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GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania

Paper No. 166-23
Presentation Time: 8:00 AM-5:30 PM

FUNGAL ASSEMBLAGES CHANGE WITH DEPOSITIONAL ENVIRONMENT AND IMPACT PALEOCLIMATE RECONSTRUCTIONS: A CASE STUDY FROM THE MIOCENE OF NW PERU


CABRERA, Jeremyah1, MARSH, Christopher2, VANDERESPT, L. Olivia3, SMALLWOOD, Liberty F.3, ROMERO, Ingrid4, NUÑEZ OTAÑO, Noelia5, OCHOA, Diana6 and O'KEEFE, Jen7, (1)Craft Academy for Excellence in Science and Mathematics, Morehead State University, 150 University Blvd., Morehead, KY 40351, (2)Morehead State University, Department of Physics, Earth Science, and Space Systems Engineering, 123 Lappin Hall, Morehead, KY 40351, (3)Department of Biology and Chemistry, Morehead State University, Morehead, KY 40351, (4)Department of Paleobiology, Smithsonian Institution, Washington, DC 20560, (5)Universidad Autónoma de Entre Ríos, Sede Diamante and CICyTTP (CONICET-UADER-Prov.ER), Laboratorio de Geología de Llanuras, Facultad de Ciencia y Tecnología, Diamante, MS E3105, (6)Department of Geology, University of Salamanca, Patio de Escuelas, 1, Salamanca, 37008, Spain, (7)Morehead State University, Department of Physics, Earth Science, and Space Systems Engineering, 150 University Blvd., Morehead, KY 40351

Development of a new fungal assemblage proxy for paleoclimate reconstructions means delineating where the proxy should and should not be applied. Previous work has eliminated deep sea fans. In this work, we explore the relationship of fungal assemblages, both in terms of spore types and assemblage richness, to depositional environments represented by the Heath Fm. to ?Cardalitos? Fm. succession in northwestern Peru. Samples from the lower part of the section, interpreted to be most off-shore contain a sparse, low-diversity assemblage, while the uppermost part of the section, representing a mangrove and surrounding sediments, contains an abundant, diverse assemblage. Fungal assemblages from sediments interpreted as more off-shore contain primarily round amerospores and didymospores; closer to and on-shore, complex phragmospores and bubils occur. Nearest living relative-based paleoclimate reconstructions for the fungal assemblages indicate that better reconstructions are obtained for samples that contain greater taxonomic richness and greater spore shape diversity. We suggest that the fungal proxy should be, as much as possible, restricted to onshore or very nearshore environments.

Session No. 166--Booth# 93

D25. Recent Developments in Paleoecology (Posters)
Tuesday, 17 October 2023: 8:00 AM-5:30 PM
Hall B (David L Lawrence Convention Center)
Geological Society of America Abstracts with Programs. Vol. 55, No. 6
doi: 10.1130/abs/2023AM-395088
© Copyright 2023 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.
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