This file was created by the TYPO3 extension publications --- Timezone: CEST Creation date: 2026-04-16 Creation time: 22:03:42 --- Number of references 11 article Rasmussen2022 The Upper Triassic Chinle Formation, cropping out in and around Petrified Forest National Park (PFNP) in northern Arizona, U.S.A., preserves an important non-marine biotic and sedimentologic record of Late Triassic key Earth-life events. In 2013, the Colorado Plateau Coring Project (CPCP) obtained a 520-m-long core of the Triassic strata at PFNP to study this sedimentary record in unequivocal superposition and, among other goals, to test hypotheses about the paleoenvironmental and biotic changes preserved in the Sonsela Member of the Chinle Formation, and specifically their link to the Manicouagan impact and the Adamanian-Revueltian biotic turnover event (A-R transition). We sampled the Sonsela Member of CPCP core 1A for bulk organic material and for pedogenic carbonates to establish the δ13Corg, δ13Ccarb, and δ18Ocarb records. Throughout much of the Sonsela Member, the stable isotope record is characterized by a relatively narrow range of values (δ13Corg = ~ −25 to −30‰; δ13Ccarb = ~ −7 to −10‰; and δ18Ocarb = ~ −5 to −8‰). Based on these data, we estimate mean annual precipitation and correlate our isotope record to two previously developed, high resolution, multi-proxy age models for the CPCP core. Our new data set supports three main conclusions based on these observations: (1) whereas the A-R transition and the Manicouagan impact event might correlate in time, establishing a causal relationship between those two events remains challenging; (2) the Manicouagan impact as well as the A-R transition are not linked to a clear geochemical perturbation preserved in the CPCP core; and (3) multiple proxies agree the climate became more arid throughout the Sonsela Member, possibly contributing to the Adamanian-Revueltian biotic turnover. © 2022 Elsevier B.V. 2022 English 00310182 10.1016/j.palaeo.2022.111060 Palaeogeography, Palaeoclimatology, Palaeoecology 601 Elsevier B.V. Department of Geology & Geophysics, University of Utah, Salt Lake City, UT 84112-0102, United States; Natural History Museum of Utah, University of Utah, Salt Lake City, UT 84108-1214, United States; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78758, United States; Berkeley Geochronology Center, Berkeley, CA 94709, United States; Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180, United States; Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, United States; Department of Geosciences, University of Texas at Dallas, Richardson, TX 75080, United States; Department of Resource Management and Science, Petrified Forest National Park, Petrified Forest, AZ 86028, United States; School of Earth, Environment and Society, Bowling Green State University, Bowling Green, OH 43403, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States geochronology; historical record; paleoclimate; paleoenvironment; preservative; proxy climate record; stable isotope; Triassic, Arizona; United States https://www.scopus.com/inward/record.uri?eid=2-s2.0-85133408062&doi=10.1016%2fj.palaeo.2022.111060&partnerID=40&md5=dc24c32c1e195ffd71d9703666cc8556 cited By 0 C. Rasmussen R.B. Irmis R. Mundil M.F. Schaller J. Geissman W.G. Parker C.J. Lepre P.E. Olsen article Haque2021 The Colorado Plateau Coring Project Phase 1 (CPCP-1) acquired three continuous drill cores from Petrified Forest National Park (PFNP), Arizona, U.S.A., two of which (CPCP-PFNP13-1A and CPCP-PFNP13-2B) intersected the Upper Triassic Chinle Formation, Lower(?)-Middle Triassic Moenkopi Formation (MF) and Permian Coconino Sandstone. We examined both cores to construct a high-resolution magnetostratigraphy of MF strata, and progressive demagnetization data yield well-defined, interpretable paleomagnetic results. Each lithostratigraphic member of the MF (Wupatki, Moqui, and Holbrook members) contains authigenic and detrital hematite as the dominant magnetic carrier with distinguishing rock magnetic characteristics. Magnetostratigraphy of MF strata in both CPCP-1 cores consists of six normal and six reverse polarity magnetozones, from the youngest to the oldest, MF1n to MF6r. Recent single-crystal chemical abrasion–thermal ionization mass spectrometry (CA-TIMS) U-Pb data from a sample in magnetozone MF1n yield a latest Anisian/earliest Ladinian (241.38 ± 0.43 Ma) age. Correlation of the CA-TIMS-calibrated magnetostratigraphy with the astronomically tuned polarity timescale for the Middle Triassic deep-marine Guandao (GD) section of South China ties the magnetozone MF1n with GD8 and MF6r with GD2r, and implies that the MF spans, at most, the earliest Anisian (Aegean) to latest Anisian (Illyrian)/earliest Ladinian stages (ca. 246.8 to 241.5 Ma). This age estimate for the MF suggests that the timespan of the regional, pre-Norian disconformity is about 17 Ma, which demonstrates that MF vertebrate fossil assemblages in east-central Arizona are millions of years (minimally 3–4 Ma) younger than previously suggested and are all Anisian in age, with no indications of substantial hiatuses in the MF section. © 2021. American Geophysical Union. All Rights Reserved. 