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The AAPG/Datapages Combined Publications Database

CSPG Special Publications

Abstract


Intl. Symposium of the Devonian system: Papers, Volume II, 1967
Pages 679-691
Biostratigraphy

Lower Devonian faunal succession in Central Nevada

J. G. Johnson, A. J. Boucot, M. A. Murphy

Abstract

Devonian limestone sequences in central Nevada contain a richly fossiliferous succession of marine shelly faunas spanning the Ludlow to Eifelian interval. The successive brachiopod faunas display strong Old World affinities in the Ludlow to lower Siegenian, but faunas of Appalachian affinity reach a maximum and dominate in the higher Siegenian, only to disappear in favor of a fauna of Old World affinity again in the higher Emsian. Gedinnian to Emsian strata comprise six mutually distinctive faunal assemblages recognized principally on the basis of their contained brachiopods.

Because of peculiarities of North American palaeogeography and provinciality of the marine shelly megafauna, the central Nevada faunal sequence serves as an intermediate Lower Devonian standard that in large measure bridges the provinciality gap between the Appalachian Province and Old World Province faunas of the Canadian Arctic as well as the more distant Old World faunal successions.


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