The Carboniferous Timescale
CONTAINS OPEN ACCESS
The Carboniferous was the time of the assembly of Pangaea by the collision of the Gondwanan and Larussian supercontinents, and the principal interval of the late Paleozoic ice ages. These tectonic and climatic events caused dramatic sea-level fluctuations and climate changes and produced a Carboniferous world that was diverse topographically and climatologically, perhaps only rivalled in that diversity by the late Cenozoic world. Furthermore, the Carboniferous was a time of the accumulation of vast coal deposits of great economic and societal significance. The temporal ordering of geological and biotic events during Carboniferous time thus is critical to the interpretation of some unique and pivotal events in Earth history. This temporal ordering is based on the Carboniferous timescale, which has been developed and refined for nearly two centuries. This book reviews the history of the development of the Carboniferous chronostratigraphic scale and includes comprehensive analyses of Carboniferous radioisotopic ages, magnetostratigraphy, isotope-based correlations, cyclostratigraphy and timescale-relevant marine and non-marine biostratigraphy and biochronology.
Proposed chronostratigraphic units for the Carboniferous and early Permian of the southwestern Gondwana margin
Published:April 13, 2022
Carlos R. González, Pamela Díaz Saravia, 2022. "Proposed chronostratigraphic units for the Carboniferous and early Permian of the southwestern Gondwana margin", The Carboniferous Timescale, Spencer G. Lucas, Joerg W. Schneider, Xiangdong Wang, Svetlana Nikolaeva
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The western Andean belt of Argentina displays a comprehensive record of the Carboniferous and earliest Permian rocks so extensive that it allows an exceptional reconstruction of the Late Paleozoic Ice Age of the southwestern margin of the South American Gondwana area. Severe endemism of the Gondwana biota during this period makes it difficult to achieve a precise correlation of these glacially influenced deposits with the coeval sequences of the palaeoequatorial belt, where the subdivisions of the International Chronostratigraphic Chart (ICC) are currently defined. The abundant palaeontological record available from the Upper Paleozoic deposits of central-western Argentina, central Patagonia and eastern Argentina makes it possible to recognize five successive faunal stages that allow a proper ordering of the sequences of this period. The proposed regional stages, and their assumed chronological position regarding the standards of the current ICC, are: the Malimanian (late Tournaisian), Barrealian (Mid-Carboniferous or Serpukhovian–Bashkirian), Aguanegrian (Upper Pennsylvanian), Uspallatian (Asselian–Tastubian?) and Bonetian (Sakmarian). This paper aims to reiterate former recommendations about the convenience of having regional reference units and suggests the consideration of the available faunal stages as possible chronostratigraphic subdivisions for the Carboniferous–early Permian of the southeastern margin of Gondwana.