2021 English 21699313 10.1029/2021JB021899 Journal of Geophysical Research: Solid Earth 126 John Wiley and Sons Inc Department of Geosciences, University of Texas at Dallas, Richardson, TX, United States; Department of Earth & Planetary Sciences, University of New Mexico, Albuquerque, NM, United States; Department of Geology & Geophysics, University of Utah, Salt Lake City, UT, United States; Natural History Museum of Utah, University of Utah, Salt Lake City, UT, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Earth & Planetary Sciences, Rutgers University, Piscataway, NJ, United States; Berkeley Geochronology Center, Berkeley, CA, United States; Petrified Forest National Park, Petrified Forest, AZ, United States; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; Department of Geosciences, University of Arizona, Tucson, AZ, United States 9 Anisian; biostratigraphy; demagnetization; fossil assemblage; lithostratigraphy; magnetostratigraphy; vertebrate, Arizona; China; Colorado Plateau; Petrified Forest National Park; United States, Vertebrata https://www.scopus.com/inward/record.uri?eid=2-s2.0-85115752723&doi=10.1029%2f2021JB021899&partnerID=40&md5=1e06c12cfcd306ac2d67d07bdaf1ce36 cited By 5 Z. Haque J.W. Geissman R.B. Irmis P.E. Olsen C. Lepre H. Buhedma R. Mundil W.G. Parker C. Rasmussen G.E. Gehrels article Rasmussen2021539 The Upper Triassic Chinle Formation is a critical non-marine archive of lowpaleolatitude biotic and environmental change in southwestern North America. The well-studied and highly fossiliferous Chinle strata at Petrified Forest National Park (PFNP), Arizona, preserve a biotic turnover event recorded by vertebrate and palynomorph fossils, which has been alternatively hypothesized to coincide with tectonically driven climate change or with the Manicouagan impact event at ca. 215.5 Ma. Previous outcrop-based geochronologic age constraints are difficult to put in an accurate stratigraphic framework because lateral facies changes and discontinuous outcrops allow for multiple interpretations. A major goal of the Colorado Plateau Coring Project (CPCP) was to retrieve a continuous record in unambiguous superposition designed to remedy this situation. We sampled the 520-m-long core 1A of the CPCP to develop an accurate age model in unquestionable superposition by combining U-Pb zircon ages and magnetostratigraphy. From 13 horizons of volcanic detritus-rich siltstone and sandstone, we screened up to ~300 zircon crystals per sample using laser ablation–inductively coupled plasma–mass spectrometry and subsequently analyzed up to 19 crystals of the youngest age population using the chemical abrasion–isotope dilution–thermal ionization mass (CA-IDTIMS) spectrometry method. These data provide new maximum depositional ages for the top of the Moenkopi Formation (ca. 241 Ma), the lower Blue Mesa Member (ca. 222 Ma), and the lower (ca. 218 to 217 Ma) and upper (ca. 213.5 Ma) Sonsela Member. The maximum depositional ages obtained for the upper Chinle Formation fall well within previously proposed age constraints, whereas the maximum depositional ages for the lower Chinle Formation are relatively younger than previously proposed ages from outcrop; however, core to outcrop stratigraphic correlations remain uncertain. By correlating our new ages with the magnetostratigraphy of the core, two feasible age model solutions can be proposed. Model 1 assumes that the youngest, coherent U-Pb age clusters of each sample are representative of the maximum depositional ages and are close to (<1 Ma difference) the true time of deposition throughout the Sonsela Member. This model suggests a significant decrease in average sediment accumulation rate in the mid-Sonsela Member. Hence, the biotic turnover preserved in the mid-Sonsela Member at PFNP is also middle Norian in age, but may, at least partially, be an artifact of a condensed section. Model 2 following the magnetostratigraphic-based age model for the CPCP core 1A suggests instead that the ages from the lower and