Resolving the Late Paleozoic Ice Age in Time and Space
Pennsylvanian and Permian sequences in Bolivia: Direct responses to Gondwana glaciation
Published:January 01, 2008
G.W Grader, P.E Isaacson, E Díaz-Martínez, M.C Pope, 2008. "Pennsylvanian and Permian sequences in Bolivia: Direct responses to Gondwana glaciation", Resolving the Late Paleozoic Ice Age in Time and Space, Christopher R. Fielding, Tracy D. Frank, John L. Isbell
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Western Gondwana underwent a steady drift from mid-latitudes (~50°S, Early Carboniferous) to lower latitudes (<40°S) by Late Carboniferous time, and glacial deposition had ended in Bolivia by the early Pennsylvanian (Morrowan). At this time, carbonates and evaporites were being deposited across the Perú-Bolivia Basin. The Pennsylvanian and Permian Titicaca Group represents an Andean transgressive marine to restricted carbonate and regressive red bed megasequence (Cuevo Super-sequence or Subandean Cycle). The transgressive part of this Pangean first-order sequence records inherited basement controls and ephemeral pericratonic seaways into the interior of a western landmass. The well-dated Copacabana Formation records many high-frequency sequences and...