lower Wasatchian

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Journal Article
Journal: GSA Bulletin
Published: 01 February 2000
GSA Bulletin (2000) 112 (2): 292–307.
... investigation of the Paleocene-Eocene climatic transition. Intensive sampling has resulted in the recovery of an estimated 189 species of plant macrofossils from the Tiffanian, Clarkforkian, Wasatchian, and Bridgerian land mammal “ages.” The leaf morphologies and taxonomic affinities of these fossils were used...
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Journal Article
Journal: GSA Bulletin
Published: 01 January 1952
GSA Bulletin (1952) 63 (1): 59–94.
...JOHN A DORR, JR. Abstract Several episodes of Laramide deformation occurred in ranges bordering the Hoback Basin. Deformation, beginning in the west, provided sediment for the Hoback formation. The Hoback formation was overriden by post-Wasatchian thrusting. The middle Eocene? Pass Peak...
Journal Article
Journal: GSA Bulletin
Published: 01 December 1981
GSA Bulletin (1981) 92 (12_Part_II): 1982–2267.
... basins (Figs. 13, 14; Table 12). In the San Juan basin of New Mexico and Colorado, the Puerean to Wasatchian (lower Eocene) sedimentary sequence includes the type localities for the Puerean, Torrejonian (middle Paleocene), and Tiffanian (late Paleocene) land mammal “ages” (Wood and others, 1941) as well...
Journal Article
Published: 19 June 2004
Canadian Journal of Earth Sciences (2004) 41 (6): 757–763.
...Kenneth D. Rose; Jaelyn J. Eberle; Malcolm C. McKenna Abstract A new genus and species of palaeanodont, Arcticanodon dawsonae , is based on a single lower jaw fragment from lower Eocene (Wasatchian) strata of the Margaret Formation, Eureka Sound Group, on central Ellesmere Island, Nunavut. The new...
Journal Article
Published: 01 March 1998
Rocky Mountain Geology (1998) 32 (2): 187–190.
...Peter Robinson; Donald G. Kron Abstract Koniaryctes paulus is a very small apternodontid insectivore. It differs from Parapternodus in having: (1) lower molars with more rounded buccal sides of the protoconids; and (2) by having a wider talonid, with no heel cusp. Molar paraconids project forward...
Series: GSA Special Papers
Published: 01 January 1990
DOI: 10.1130/SPE243-p211
... a nominally early Oligocene level (Chadronian) in the Kishenehn Formation of northern Montana. Ekgmowechashala is known from lower dentitions from the early Arikareean Sharps Formation of South Dakota and probably from an upper dentition reported from middle Arikareean rocks in the John Day Formation...
Journal Article
Published: 03 November 2015
Journal of Paleontology (2015) 89 (4): 665–694.
... no ectoflexus and slightly wider anterior stylar shelf; lower molars with less transverse paraconids. Biochrons Wa2 – Wa4, Willwood Formation, Bighorn Basin, Wyoming; Early Wasatchian of the Powder River Basin, Wyoming. Palaeosinopa lutreola is significantly smaller than P...
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Journal Article
Published: 09 January 2015
Canadian Journal of Earth Sciences (2015) 52 (2): 123–133.
..., stratigraphically distinct fossil assemblages — a late Wasatchian-aged lower assemblage and a Bridgerian-aged upper assemblage that were previously hypothesized by others based on faunal differences — that are separated by a 478 m thick stratigraphic gap that appears to lack fossil vertebrates. From...
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Journal Article
Journal: GSA Bulletin
Published: 01 May 2003
GSA Bulletin (2003) 115 (5): 549–565.
... Ar/ 39 Ar-based age model indicates that sediment accumulated three times more rapidly (327 ± 86 μm/yr) during the evaporative Wilkins Peak phase than the freshwater to saline Tipton (88 ± 34 μm/yr) and Laney (104 ± 18 μm/yr) phases. The much lower accumulation rates for the Tipton and Laney Members...
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Series: SEPM Special Publication, SEPM Special Publication
Published: 01 January 1995
DOI: 10.2110/pec.95.04.0335
EISBN: 9781565760912
... the Cenozoic Era in North America. All are important for evaluating the dispersal pattern, as well as for mammal age boundary definition. For the Paleogene interval, major immigration/emigration episodes define the following mammal ages (or intervals): Clarkforkian, Wasatchian, late Uintan, and Chadronian...
