Depositional and deformational characteristics of the Atoka Formation, Arkoma Basin, and Ouachita frontal thrust belt, Oklahoma
David W. Houseknecht, Michael B. Underwood, 1988. "Depositional and deformational characteristics of the Atoka Formation, Arkoma Basin, and Ouachita frontal thrust belt, Oklahoma", South-Central Section of the Geological Society of America, O. T. Hayward
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Sedimentary facies and structure of the Atoka Formation of the Arkoma basin and Ouachita frontal thrust belt are illustrated by a north-south transect in LeFlore County, Oklahoma.
Locality 1 (94°29—32’W.; 35°12—30"N.; Hackett Quadrangle) is a roadcut on Oklahoma 112, 1.5 mi (2.4 km) south of the village of Pocola (Fig. 1). The Atoka Formation crops out along the Backbone anticline, which is the expression of a thrust fault that ramps to the surface just north of this exposure. The exposed strata are correlative with the ‘Alma’ sandstone of subsurface terminology; in this part of the basin, the Alma is located about 2,650 ft (800 m) below the top and 4,650 ft (1,400 m) above the base of the Atoka Formation. The strata dip 45° to the south.
Locality 2 (94°38—06’W.; 34°49—36’N.; Hodgen Quadrangle) is a roadcut on U.S. 270/59, 1.1 mi (1.8 km) south of the village of Hodgen (Fig. 1). This north-dipping Atoka section is exposed just south of the Choctaw thrust fault (south of the Choctaw fault, the Atoka has been renamed the Lynn Mountain Formation in certain recent publications).
Locality 3 (94°37—37’W.; 34°44—46—N.; Big Cedar Quadrangle) is a roadcut on U.S. 270/59 just south of the village of Stapp. These strata have traditionally been placed within the Johns Valley Shale (Seely, 1963; Hart, 1963), but recent mapping indicates that the turbidites and debris-flow deposits are simply one of several facies associations within the Lynn Mountain Formation (Poole, 1985; McDonald, 1986). The section is slightly overturned to the