middle Sonsela Member are inherited populations of zircon crystals that are 1–3 Ma older than the true depositional age of the strata. This results in a model in which no sudden decrease in sediment accumulation rate is necessary and implies that the base of the Sonsela Member is no older than ca. 216 Ma. Independent of these alternatives, both age models agree that none of the preserved Chinle Formation in PFNP is Carnian (>227 Ma) in age, and hence the biotic turnover event cannot be correlated to the Carnian–Norian boundary but is rather a mid-Norian event. Our age models demonstrate the powers, but also the challenges, of integrating detrital CA-ID-TIMS ages with magnetostratigraphic data to properly interpret complex sedimentary sequences. © 2020 Geological Society of America 2021 English 00167606 10.1130/B35485.1 Bulletin of the Geological Society of America 133 Geological Society of America 539-558 Department of Geology & RLS Geophysics, University of Utah, Salt Lake City, Utah 84112-0102, United States; Natural History Museum of Utah, University of Utah, Salt Lake City, Utah 84108-1214, United States; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas 78758, United States; Berkeley Geochronology Center, Berkeley, California 94709, United States; Department of Geosciences, University of Arizona, Tucson, Arizona 85721, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, United States; Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey 08854, United States; Department of Geosciences, University of Texas at Dallas, Richardson, Texas 75080, United States; Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131-0001, United States; Division of Science and Resource Management, Petrified Forest National Park, Petrified Forest, Arizona 86028, United States Binary alloys; Chemical analysis; Climate change; Crystals; Deposition; Forestry; Geochronology; Inductively coupled plasma; Laser ablation; Mass spectrometers; Mass spectrometry; Silicate minerals; Stratigraphy; Zircon, Environmental change; Multiple interpretations; Paleoenvironmental change; Sediment accumulation; Sedimentary sequence; Stratigraphic correlation; Stratigraphic framework; U-pb zircon geochronologies, Lead alloys, accumulation rate; depositional environment; environmental change; geochronology; inductively coupled plasma method; magnetostratigraphy; paleoecology; paleoenvironment; stratigraphic correlation; Triassic; uranium-lead dating; zircon, Arizona; Petrified Forest National Park; United States, Vertebrata https://www.scopus.com/inward/record.uri?eid=2-s2.0-85109845370&doi=10.1130%2fB35485.1&partnerID=40&md5=1a75cd17daa2bc3bc629161cc0d643fb cited By 25 C. Rasmussen R. Mundil R.B. Irmis D. Geisler G.E. Gehrels P.E. Olsen D.V. Kent C. Lepre S.T. Kinney J.W. Geissman W.G. Parker article Gehrels2020257 Uranium-lead (U-Pb) geochronology was conducted by laser ablation - inductively coupled plasma mass spectrometry (LA-ICPMS) on 7175 detrital zircon grains from 29 samples from the Coconino Sandstone, Moenkopi Formation, and Chinle Formation. These samples were recovered from ∼520 m of drill core that was acquired during the Colorado Plateau Coring Project (CPCP), located in Petrified Forest National Park (Arizona). A sample from the lower Permian Coconino Sandstone yields a broad distribution of Proterozoic and Paleozoic ages that are consistent with derivation from the Appalachian and Ouachita orogens, with little input from local basement or Ancestral Rocky Mountain sources. Four samples from the Holbrook Member of the Moenkopi Formation yield a different set of Precambrian and Paleozoic age groups, indicating derivation from the Ouachita orogen, the East Mexico arc, and the Permo-Triassic arc built along the Cordilleran margin. A total of 23 samples from the Chinle Formation contain variable proportions of Proterozoic and Paleozoic zircon grains but are dominated by Late Triassic grains. LA-ICPMS ages of these grains belong to five main groups that correspond to the Mesa Redondo Member, Blue Mesa Member and lower part of the Sonsela Member, upper part of the Sonsela Member, middle part of the Petrified Forest Member, and upper part of the Petrified Forest Member. The ages of pre-Triassic grains also correspond to these chronostratigraphic units and are interpreted to reflect varying contributions from the Appalachian orogen to the east, Ouachita orogen to the southeast, Precambrian basement exposed in the ancestral Mogollon Highlands to the south, East Mexico arc, and Permian-Triassic arc built along the southern Cordilleran margin. Triassic grains in each chronostratigraphic