Paleogeography and conodont biostratigraphy of Devonian carbonate rocks of the Whitefish MacDonald Range, NW Montana and SE British Columbia

Conference · Fri Feb 01 00:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5171018

Seward, W P; Bush, J H ^[1]

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1. Univ. of Idaho, Moscow (United States)

Five remote Upper Devonian carbonate sections measured within the Rocky Mountain fold and thrust belt of the Whitefish Range, northwestern Montana and contiguous MacDonald Range, southeastern British Columbia are bounded unconformably at the base by Middle Cambrian carbonate rocks and unconformably at the top by the Devonian-Mississippian Exshaw Formation. Conodont zonation provides an age of late Frasnian to middle Famennian. Standard pelagic conodont zones represented are Polygnathus asymmetricus, Ancyrognathus triangularis, Palmatolepis gigas, Pa. triangularis, Pa. crepida, P. rhomboidea, and lower Pa. marginifera zones. Strata are equivalent in age to the Jefferson and Three Forks formations in central Montana, the Jefferson Formation in east central Idaho, carbonate units of Limestone Hill in eastern Washington, the Devils Gate Limestone and pilot Shale in eastern Nevada, and the Fairholme Group, Alexo, and Palliser formations in British Columbia. Devonian carbonate lithologies examined in this study are dominantly subtidal and intertidal lime mudstone, wackestone, and bindstone interpreted to have been deposited above storm wave base on a wide carbonate platform, during the early, less dramatic movements of the Antler orogeny. This research will provide a data point that will fill a significant void in Devonian paleogeographic information in the northern United States and Southern Canadian cordillera.

• OSTI ID: 5171018
• Report Number(s): CONF-9103128-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:2; Conference: American Association of Petroleum Geologists (AAPG)/Society of Economics, Paleontolgists, and Mineralogists (SEPM)/Society of Exploration Geophysicists (SEG)/Society of Professional Well Log Analysts (SPWLA) Pacific Section annual meeting, Bakersfield, CA (United States), 6-8 Mar 1991; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
BRITISH COLUMBIA
GEOLOGIC FORMATIONS
PALEONTOLOGY
STRATIGRAPHY
MONTANA
ANNELIDS
CARBONATE ROCKS
DEPOSITION
DEVONIAN PERIOD
FOSSILS
ANIMALS
CANADA
DEVELOPED COUNTRIES
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGY
INVERTEBRATES
NORTH AMERICA
PALEOZOIC ERA
ROCKS
SEDIMENTARY ROCKS
USA
580000* - Geosciences