1963
Article
Oklahoma Geological Survey Bulletin 94:8-140
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<p>Part I. The Frisco is a Lower Devonian formation which crops out in the Arbuckle Mountains region of south-central Oklahoma and in a small area of Sequoyah County in northeastern Oklahoma. It is largely a bioclastic calcarenite with a substantial megafauna, predominantly brachiopods and snails, but with some bryozoans, corals, trilobites and pelecypods; locally the strata grde into a pelmatozoan limestone although complete calyces are few. The shells and other skeletal elements were subjected to considerable move ment by wave and/ or current action, either before or during deposition, resulting in fragmentation and extensive disarticulation of the shells. The brachiopods are represented largely by disarticulated valves, and for most species there are far more pedicle valves than brachia! valves; this disparity between the numbers of opposing valves is interpreted as the resut of more extensive fragmentation of the thinner, weaker valves during deposition. Thirty-two articulate brachiopod species ( one new) assigned to 29 genera are described in th.e present report. This fauna is assigned a Deerparkian age and shows a marked similarity to the brachiopod fauna of the Oriskany For mation of the eastern United States, the Grande Greve Formation of Quebec, the Little Saline Formation of southeastern Missouri and southwestern Illinois, and the Harriman Formation of western Tennessee.</p> <p>Part II. The Sallisaw is a late Early Devonian formation which crops out in a small area of Sequoyah County in northeastern Oklahoma. It is pre dominantly arenaceous limestone and dolomitic limestone with an insoluble content, mostly fine quartz sand, which averages about 9.5 percent; nodules and lenses of chert are common and locally the entire formation grades into bedded chert. The megafauna consists almost entirely of brachiopods, most of which occur as disarticulated and somewhat fragmentary free pedicle and brachia! valves; some of the chert beds carry well-preserved specimens in the form of external and internal molds. Eleven articulate brachiopod species ( one new) are described in this report. This fauna is believed to represent a late Esopusian age, with similarities to the brachiopod fauna from the Woodbury Creek Member of the Esopus Formation in New York. The Sallisaw fauna has a marked resemblance to the brachiopod faunas from the Clear Creek Formation of southwestern Illinois and the Camden Formation of western Tennessee. It is also similar to the fauna of the Littleton Forma tion of New Hampshire.</p> <p>Part III. The Haragan is a Lower Devonian ( Helderbergian ) forma tion which crops out in the Arbuckle Mountains region of south-central Oklahoma. The articulate brachiopod fauna from this formation has been described in an earlier publication ( Amsden, 1958a ) , which also includes a discussion of its age and correlatives. The present report adds four addi tional species ( one new ) to this Haragan fauna. Two of these species, Anoplio psis pygmaea Amsden and Spino plasia gaspensis? Boucot, are of particular interest because they expand the known stratigraphic and geo graphic range of the Paeckelmanniinae and Ambocoeliininae.</p>