unit also have distinct U and thorium (Th) concentrations, which are interpreted to reflect temporal changes in the chemistry of arc magmatism. Comparison of our LA-ICPMS ages with available chemical abrasion thermal ionization mass spectrometry (CA-TIMS) ages and new magnetostratigraphic data provides new insights into the depositional history of the Chinle Formation, as well as methods utilized to determine depositional ages of fluvial strata. For parts of the Chinle Formation that are dominated by fine-grained clastic strata (e.g., mudstone and siltstone), such as the Blue Mesa Member and Petrified Forest Member, all three chronometers agree (to within ∼ 1 Myr), and robust depositional chronologies have been determined. In contrast, for stratigraphic intervals dominated by coarse-grained clastic strata (e.g., sandstone), such as most of the Sonsela Member, the three chronologic records disagree due to recycling of older zircon grains and variable dilution of syn-depositional-age grains. This results in LA-ICPMS ages that significantly predate deposition and CA-TIMS ages that range between the other two chronometers. These complications challenge attempts to establish a well-defined chronostratigraphic age model for the Chinle Formation. © 2020 George Gehrels et al. 2020 English 26283735 10.5194/gchron-2-257-2020 Geochronology 2 Copernicus GmbH 257-282 Department of Geosciences, University of Arizona, Tucson, AZ 85721, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States; Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08854, United States; Petrified Forest National Park, Petrified ForestAZ 86028, United States; Berkeley Geochronology Center, 2455 Ridge Rd., Berkeley, CA 94709, United States; Natural History Museum of Utah, Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84108, United States; Department of Geosciences, University of Texas at Dallas, Richardson, TX 75080, United States 2 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85123292135&doi=10.5194%2fgchron-2-257-2020&partnerID=40&md5=73e22e865c75da505d8dc62fc5eecd3d cited By 9 G. Gehrels D. Giesler P. Olsen D. Kent A. Marsh W. Parker C. Rasmussen R. Mundil R. Irmis J. Geissman C. Lepre article Kent20194654 Article 2019 10.1029/2019GC008474 Geochemistry, Geophysics, Geosystems 20 4654 – 4664 11 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85074779240&doi=10.1029%2f2019GC008474&partnerID=40&md5=08e33200a86fa035ba2cf35625d8b207 Cited by: 28; All Open Access, Bronze Open Access Dennis V. Kent Paul E. Olsen Christopher Lepre Cornelia Rasmussen Roland Mundil George E. Gehrels Dominique Giesler Randall B. Irmis John W. Geissman William G. Parker article Olsen201815 Phase 1 of the Colorado Plateau Coring Project (CPCP-I) recovered a total of over 850m of stratigraphically overlapping core from three coreholes at two sites in the Early to Middle and Late Triassic age largely fluvial Moenkopi and Chinle formations in Petrified Forest National Park (PFNP), northeastern Arizona, USA. Coring took place during November and December of 2013 and the project is now in its post-drilling science phase. The CPCP cores have abundant detrital zircon-producing layers (with survey LA-ICP-MS dates selectively resampled for CA-ID-TIMS U-Pb ages ranging in age from at least 210 to 241 Ma), which together with their magnetic polarity stratigraphy demonstrate that a globally exportable timescale can be produced from these continental sequences and in the process show that a prominent gap in the calibrated Phanerozoic record can be filled. The portion of core CPCP-PFNP13-1A for which the polarity stratigraphy has been completed thus far spans ~ 215 to 209Ma of the Late Triassic age, and strongly validates the longer Newark-Hartford Astrochronostratigraphic-calibrated magnetic Polarity Time-Scale (APTS) based on cores recovered in the 1990s during the Newark Basin Coring Project (NBCP). Core recovery was ~ 100% in all holes (Table 1). The coreholes were inclined ~ 60-75° approximately to the south to ensure azimuthal orientation in the nearly flat-lying bedding, critical to the interpretation of paleomagentic polarity stratigraphy. The two longest of the cores (CPCP-PFNP13-1A and 2B) were CT-scanned in their entirety at the University of Texas High Resolution X-ray CT Facility in Austin, TX, and subsequently along with 2A, all cores were split and processed at the CSDCO/LacCore Facility, in Minneapolis, MN, where they were scanned for physical property logs and imaging. While remaining the property of the Federal Government, the archive half of each core is curated at the NSF-sponsored