Deltaic facies of the Hartshorne Sandstone in the Arkoma Basin, Arkansas-Oklahoma border
David W. Houseknecht, 1988. "Deltaic facies of the Hartshorne Sandstone in the Arkoma Basin, Arkansas-Oklahoma border", South-Central Section of the Geological Society of America, O. T. Hayward
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Sedimentary facies deposited in channel and interchannel positions within an actively prograding, river-dominated delta are illustrated at two localities near the Arkansas-Oklahoma border south of Fort Smith, Arkansas.
Locality 1 (94°17—20"W.; 35°11'41—N.; Greenwood, Arkansas, Quadrangle) is a distinctive, terraced roadcut on U.S. 71, approximately 12 mi (20 km) south of Fort Smith (Fig. 1). The Hartshorne Sandstone dips steeply north (nearly vertical) along the north limb of the Washburn anticline (Fig. 2).
Locality 2 (94°31—20W.; 35°10—30"N.; Spiro, Oklahoma, Quadrangle) is a roadcut on old Oklahoma 112, approximately 8 mi (12 km) west of Hackett, Arkansas (Fig. 1). The Hartshorne Sandstone dips 15° southward along the southern limb of the Backbone anticline (Fig. 2).