Trazas fósiles en barras submareales de la Formación Balcarce (Cámbrico/Ordovicico), Cabo Corrientes, Mar del Plata, Argentina

Cambrian/Ordovician trace fossil assemblages from the Balcarce Formation are described. In the Cabo Corrientes outcrops at the Atlantic coast, four sedimentary facies are distinguished as follows: a) Pebble Sandstone Facies with progradation surfaces and no evidence of bioturbation; b) Crossbedded S...

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Autores principales:	Poiré, Daniel Gustavo, Del Valle, Analía
Formato:	Articulo
Lenguaje:	Español
Publicado:	1996
Materias:	Paleontología Trace fossils Sedimentary facies Shallow marine deposits Cambrian-Ordovician Balcarce formation Tandilia Argentina Trazas fósiles Facies sedimentarias Marino somero Cambro-Ordovícico
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/115945 https://www.peapaleontologica.org.ar/index.php/peapa/article/view/169
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-115945
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Español
topic	Paleontología Trace fossils Sedimentary facies Shallow marine deposits Cambrian-Ordovician Balcarce formation Tandilia Argentina Trazas fósiles Facies sedimentarias Marino somero Cambro-Ordovícico
spellingShingle	Paleontología Trace fossils Sedimentary facies Shallow marine deposits Cambrian-Ordovician Balcarce formation Tandilia Argentina Trazas fósiles Facies sedimentarias Marino somero Cambro-Ordovícico Poiré, Daniel Gustavo Del Valle, Analía Trazas fósiles en barras submareales de la Formación Balcarce (Cámbrico/Ordovicico), Cabo Corrientes, Mar del Plata, Argentina
topic_facet	Paleontología Trace fossils Sedimentary facies Shallow marine deposits Cambrian-Ordovician Balcarce formation Tandilia Argentina Trazas fósiles Facies sedimentarias Marino somero Cambro-Ordovícico
description	Cambrian/Ordovician trace fossil assemblages from the Balcarce Formation are described. In the Cabo Corrientes outcrops at the Atlantic coast, four sedimentary facies are distinguished as follows: a) Pebble Sandstone Facies with progradation surfaces and no evidence of bioturbation; b) Crossbedded Sandstone Facies in tabular and lenticular sand bodies with rare Palaeophycus isp.; c) