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Orellan

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Journal Article
Published: 01 March 2013
Journal of Paleontology (2013) 87 (2): 289–296.
... I forms anterior cingulid on lower molars; mesoconid on lower cheek teeth enlarged and positioned at center of talonid basin. Duchesnean (late middle Eocene, Bartonian) of Saskatchewan, Chadronian (late Eocene, Priabonian) of Montana, North Dakota, Nebraska, and Orellan (early Oligocene...
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Journal Article
Published: 01 November 1988
Journal of Paleontology (1988) 62 (6): 965–967.
Journal Article
Published: 01 November 1987
Journal of Paleontology (1987) 61 (6): 1247–1255.
Series: SEPM Special Publication, SEPM Special Publication
Published: 01 January 1995
DOI: 10.2110/pec.95.04.0305
EISBN: 9781565760912
... occurs within Chron C18n, and lies above an ash dated at about 40 Ma. The Duchesnean/Chadronian boundary lies within Chron C16n, about 37 Ma. Finally, the Wood Committee (1941) divided their concept of North American Oligocene sequence into three land mammal “ages”: the Chadronian, Orellan and Whitneyan...
Journal Article
Journal: GSA Bulletin
Published: 01 March 1970
GSA Bulletin (1970) 81 (3): 831–850.
...JASON A LILLEGRAVEN Abstract The Brule Formation at Slim Buttes, Harding County, South Dakota, is composed of 265 ft of Orellan (approximately medial Oligocene) and 175 ft of Whitneyan (approximately late Oligocene) claystone, siltstone, and sandstone beds. The formation is divided into eight...
Image
Table 1. Areas for occlusal surface enamel of Chadronian and <b>Orellan</b>  Lepto...
in > PALAIOS
Published: 01 October 2010
Table 1. Areas for occlusal surface enamel of Chadronian and Orellan Leptomeryx specimens.
Journal Article
Journal: PALAIOS
Published: 01 October 2010
PALAIOS (2010) 25 (10): 682–687.
...Table 1. Areas for occlusal surface enamel of Chadronian and Orellan Leptomeryx specimens. ...
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Series: GSA Special Papers
Published: 01 April 2009
DOI: 10.1130/2009.2452(13)
...., the middle Chadronian–late Chadronian boundary, 34.8 Ma) is located at ‒18 ± 2 m, and the first occurrence of the camel Poebrotherium wilsoni (34.2 Ma) is located at 0 ± 2 m. The first occurrences of two other artiodactyls (Hypertragulus calcaratus and Leptomeryx evansi), which define the Chadronian-Orellan...
Journal Article
Published: 01 August 1994
Canadian Journal of Earth Sciences (1994) 31 (8): 1335–1341.
... as characteristic of the early part of the Orellan Land Mammal Age (early Oligocene), and the typically Orellan Heliscomys hatcheri and Eumys elegans . Several other tara in the KSW assemblage are known from both the Chadronian (late Eocene) and Orellan. La faune de la Formation de Cypress Hills (Éocène à...
Journal Article
Published: 27 November 2014
Journal of the Geological Society (2015) 172 (2): 264–271.
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Journal Article
Journal: The Leading Edge
Published: 01 August 2014
The Leading Edge (2014) 33 (8): 890–902.
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Journal Article
Published: 01 February 2003
Geochemistry: Exploration, Environment, Analysis (2003) 3 (1): 29–38.
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Journal Article
Published: 01 June 1978
Journal of Sedimentary Research (1978) 48 (2): 433–451.
Journal Article
Journal: Geophysics
Published: 01 February 1966
Geophysics (1966) 31 (1): 192–203.
Journal Article
Journal: Geophysics
Published: 01 February 1963
Geophysics (1963) 28 (1): 99–110.
Journal Article
Published: 01 January 2021
Journal of Paleontology (2021) 95 (1): 193–204.
... the Oligocene (Orellan and Whitneyan) C . stevensoni (Cope, 1873b ). This study adds a third and fourth Whitneyan marsupial fauna from the Great Plains region of North America, increases the known diversity of Whitneyan marsupials, and provides further evidence that marsupial diversity during the late Paleogene...
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Journal Article
Published: 01 September 2013
Journal of Paleontology (2013) 87 (5): 930–933.
... their apparent Uintan extinction. We re-examined the specimen, and compared it to the large collection of recently described peccaries from the Chadronian ( Perchoerus minor ) and Orellan ( Perchoerus nanus ) and Bridgerian helohyids ( Helohyus sp. ) . Once the range of variation of characters in helohyids...
FIGURES
Journal Article
Journal: Geology
Published: 01 June 2004
Geology (2004) 32 (6): 497–500.
...Christine A. Metzger; Dennis O. Terry, Jr.; David E. Grandstaff Abstract The rare earth element (REE) content of fossil bones was analyzed and compared with the degree of ancient pedogenic development and depositional environments from several locations in the Orellan Scenic Member of the Oligocene...
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Figure 1. Qualitative occlusal surface observations. A) Left first lower mo...
in > PALAIOS
Published: 01 October 2010
Figure 1. Qualitative occlusal surface observations. A) Left first lower molar of Chadronian Leptomeryx (UF 191755). B) Left first lower molar of Orellan Leptomeryx (UF 207852) showing crenulations and Paleomeryx fold.