LacCore Core Repository and the working half is stored at the Rutgers University Core Repository in Piscataway, NJ, where the initial sampling party was held in 2015 with several additional sampling events following. Additional planned study will recover the rest of the polarity stratigraphy of the cores as additional zircon ages, sedimentary structure and paleosol facies analysis, stable isotope geochemistry, and calibrated XRF core scanning are accomplished. Together with strategic outcrop studies in Petrified Forest National Park and environs, these cores will allow the vast amount of surface paleontological and paleoenvironmental information recorded in the continental Triassic of western North America to be confidently placed in a secure context along with important events such as the giant Manicouagan impact at ~ 215:5 Ma (Ramezani et al., 2005) and long wavelength astronomical cycles pacing global environmental change and trends in atmospheric gas composition during the dawn of the dinosaurs. © Author(s) 2018. 2018 English 18168957 10.5194/sd-24-15-2018 Scientific Drilling 24 Copernicus GmbH 15-40 Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States; Department of Geosciences, University of Texas at Dallas, Richardson, TX 75080, United States; Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08854, United States; Department of Geosciences, University of Arizona, Tucson, AZ 85721, United States; Berkeley Geochronology Center, 2455 Ridge Rd., Berkeley, CA 94709, United States; Natural History Museum of Utah and Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84108, United States; Petrified Forest National Park, Petrified Forest, AZ 86028, United States; Department of Earth and Atmospheric Sciences, Central Michigan University, Mount Pleasant, MI 48859, United States; Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, Oslo, 0316, Norway; MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; Earth and Environmental Sciences, Rensselaer Polytechnic Institute (RPI), Troy, NY 12180, United States; National Oceanography Centre, Southampton, University of Southampton, Southampton, SO17 1BJ, United Kingdom; Continental Scientific Drilling Coordination Office and LacCore Facility, N.H. Winchell School of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, United States; University of Texas High Resolution X-ray CT Facility, The University of Texas at Austin, Austin, TX 78712, United States; Centro de Geociencias, Universidad Nacional Autónoma de México (UNAM), Boulevard Juriquilla No. 3001, Querétaro, 76230, Mexico; Martin-Luther-Universität, Halle-Wittenberg, Institut für Geowissenschaften, Von-Seckendorff-Platz 3, Halle (Saale), 06120, Germany; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology and Center for Excellence in Life and Paleoenvironment, Nanjing, 210008, China Computerized tomography; Exploratory geochemistry; Forestry; Lead alloys; Recovery; Sedimentology; Silicate minerals; Stratigraphy; Thallium alloys; Zircon, Additional sampling; Azimuthal orientation; Environmental change; Federal governments; Global environmental change; Rutgers University; Sedimentary structure; University of Texas, Magnetic polarity https://www.scopus.com/inward/record.uri?eid=2-s2.0-85055482770&doi=10.5194%2fsd-24-15-2018&partnerID=40&md5=ad9459c47e8c131b4e9f4f83ea406f92 cited By 17 P.E. Olsen J.W. Geissman D.V. Kent G.E. Gehrels R. Mundil R.B. Irmis C. Lepre C. Rasmussen D. Giesler W.G. Parker N. Zakharova W.M. Kürschner C. Miller V. Baranyi M.F. Schaller J.H. Whiteside D. Schnurrenberger A. Noren K.B. Shannon R. O'Grady M.W. Colbert J. Maisano D. Edey S.T. Kinney R. Molina-Garza G.H. Bachman J. Sha G. Bachman R. Blakey K. Brady Shannon H. Buhedma M. Colbert G. Gehrels J. Geissman Z. Haque R. Irmis D. Kent S. Kinney W. Kürschner P. Olsen W. Parker M. Schaller J. Whiteside J. MacIntosh article Baranyi2018775 Fossil plant assemblages including spores and pollen grains provide useful information on past ecosystems and the response of terrestrial biotas to various environmental perturbations. New quantitative palynological data from the Chinle Formation of the American Southwest suggest that a floral turnover occurred in the middle Norian (between 217 and 213 Ma). Analysis of plant communities reveals that this turnover was followed by a complete reorganization of the riparian vegetation, driven by changes in fluvial styles and the tectonic regime of the basin, as well as a gradual transition toward a more arid climate. Marked increases in Klausipollenites gouldii, Patinasporites spp., and Froelichsporites traversei are probable indicators of