Pauromys and other small Sciuravidae (Mammalia: Rodentia) from the middle Eocene of Texas

Walton, Anne H.

doi:10.1080/02724634.1993.10011503

Cited by 10 publications

(6 citation statements)

References 13 publications

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“… Mammalian taxa identified from Whistler Squat local fauna localities TMM-41372 and TMM-41466 and their Bridgerian (Br) and Uintan (Ui) biochronological zone ranges based on Wilson [7] , Wilson and Runkel [51] , Walton [60] , Williams and Kirk [12] , Robinson [1] , Gunnell et al [2] , and this study. Gray bars indicate range extension of non-endemic taxa compared to Robinson et al [1] and Gunnell et al [2] .…”

Section: Discussionmentioning

confidence: 74%

“…However, TMM 41372-279 exhibits the highly lophate cusps that are typical of the genus Pauromys . This specimen was included by Walton [60] in the hypodigm of Pauromys texensis , and we see no reason to revise this attribution. All other known specimens of P. texensis occur at a single locality that is located higher in the Devil’s Graveyard Formation stratigraphic section (TMM 41745; “Serendipity”, Figure 2 ) and considered to be Ui3 in age by Robinson et al [1] .…”

Section: Resultsmentioning

confidence: 88%

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Geochronological and Taxonomic Revisions of the Middle Eocene Whistler Squat Quarry (Devil’s Graveyard Formation, Texas) and Implications for the Early Uintan in Trans-Pecos Texas

et al. 2014

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The Whistler Squat Quarry (TMM 41372) of the lower Devil’s Graveyard Formation in Trans-Pecos Texas is a middle Eocene fossil locality attributed to Uintan biochronological zone Ui1b. Specimens from the Whistler Squat Quarry were collected immediately above a volcanic tuff with prior K/Ar ages ranging from ∼47–50 Ma and below a tuff previously dated to ∼44 Ma. New 40Ar/39Ar analyses of both of the original tuff samples provide statistically indistinguishable ages of 44.88±0.04 Ma for the lower tuff and 45.04±0.10 Ma for the upper tuff. These dates are compatible with magnetically reversed sediments at the site attributable to C20r (43.505–45.942 Ma) and a stratigraphic position above a basalt dated to 46.80 Ma. Our reanalysis of mammalian specimens from the Whistler Squat Quarry and a stratigraphically equivalent locality significantly revises their faunal lists, confirms the early Uintan designation for the sites, and highlights several biogeographic and biochronological differences when compared to stratotypes in the Bridger and Uinta Formations. Previous suggestions of regional endemism in the early Uintan are supported by the recognition of six endemic taxa (26% of mammalian taxa) from the Whistler Squat Quarry alone, including three new taxa. The revised faunal list for the Whistler Squat Quarry also extends the biostratigraphic ranges of nine non-endemic mammalian taxa to Ui1b.

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Section: Discussionmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 88%

Geochronological and Taxonomic Revisions of the Middle Eocene Whistler Squat Quarry (Devil’s Graveyard Formation, Texas) and Implications for the Early Uintan in Trans-Pecos Texas

et al. 2014

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“…Microeutypomys is known from the Uintan of the Texas GulfCoast and from the Duchesnean ofSaskatchewan, but has not yet been reported from any of the other welldocumented Uintan or Duchesnean assemblages of the Northern Interior and of Trans-Pecos Texas, 400 kilometers from Laredo. This spotty distribution is in contrast to the speciose small rodents of the sciuravid and eomyid clades, such as Pauromys (Walton, 1993) or "Namatomys," ERRATUM Journal of Vertebrate Paleontology, Volume 13, Number I. The most parsimonius tree depicting the phylogeny ofthe Sphenosuchia (Figure 21) in the paper by WU and Chatterjee was an outdated version; the authors did not realize this since the senior author had no chance to read the proof.…”

Section: Introductionmentioning

confidence: 79%

“…Lophs" and "lophatc" (for long, tall structures) and "rugosity" (for non-structural wrinkling) refer to deeper tooth topography manifested in underlying dentine. Cusp terminology is as in Walton (1993 (Storer, 1988).…”

Section: Introductionmentioning

confidence: 99%

A new genus of eutypomyid (Mammalia: Rodentia) from the middle Eocene of the Texas Gulf Coast

Walton¹

1993

J. of Vertebrate Paleontology

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“…Revised faunal list for the Purple Bench Locality (TMM 41672). Compiled from (West, 1982;Gustafson, 1986;Wilson, 1986b;Walton, 1993;Williams and Kirk, 2008;Kirk and Williams, 2011;Stocker and Kirk, 2016;Kirk, 2018). * = endemic taxon known only from Purple Bench.…”

Section: Existing Relative and Absolute Age Constraintsmentioning

confidence: 99%

Geochronology of the middle Eocene Purple Bench Locality (Devil’s Graveyard Formation), Trans-Pecos Texas, USA

Atwater

Thomson

Kirk

et al. 2020

Palaeontol Electron

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Purple Bench is a middle Eocene fossil locality in the Devil's Graveyard Formation of the Trans-Pecos region of West Texas. In addition to yielding a range of taxa characteristic of the Uintan North American Land Mammal Age, the Purple Bench locality is noteworthy in documenting a number of endemic species that are known only from the site. Despite the Uintan character of the mammalian fauna, the absolute age of Purple Bench is a matter of debate. This uncertainty stems from the wide interval of time encompassed by current radiometric dates bracketing the Purple Bench locality and from conflicting magnetostratigraphic correlations in the Devil's Graveyard Formation. This study constrains the absolute age of the Purple Bench locality through detrital zircon U-Pb geochronological analyses. For these analyses, 147 new detrital zircon U-Pb ages were collected from five tuffaceous sandstones and reworked tuff horizons and analyzed via Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). These new detrital zircon U-Pb geochronological analyses suggest a maximum depositional age of 43.7 +0.8 /-0.2 Ma for the Purple Bench tuff, a significant marker horizon immediately below the Purple Bench locality. These new maximum depositional age dates presented here provide constraints on the true depositional age of the lower and middle members of the Devil's Graveyard Formation, bringing clarity to the previously ambiguous age of the fossil-bearing Purple Bench locality. The age constraints presented here also aid the characterization of the temporally and spatially variable Uintan North American Land Mammal Age.

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Pauromys and other small Sciuravidae (Mammalia: Rodentia) from the middle Eocene of Texas

Cited by 10 publications

References 13 publications

Geochronological and Taxonomic Revisions of the Middle Eocene Whistler Squat Quarry (Devil’s Graveyard Formation, Texas) and Implications for the Early Uintan in Trans-Pecos Texas

Geochronological and Taxonomic Revisions of the Middle Eocene Whistler Squat Quarry (Devil’s Graveyard Formation, Texas) and Implications for the Early Uintan in Trans-Pecos Texas

A new genus of eutypomyid (Mammalia: Rodentia) from the middle Eocene of the Texas Gulf Coast

Geochronology of the middle Eocene Purple Bench Locality (Devil’s Graveyard Formation), Trans-Pecos Texas, USA

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