Life and death in a submarine volcanic ash dune: the case of a group of patagonian miocene echinoids

• Autores: Palópolo, Evangelina Elizabeth; Casadio, Silvio Alberto; Kroh, Andreas; Harzhauser, Mathias; Griffin, Miguel
• Año de publicación: 2019
• Idioma: inglés
• Tipo de recurso: documento de conferencia
• Materia: Ciencias Exactas y Naturales; Life and Death; Submarine Volcanic; Patagonian Miocene Echinoids; Ciencias Exactas y Naturales
• Institución: Universidad Nacional de Río Negro

Fil: Palópolo, Evangelina. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro. Argentina.
Fil: Casadio, Silvio. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro. Argentina.
Fil: Kroh, Andreas. Naturhistorisches Museum Wien (NHMW). Austria.
Fil: Harzhauser, Mathias. Naturhistorisches Museum Wien (NHMW). Austria.
Fil: Griffin, Miguel. División Paleontología de Invertebrados, Unidades de Investigación Anexo Museo. Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata. Argentina.
Early Miocene sedimentary rocks of the lower part of the Monte Leon Formation are locally very fossiliferous. Echinoids of the heart urchin family Schizasteridae were collected from outcrops exposed along National Route 3, North of Puerto San Julián, Province of Santa Cruz (48.956°S?67.648°W). The dominant component of the sedimentary rock is pyroclastic material consisting mainly of shards and volcanically derived clays. The succession containing the bed with echinoids can be interpreted to be the result of sedimentation in a subtidal environment. Sedimentary structures and the trace-fossil suite indicate actively migrating large-scale bedforms in an open-marine setting, in which tidal currents were the dominant sedimentary processes. Extensive colonization by echinoids is interpreted as associated with lower dune migration rate. The bioturbation in the bottomset deposits suggests that the colonization window was relatively long. The fossils studied herein are almost complete and moderately to well-preserved, many of them were found in life position and retain part of their spine cover, suggesting the echinoids were buried in life or within a few days after death. The presence of manganese and iron oxides suggests a high content of organic matter within a suboxic to anoxic environment and is coincident with the strong reaction of the sediment when exposed to peroxide hydrogen. The statistical analysis of echinoids positions in the sedimentary bed showed a clustered distribution, with two dense clusters of echinoids and isolated echinoids between them, suggesting that there could have been variations in sediment organic matter content or competition for space.