Series: GSA Memoirs
Published: 01 January 1977
DOI: 10.1130/MEM150-p1
... erosional remnants in which it still persists is 55 m (180 ft). Lithologically the formation is divisible into two members: a lower unit, from 1.5 to 20 m (5 to 65 ft) thick, of light gray or brightly colored kaolinitic strata herein designated the Bear Den Member and an upper unit, as much as 45 m (150 ft...
Journal Article
Journal: PALAIOS
Published: 01 June 2008
PALAIOS (2008) 23 (6): 380–390.
...Aaron R. Wood; Mary J. Kraus; Philip D. Gingerich Abstract Downslope fossil contamination is the result of erosion and subsequent redeposition of fossil material onto lower stratigraphic horizons. This produces time-averaged and potentially anomalous faunal records. Here, we describe vertebrate...
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Journal Article
Published: 01 January 2008
Journal of Paleontology (2008) 82 (1): 154–162.
...- and metaconids), and paraconids that are vertically inclined and subequal in overall size to the metaconid rather than anteriorly inclined, lower and significantly smaller than the metaconid as is found in the early Wasatchian taxa. These differences in morphology between the North American taxa and the Asian...
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Series: Contributions to Geology Special Paper 3, Contributions to Geology Special Paper 3
Published: 01 January 1986
DOI: 10.2113/gsrocky.24.special_paper_3.197
EISBN: 9780989762625
...., Lophiparamys debequensis, Paramys copei, Paramys excavatus, Mattimys kalicola , and two new species (Apatosciuravus jacobsi and Knightomys cf. K. minor). Microparamys reginensis has been placed in the genus Knightomys based on discovery of the upper dentition and additional specimens of lower dentition...
Journal Article
Journal: GSA Bulletin
Published: 01 February 1944
GSA Bulletin (1944) 55 (2): 165–210.
... sediments were deposited in a forested lowland, under warm-temperate conditions. Sinking of the structural basin was slower than Willwood deposition for upper Willwood deposits spread laterally beyond the lower part of the formation. Pre-Cambrian pebbles in both Polecat Bench and Willwood conglomerates...
Journal Article
Published: 01 November 2018
Rocky Mountain Geology (2018) 53 (2): 113–127.
.... Mammalian taxa include the marsupials Peradectes sp., cf. P. chesteri, and cf. Peratherium sp.; indeterminant insectivores; and the rodents Knightomys reginensis and K. minor. The rodents indicate an early Eocene age (Wasatchian North American Land Mammal Age), and the marsupials are consistent...
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Journal Article
Published: 01 November 2008
Journal of Paleontology (2008) 82 (6): 1074–1113.
... Bighorn Basin, Wyoming (Wasatchian, Willwood Formation). In addition to documenting numerous previously unpublished specimens of known taxa (including deciduous teeth), we also describe a new species, Phenacolemur willwoodensis n. sp., from the upper part of the Willwood Formation (Wa 5 and 6). The new...
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Journal Article
Published: 01 December 2020
Rocky Mountain Geology (2020) 55 (2): 91–129.
... zircon-based U–Pb depositional date (54.42 ± 0.27 Ma) came from this study that matched early Wasatchian time. Participants in the Dechesne et al. ( 2020 ) project are to be commended in that their resulting paper ranged broadly across the geologic setting, stratigraphy, paleocurrents, paleobotany...
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Journal Article
Published: 01 September 2016
Journal of Paleontology (2016) 90 (5): 981–1011.
... of Coryphodon from the lower slopes at Fossil Butte and included these specimens under his discussion of Coryphodon radians , a taxon now recognized as being restricted to Wasatchian biochron Wa-3 (Uhen and Gingerich, 1995 ). FOBU 6135: p4 = 26.1 x 20.8. Order Pholidota Weber...
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Journal Article
Published: 01 June 1988
Journal of the Geological Society (1988) 145 (3): 473–478.
... the Gray Bull zone (Wasatchian). The older generation of American palaeontologists gave much importance to perissodactyls for zonal division of the continental Palaeogene sequences in North America (Granger 1914). The lower part of the Wasatchian (the Gray Bull zone of the Lower Eocene) includes...