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Biogenic structures of unioniform bivalves in wet-interdune deposits (Late Miocene-Early Pliocene, Argentina)

Carmona, Noelia B. and Ponce, Juan José and Wetzel, Andreas. (2018) Biogenic structures of unioniform bivalves in wet-interdune deposits (Late Miocene-Early Pliocene, Argentina). Palaios, 33 (9). pp. 431-440.

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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.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Sedimentology (Wetzel)
UniBasel Contributors:Wetzel, Andreas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Society for Sedimentary Geology
ISSN:0883-1351
e-ISSN:1938-5323
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:25 Oct 2019 14:16
Deposited On:25 Oct 2019 14:16

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