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The AAPG/Datapages Combined Publications Database

Williston Basin Symposium

Abstract

SKGS-AAPG

Sixth International Williston Basin Symposium, October 7, 1991 (SP11)

Pages 207 - 215

STRATIGRAPHIC DISTRIBUTION OF TITANOIDES (MAMMALIA: PANTODONTA) IN THE FORT UNION GROUP (PALEOCENE) OF NORTH DAKOTA

JOSEPH H. HARTMAN, Energy and Environmental Research Center, University of North Dakota, Box 8213, University Station, Grand Forks, ND 58202, 701-777-2551
ALLEN J. KIHM, Minot State University, Department of Earth Sciences, Minot, ND 58701 701-857-3864

ABSTRACT

The type species of Titanoides, T. primaevus, is based upon a specimen discovered in 1913 northeast of Fort Union, near the Yellowstone-Missouri River confluence, in the upper Paleocene strata of the Fort Union Group in North Dakota. Although now known from numerous localities and represented by several species in the Rocky Mountain region, the stratigraphic and geographic context of the genoholotype has not yet been accurately reported. The relocation of the type locality of Titanoides primaevus and six other Titanoides occurrences in the state now allow these localities to be placed into both litho- and biostratigraphic context. The lowest record is the middle Tiffanian age (late Paleocene) Judson Locality, which is near the Slope-Bullion Creek formational contact, occurring about 79 ft (24 m) above the Cannonball Formation. The remaining localities are all in the lower portion (within 164 ft [50 m] of the base) of the Sentinel Butte Formation. The type locality, named the Witter Locality, is approximately 72 ft (21.9 m) above a recently discovered locality that has produced mammals of middle Tiffanian age. This may indicate that the Witter Locality is slightly younger than the Judson Locality, but both localities may also represent the same biochron. The purportedly youngest occurrence in the state is the Riverdale Locality, which was previously reported from the Tongue River Formation, but has since been reinterpreted as the Sentinel Butte Formation. The mammalian fauna from the Riverdale Locality is from a stratigraphically higher horizon than the Judson Locality, but is still middle Tiffanian. Although known from younger localities elsewhere (late Tiffanian and possibly early Clarkforkian, representing latest Paleocene), all of the known Titanoides localities in North Dakota are middle Tiffanian.

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