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AAPG Bulletin

Abstract


Volume: 18 (1934)

Issue: 8. (August)

First Page: 1010

Last Page: 1017

Title: Age of Jackfork and Stanley Formations of Ouachita Geosyncline, Arkansas and Oklahoma, as Indicated by Plants

Author(s): Previous HitDavidNext Hit White (2)

Abstract:

Notwithstanding the ties between the plant species from the Stanley and Jackfork formations and the lower Pottsville floras of the Appalachian trough, the writer was long disposed to regard the two named formations as of very late Mississippian age, largely on account of their close paleobotanical relations to the "Culm" floras of the Waldenburg and Ostrau series, then classed as Mississippian, in the Silesian region. The detailed study of all the available plant material, including an important collection by H. D. Miser of small fern fragments from the upper Stanley near Gillham, Arkansas, completed in 1932, shows that the upper Stanley flora is distinctly later than the flora of the Wedington sandstone member of the Fayetteville shale or than any other known Mississippi n flora in eastern North America.

Predominantly the flora is of lower Pottsville composition. Meanwhile, the Ostrau-Waldenburg series was, in 1927, transferred by the Heerlen Congress to the Pennsylvanian. The Jackfork-Stanley is paleobotanically older than the Coal-bearing shale (member in the Morrow group), which is middle Pottsville in age, being post-Lee and post-Raleigh in the Pottsville series of the Appalachian trough. The conclusion that the Jackfork and Stanley may be largely if not wholly equivalent in time to the lower part of the Morrow group finds support in the few plant fragments common to the Previous HitHaleTop sandstone.

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