environmental stress, such as increased aridity, perturbations of atmospheric pCO2, acid rain, and atmospheric aerosol accumulation due to volcanism in connection with the Pangean rifting and uplift of the Cordilleran arc. Comparison of the vegetation turnover with younger assemblages from the Chinle Formation in New Mexico revealed similar floral turnover patterns, suggesting two distinct drier periods as a result of multiple climatic oscillations. The climate-induced floral turnover may have contributed to the vertebrate faunal turnover as the loss of wetland habitat space and an increase in xerophytic plants may have dwindled the supply of palatable vegetation for herbivores. The onset of the floral turnover in Arizona roughly corresponds to the Manicouagan impact event, but a direct causal link is still speculative. © 2017 Geological Society of America. 2018 English 00167606 10.1130/B31673.1 Bulletin of the Geological Society of America 130 Geological Society of America 775-795 Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, Oslo, 0316, Norway; Lamont-Doherty Earth Observatory, 61 Route 9W, P.O. Box 1000, Palisades, NY 10964-8000, United States; Division of Resource Management, Petrified Forest National Park, 1 Park Road, #2217, Petrified Forest, AZ 86028, United States 5-6 Acid rain; Atmospheric aerosols; Ecosystems, Climatic oscillations; Environmental change; Environmental perturbations; Environmental stress; Gradual transition; Plant communities; Riparian vegetation; Vegetation history, Vegetation, aridity; environmental change; Norian; paleoclimate; paleoenvironment; paleogeography; palynology; plant community; vegetation history, Arizona; Petrified Forest National Park; United States, Klausipollenites; Vertebrata https://www.scopus.com/inward/record.uri?eid=2-s2.0-85041313171&doi=10.1130%2fB31673.1&partnerID=40&md5=79f3b4c5b6624fbc81c8ea54aee80b50 cited By 25 V. Baranyi T. Reichgelt P.E. Olsen W.G. Parker W.M. Kürschner article mundil2010calibration 2010 Geochimica et Cosmochimica Acta 74 PERGAMON-ELSEVIER SCIENCE LTD THE BOULEVARD, LANGFORD LANE, KIDLINGTON~… A738--A738 12 Roland Mundil Randall B Irmis Paul E Olsen Dennis V Kent article Geissman2010128 2010 English 00963941 10.1029/2010eo140006 Eos 91 American Geophysical Union 128 Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ, United States; Lamont-Doherty Earth Observatory of Columbia University, United States 14 conference proceeding; plateau; site selection, Colorado; United States https://www.scopus.com/inward/record.uri?eid=2-s2.0-77954578562&doi=10.1029%2f2010eo140006&partnerID=40&md5=620142916591c2aaeb7930b2ba21e24a cited By 0 J.W. Geissman P.E. Olsen D.V. Kent article https://doi.org/10.1029/2008EO120003 A workshop was convened in St. George, Utah, to advance planning for the Colorado Plateau Coring Project (CPCP). The vast continental basins of the southwestern United States, particularly well exposed on the Colorado Plateau and its environs, contain one of the richest stratigraphic records of early Mesozoic age (between roughly 145 and 250 million years ago). This time period was punctuated by two of the major mass extinctions in the past 550 million years and witnessed the evolutionary appearance of the modern biota and dramatic climate changes on the continents. Since the mid-nineteenth century, classic studies of these basins, their strata, and their fossils have made this sequence instrumental in framing our context for the early Mesozoic world. Nonetheless, striking ambiguities in temporal resolution, uncertainties in global correlations with other early Mesozoic strata, and major doubts about latitudinal position still hamper testing of the major competing climatic, biotic, and tectonic hypotheses. 2008 https://doi.org/10.1029/2008EO120003 Eos, Transactions American Geophysical Union 89 118-118 12 https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2008EO120003 Paul E. Olsen Dennis V. Kent John W. Geissman article Olsen200862 2008 English 18168957 10.2204/lodp.sd.6.12.2008 Scientific Drilling 62-66 Lamont-Doherty Earth Observatory (LDEO), Columbia University, 61 Route 9W, Palisades, NY 10964-1000, United States; Department of Earth and Planetary Sciences, Rutgers University, 610 Taylor Road, Piscataway, NJ 08854, United States; Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, United States; Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, United States 6 https://www.scopus.com/inward/record.uri?eid=2-s2.0-78651551909&doi=10.2204%2flodp.sd.6.12.2008&partnerID=40&md5=8165ee0f275da48a79fe178f287963c1 cited By 1 P.E. Olsen D.V. Kent J.W. Geissman