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BIOGENIC STRUCTURES OF UNIONIFORM BIVALVES IN WET-INTERDUNE DEPOSITS (LATE MIOCENE–EARLY PLIOCENE, ARGENTINA)

2018; Society for Sedimentary Geology; Volume: 33; Issue: 9 Linguagem: Inglês

10.2110/palo.2018.030

1938-5323

Noelia B. Carmona, Juan José Ponce, Andreas Wetzel,

Geological and Tectonic Studies in Latin America

Research Article| September 18, 2018 BIOGENIC STRUCTURES OF UNIONIFORM BIVALVES IN WET-INTERDUNE DEPOSITS (LATE MIOCENE–EARLY PLIOCENE, ARGENTINA) NOELIA B. CARMONA; NOELIA B. CARMONA 1CONICET, Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, General Roca. 8332, Rio Negro, Argentina Search for other works by this author on: GSW Google Scholar JUAN JOSÉ PONCE; JUAN JOSÉ PONCE 1CONICET, Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, General Roca. 8332, Rio Negro, Argentina Search for other works by this author on: GSW Google Scholar ANDREAS WETZEL ANDREAS WETZEL 2Geologisch–Paläontologisches Institut, Universität Basel, Bernoullistrasse 32, CH-4056 Basel, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information NOELIA B. CARMONA 1CONICET, Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, General Roca. 8332, Rio Negro, Argentina JUAN JOSÉ PONCE 1CONICET, Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, General Roca. 8332, Rio Negro, Argentina ANDREAS WETZEL 2Geologisch–Paläontologisches Institut, Universität Basel, Bernoullistrasse 32, CH-4056 Basel, Switzerland email: ncarmona@unrn.edu.ar Publisher: SEPM Society for Sedimentary Geology First Online: 18 Sep 2018 Online Issn: 1938-5323 Print Issn: 0883-1351 Copyright © 2018, SEPM (Society for Sedimentary Geology) PALAIOS (2018) 33 (9): 431–440. https://doi.org/10.2110/palo.2018.030 Article history First Online: 18 Sep 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation NOELIA B. CARMONA, JUAN JOSÉ PONCE, ANDREAS WETZEL; BIOGENIC STRUCTURES OF UNIONIFORM BIVALVES IN WET-INTERDUNE DEPOSITS (LATE MIOCENE–EARLY PLIOCENE, ARGENTINA). PALAIOS 2018;; 33 (9): 431–440. doi: https://doi.org/10.2110/palo.2018.030 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyPALAIOS Search Advanced Search Abstract Environmental changes within a Neogene coastal dune system are recorded by endobenthic unioniform bivalves that lived in muddy or sandy interdune pond sediments. These bivalves were suspension-filter feeders that formed dense, almost monospecific communities in the wet-interdune deposits of the continental intervals of the Río Negro Formation (late Miocene–early Pliocene). Activity of unioniform bivalves appears to be related to sediment type; resting and locomotion traces dominate in the muddy heterolithic facies, whereas equilibrium/escape structures prevail in the sand-dominated heterolithic facies. These traces characterize two scenarios of the wet-interdune development. First, during high and/or relatively stable water levels, bivalves colonized the muddy bottom and produced resting and locomotion traces. When water level dropped due to desiccation, biogenic structures were impacted by the formation of mud cracks and subsequently covered by sand delivered by migrating dunes. Second, in spite of dune migration, some interdune areas remained wet or flooded and, in response to sediment aggradation, the bivalves produced equilibrium or escape structures, depending on the thickness of eolian sand cover. Only the integration of ichnologic and sedimentologic observations allows deciphering the evolution of the Neogene wet-interdune system in such a detail. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.