Journal
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
Volume 85, Issue -, Pages 263-277Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsames.2018.05.005
Keywords
Mollusks; Eurydesma fauna; Post-glacial deposits; Taphonmy; Estuarine systems
Categories
Funding
- Brazilian Council for Scientific and Technological Development (CNPq) [401826/2010-4]
- CAPES
- CNPq [311473/2013-0, 303863/2016-1]
- [CAPES/PVE/88881.062157-2014-01]
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In the Gondwanan Parana Basin, two fossil assemblages with affinity to the Eurydesma Fauna are well known in the Early Permian post-glacial deposits of the Rio Bonito Formation. Although the assemblages display similar invertebrate fossil content, the fossil concentrations were potentially accumulated in different paleo-bathymetric zones represented by the shallow marine and marginal marine settings. This paper provides a taphonomic analysis of the body-fossil concentration and the ichnological signatures of the fossiliferous deposits of the Rio Bonito Formation at the southern border of the Parana Basin and also discusses their paleo-ecological and paleo-environmental significance. Three distinct taphofacies representing the fair-weather deposits, storm-wave deposits in the inner part of estuary, and time-averaged and storm-influenced deposits in the outer part of the estuary were recognized in the studied succession. They characterize the depositional processes that filled a shallow, marginal marine paleovalley formed during the Late Paleozoic Ice Age. The taphonomic signatures of the fossil concentrations suggest deposition under the transgressive and highstand phases of the paleo-valley infill. These new data reinforce the previous interpretation of the paleo-valley infill as estuarine depositional setting and further contribute to refining the stratigraphic framework of the post-glacial deposits at the southern margin of the Parana Basin.
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