Terrestrial carbon isotope stratigraphy and mammal turnover during post-PETM hyperthermals in the Bighorn Basin, Wyoming, USA
نویسندگان
چکیده
Abstract. Paleogene hyperthermals, including the Paleocene–Eocene Thermal Maximum (PETM) and several other smaller events, represent global perturbations to Earth's climate system are characterized by warmer temperatures, changes in floral faunal communities, hydrologic changes. These events identified geologic record globally negative carbon isotope excursions (CIEs), resulting from input of isotopically light into atmosphere. Much about causes effects hyperthermals remains uncertain, whether all were caused same underlying processes, how biotic scale with magnitude why CIEs larger paleosol carbonates relative marine records. Resolving these questions is crucial for a full understanding their application future scenarios. The primary purpose this study was identify early Eocene Fifteenmile Creek area south-central Bighorn Basin, Wyoming, USA. This preserves sequence fluvial floodplain sedimentary rocks containing an extensive fossil mammals. Previous analysis assemblages revealed two pulses mammal turnover diversity interpreted correlate ETM2 H2 that follow PETM. was, however, based on long-distance correlation chemostratigraphic records elsewhere basin. We present new stratigraphies using micrite δ13C values carbonate nodules preserved between richly fossiliferous localities at stratigraphic positions H2. Carbon results show possibly subsequent I1 hyperthermal, recorded Creek. overlap previously recognized turnover. also somewhat than more northerly Basin suggest basin-wide differences soil moisture and/or vegetation could contribute variable CIE amplitudes terrestrial
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ژورنال
عنوان ژورنال: Climate of The Past
سال: 2022
ISSN: ['1814-9324', '1814-9332']
DOI: https://doi.org/10.5194/cp-18-681-2022