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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 28 (1944)

Issue: 11. (November)

First Page: 1626

Last Page: 1634

Title: Moorefield Formation and Ruddell Shale, Batesville District, Arkansas

Author(s): Mackenzie Gordon, Jr. (2)

Abstract:

The Moorefield formation in the Batesville district, Independence County, Arkansas, consists of a lower member of black calcareous shale and limestone and an upper member of dark gray fissile clay shale. The lower member has been known as the Spring Creek limestone (name preoccupied) and grades laterally into chert that has been mapped incorrectly as Boone chert. It is recommended that the name Moorefield formation be restricted to the lower member, and that the name Ruddell shale be erected for the upper member. The fossil assemblages indicate that the Moorefield formation (restricted) represents the British P1 (G1) or Goniatites crenistria zone and the Ruddell shale together with the overlying Batesville sandstone, the P2 (G2) or Goniatites striatus zone of the upper Visean stage of the European Carboniferous section. The Moorefield formation (restricted) is correlated tentatively with the St. Louis limestone and the Ruddell shale with the Ste. Genevieve limestone of the central Mississippi Valley section.

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