Paleoecology of an Early Oligocene Biota from Douglass Creek Basin, Montana

Konizeski, Richard L.

doi:10.1130/0016-7606(1961)72[1633:poaeob]2.0.co;2

Cited by 5 publications

(5 citation statements)

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“…The three known specimens show less variation in all characters than do the hypodigms of P. (S.) gilpini and P. (S.) dakotensis. F-PM 3843 is one of two specimens listed by Konizeski (1961) as Hesperocyon paterculus; the other on his list, F-PM 3828, is certainly Hesperocyon.…”

mentioning

confidence: 99%

Arctoid genetic characters as related to the genus Parictis

Clark¹,

Guensburg²,

Williams³

1972

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mentioning

confidence: 99%

Arctoid genetic characters as related to the genus Parictis

Clark¹,

Guensburg²,

Williams³

1972

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“…We follow Clark and Guensburg in provisionally including FMNH PM 3843 within the hypodigm, although we have not seen it in person. This latter specimen was referred to Hesperocyon paterculus by Konizeski (1961).…”

Section: Subparictis Montanusmentioning

confidence: 99%

“…Hesperocyon paterculus (Matthew):Konizeski, 1961:1640. Parictis (Subparictis) montanusClark and Guensburg, 1972:16.…”

mentioning

confidence: 99%

An exquisitely preserved skeleton of Eoarctos vorax (nov. gen. et sp.) from Fitterer Ranch, North Dakota (early Oligocene) and systematics and phylogeny of North American early arctoids (Carnivora, Caniformia)

Wang

Emry

Boyd

et al. 2022

Journal of Vertebrate Paleontology

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An exquisitely preserved male skeleton of an early arctoid, Eoarctos vorax new genus and species, provides a unique window into the origin and early divergence of Carnivora. Recovered from the Fitterer Ranch locality in the early Oligocene (Orellan to Whitneyan North American Land Mammal ages) Brule Formation of southwestern North Dakota (∼32 Ma), the new arctoid offers an opportunity to evaluate the fundamental relationships of the caniform (dog-like) carnivorans. Eoarctos vorax possesses a suite of plesiomorphic characters inherited from its miacid ancestors, making it an ideal model for ancestral arctoids. We present a comprehensive treatment of E. vorax, combining traditional description with photographic documentation, microCT, laser scans, and photogrammetry. Showing its plesiomorphic morphology, Eoarctos vorax is scansorial, somewhat like a modern raccoon, retaining the ability to climb trees and lacking cursorial adaptations present in the early canid Hesperocyon. However, E. vorax shows clear signs of durophagous cranio-dental morphology, presumably for an obligatory diet of mollusks, with frequent damage to shell-crushing premolars, plus associated dental infections. We review several other key North American early arctoids and present total-evidence (nuclear DNA and discrete morphological characters) Bayesian and parsimony analyses of Caniformia phylogeny, including extinct stem taxa plus a living member of all modern families. We recognize an endemic North American ursoid clade, Subparictidae, which includes Eoarctos vorax. We demonstrate the importance of North America as an early cradle of evolution for caniform carnivorans, including early precursors of Canidae, Amphicyonidae, Ursidae, and Pinnipedia. http://zoobank.org/urn:lsid:zoobank.org:pub:86C85C7A-9DDF-410E-ACA6-F5B913093E2D SUPPLEMENTARY FILES-Supplementary files are available for this article for free at www.tandfonline.com/UJVP.

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“…not occur in the study area and most likely does not exist at all, and (2) much of the extensional slip attributed to the Basin-andRange tectonic event in the Elliston area during Oligocene and Miocene time (Pardee, 1950;Reynolds, 1979;McMurtrey and others, 1965;Konizeski, 1965;and Csejtey, 1963) is probably Late Cretaceous to pre-middle Eocene in age. This tensional tectonic event could be related to Late Cretaceous slip on faults of the Lewis and Clark line (Wallace and others, 1990) or to an Eocene tensional tectonic event described in northern Washington and Idaho (Fox and Rinehart, 1988;Rhodes and others, 1989).…”

Section: Regional Stratigraphic and Structural Implicationsmentioning

confidence: 99%

“…Previous reports have emphasized the role of Oligocene and younger Basin-anq-Range faulting as the principal factor in forming the present ranges and valleys (Pardee, 1950;Konizeski, 1957Konizeski, , 1965McMurtrey and others, 1965;Csejtey, 1963;Rasmussen, 1969Rasmussen, , 1977Reynolds, 1979;Fields and others, 1985;Loen, 1986), but interpretations of our data from this study and from the adjoining region suggest that part of the slip on normal faults is Late Cretaceous in age (Wallace and others, 1990) and that the principal ranges and valleys in this region predate volcanic rocks of middle Eocene age. Late Oligocene and Miocene slip on normal faults may have been only one of several Late Cretaceous and Tertiary tensional tectonic overprints that shaped the present system of ranges and valleys.…”

Section: Tensional Tectonic Regimesmentioning

confidence: 99%