Translator Disclaimer
1 May 2012 Pennsylvanian (Atokan) Ammonoids from the Magoffin Member of the Four Corners Formation, Eastern Kentucky
Author Affiliations +
Abstract

The Pennsylvanian ammonoids Gastrioceras magoffinense n. sp., Maximites nassichuki n. sp., Dimorphoceratoides adamsi n. sp., Bisatoceras? sp., Phaneroceras chesnuti n. sp., and Christioceratidae gen. indet. occur in the Magoffin Member of the Four Corners Formation in eastern Kentucky. The interval represented by the Magoffin ammonoid fauna should be known as the Gastrioceras magoffinense Assemblage Zone. This overlies the well-known Diaboloceras neumeieri Zone, represented in the Kendrick Shale Member of the Hyden Formation in eastern Kentucky. The Gastrioceras magoffinense Zone correlates to the Diaboloceras varicostatum–Winslowoceras henbesti Zone in the Winslow Member of the Atoka Formation in northwestern Arkansas. Ammonoids and associated conodonts, including Declinognathodus marginodosus and its descendant D. donetzianus, indicate an early Atokan age corresponding to the basal Bolsovian (basal Westphalian C) Substage in western Europe and the Bashkirian–Moscovian Stage boundary interval in eastern Europe and the South Urals.

The Paleontological Society
David M. Work, Charles E. Mason, and Darwin R. Boardman "Pennsylvanian (Atokan) Ammonoids from the Magoffin Member of the Four Corners Formation, Eastern Kentucky," Journal of Paleontology 86(3), 403-416, (1 May 2012). https://doi.org/10.1666/11-039.1
Accepted: 1 November 2011; Published: 1 May 2012
JOURNAL ARTICLE
14 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top