlines. The stratigraphic section in these thrust slices William A. Thomas includes Ordovician Newala Limestone (upper part of Knox Group), Mississippian Fort Payne Chert, Floyd . Shale, and Parkwood Fonnation. The unconfonnity In a traverse of -10 km along U. S. Highway 280, between Fort Payne and the Ordovician limestone the route crosses the southwestern part of the Coosa defonned belt, a north-trending segment of the Pell City reflects the southeastward increase in hiatus and merger of the regional unconfonnities within the Paleozoic thrust fault, and north-northwest-trending folds in the succession (Fig.

S. thesis]: Tuscaloosa, University of Alabama, 178 p. Ferrill, B. , and Thomas, W. , 1988, Acadian dextral transpression and synorogenic sedimentary successions in the Appalachians: Geology, v. 16, p. 604-608. Gibson, A. , 1893, Report on the geological structure of Murphree's Valley, and its minerals and other materials of economic value: Alabama Geological Survey [Special Report 4], 132 p. Horsey, C. , 1981, Depositional environments of the Pennsylvanian Pottsville Formation in the Black Warrior basin of Alabama: Journal of Sedimentary Petrology, v.

I for erosion of the upthrown blocks. Sedimentation was rapid, and consequently, the fault scarps never had high physiographic relief. Syndepositional faulting started in the eastern end of the Arkoma basin and migrated westward and northward in space and time. As the faulting migrated, the deep-water facies migrated with it becoming younger to the west and north. Upper Pennsylvanian (Desmoinesian) shallow-water sandstones form the youngest strata within the Arkoma basin (Figure 2). They thicken gradually toward the south, across high-angle faults that were no longer active.

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