Amy L. Atwater, Kelly D. Thomson, E. Author biographies Plain-language and multi-lingual abstracts version. 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.
The Trans-Pecos region of Texas encompasses the southern-most extent of the Rocky Mountains in the United States and preserves southern Laramide foreland basin environments from the Eocene (Figure 1; Stevens et al., a; Wilson, a; Runkel, ; Lehman et al., ). Exposures of the DGF occur entirely within the Tornillo Basin and Author: Amy L. Atwater, Kelly D. Thomson, E. Christopher Kirk, Meaghan Emery-Wetherel, Logan Wetherell, Dani. Pecos Houston is full of single men and women like you looking for dates, lovers, friendship, and fun. Sign up today to browse the FREE personal ads of available Texas singles, and hook up online using our completely new Pecos Tx online dating service! Start dating in Pecos Midland today! Sign up in 30 seconds and meet someone. Other Texas. Pecos Dating: Browse Pecos, TX Singles & Personals. Lone Star State of Texas. A global community of quality single adults who share common goals - intelligent individuals who want to find great dates, make new friends, form romantic relationships or meet life partners. We prove that an online dating personals site can really lead to a long-lasting sincere relationship. Single in Pecos?
The TuffZirc algorithm was designed for the extraction of a reliable age from primarily deposited tuffs and reworked tuffaceous units. Detrital zircon U-Pb results are displayed in Figure 3 and summarized in Table 2. A weighted mean of Fifty-four detrital zircons were analyzed from Purple Bench tuff at sublocality 8.
Individual zircon U- Pb ages range from The TuffZirc weighted mean calculated was found to be By comparison, a weighted mean of The Peaches locality yielded a weighted mean age of Three samples contain individual detrital zircon U-Pb ages older than 47 Ma in addition to the dominant young syn-depositional zircon U-Pb age component.
The maximum depositional ages MDAs presented herein represent an upper bound estimate of the true depositional ages TDAs of these sedimentary horizons and thus the fossils contained within Dickinson and Gehrels, ; Coutts et al.
Following the principle of inclusions Lyell,any zircon contained within a sandstone or tuffaceous sandstone must be older than the sandstone or tuffaceous sandstone itself. The time difference between the zircon derived MDA estimate and the TDA incorporates the time required for the zircon to crystalize, erupt from its volcanic center, erode and be transported into the basin before it is deposited.
This time lag can be assumed to be negligible or within analytical uncertainty in depositional environments located in close proximity to volcanic centers that were active at the time of deposition Dickinson and Gehrels, Given the close proximity of syn-depositionally active volcanic centers, the MDAs presented here are interpreted as the TDAs of the sedimentary strata Dickinson and Gehrels, ; Coutts et al.
A negligible time lag between zircon crystallization and deposition of these sandstones and tuffaceous sandstones is assumed Dickinson and Gehrels, ; Coutts et al. These zircon grains were most likely derived from volcanic centers in the vicinity of the Tornillo Basin, as evidenced by the high proportion of euhedral zircons composing the youngest coherent age mode and regional geologic studies Stevens et al.
Further evidence supporting a negligible time lag between zircon crystallization and deposition include the dominance of young ages within the samples, the overlap of the young ages with existing depositional age constrains for the basin, the clustering of young ages indicating a single point source, and the gradual decrease in individual ages and MDAs up-section.
These older ages indicate either inheritance within the magma chamber or the reworking of previously deposited tuffs and sandstones during sediment transport and deposition.
Error ranges for the two samples overlap, suggesting that both the Purple Bench tuff and the fossils from the Purple Bench locality to have a TDA range of An estimated absolute age for the Purple Bench locality between The magnetostratigraphic studies of the DGF have historically been complicated by multiple interpretations for Chron assignments in the middle member of the DGF Walton, ; Prothero ; Murphey et al.
This study brings clarity to the debate of the absolute age of the Purple Bench locality, which has positive implications for defining the Uintan NALMA on a broader, continental level.
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Indeed, with an absolute age range of If so, then classic Ui2 assemblages known from other regions of North America e. Here we report the first absolute dates for the lower and middle members of the DGF based on detrital zircon U-Pb geochronology.
The maximum depositional age calculated for the Purple Bench locality The stratigraphically higher Peaches locality in the middle member of the DGF has an absolute age range of These new U-Pb data are consistent with prior radiometric dates for the DGF and the Uintan character of the fauna recovered from these fossil localities. These new dates provide further evidence supporting magnetostratigraphic age models placing the lower and middle members of the DGF at the C20R and C20N Chron transition.
These chronostratigraphic constraints aid the characterization of the temporally and spatially variable Uintan land mammal age. We thank J. Clarke and her Geo T course for feedback on earlier versions of this manuscript, specifically A.
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Papendieck, S. Davis, and J. Thanks to S.
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Egberts and I. Lundeen for field assistance, and L. We thank R. Willis, W. Cook, N. Thanks to C.
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Campisano, A. Cole, E. Davis, P. Murphey, and B. Townsend for discussion. We acknowledge J. Stevens, M. Stevens, J. Wilson, B. Atwater, an Equinor Fellowship for K.
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Thomson, a Billy Carr Fellowship to E. Kirk, a Thomas Condon Fellowship for M. Andersen, T.
Detrital zircons as tracers of sedimentary provenance: limiting conditions from statistics and numerical simulation. Chemical Geology, Campisano, C.
PloS One, 9:e Coutts, D.
Assessment of widely used methods to derive depositional ages from detrital zircon populations. Geoscience Frontiers, Dickinson, W. Use of U-Pb ages of detrital zircons to infer maximum depositional ages of strata: a test against a Colorado Plateau Mesozoic database. Earth and Planetary Science Letters, Emery-Wetherell, M. Geological Society of America Abstracts with Programs, Gradstein, F. Geologic Time Scale Elsevier, Oxford, Netherlands.
Gunnell, G. Museum of Northern Arizona Bulletin, Gustafson, E. Texas Memorial Museum, Henry, C. Bulletin of Volcanology, Jackson, S.
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The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology. Johnstone, S.
A stratigraphic approach to inferring depositional ages from detrital geochronology data. Frontiers in Earth Science, Kirk, E. American Journal of Physical Anthropology, Journal of Human Evolution, Lawton, T.
Provenance of Upper Cretaceous-Paleogene sandstones in the foreland basin system of the Sierra Madre Oriental, northeastern Mexico, and its bearing on fluvial dispersal systems of the Mexican Laramide Province. Geological Society of America Bulletin, Lehman, T. Sedimentary Geology, From the Craigslist wheel head to Leisure land nearby and go to the Craigslist to have your photo taken.
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