Some recent papers:
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Spencer G. Lucas, Matthew R. Stimson, Olivia A. King, John H. Calder, Chris F. Mansky, Brian L. Hebert and Adrian P. Hunt (2021)
A synopsis of fossil vertebrate footprints from the latest Carboniferous and early Permian redbeds of northern Nova Scotia and Prince Edward Island, Canada.
Geological Society, London, Special Publications 512 The Carboniferous Timescale (advance online publication)
doi:
https://doi.org/10.1144/SP512-2020-235https://sp.lyellcollection.org/online-first/512
The Carboniferous record of tetrapod footprints is mostly of Euramerican origin and provides the basis for a footprint biostratigraphy and biochronology of Carboniferous time that identifies four tetrapod footprint biochrons: (1) stem-tetrapod biochron of Middle Devonian-early Tournaisian age; (2) Hylopus biochron of middle-Tournaisian-early Bashkirian age; (3) Notalacerta-Dromopus interval biochron of early Bashkirian-Kasimovian age; and (4) Dromopus biochron of Kasimovian-early Permian age. Particularly significant is the Carboniferous tetrapod footprint record of the Maritimes basin of eastern Canada (New Brunswick, Nova Scotia and Prince Edward Island), which encompasses well-dated and stratigraphically superposed footprint assemblages of Early Mississippian-early Permian age. The Carboniferous tetrapod footprint record provides these important biostratigraphic datums: (1) oldest temnospondyls (middle Tournaisian); (2) oldest reptiliomorphs, likely anthracosaurs (middle Tournaisian); (3) oldest amniotes (early Bashkirian); and (4) oldest high fiber herbivores (Bashkirian). Carboniferous tetrapod footprints thus provide significant insight into some major events of the Carboniferous evolution of tetrapods.
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Free pdf:
The Permian-Triassic mass extinction was marked by a massive release of carbon into the ocean-atmosphere system, evidenced by a sharp negative carbon isotope excursion. Large carbon emissions would have increased atmospheric pCO2 and caused global warming. However, the magnitude of pCO2 changes during the PTME has not yet been estimated. Here, we present a continuous pCO2 record across the PTME reconstructed from high resolution Î13C of C3 plants from southwestern China. We show that pCO2 increased from 426 +133/â96 ppmv in the latest Permian to 2507 +4764/â1193 ppmv at the PTME within about 75 kyr, and that the reconstructed pCO2 significantly correlates with sea surface temperatures. Mass balance modelling suggests that volcanic CO2 is probably not the only trigger of the carbon cycle perturbation, and that large quantities of 13C-depleted carbon emission from organic matter and methane were likely required during complex interactions with the Siberian Traps volcanism.
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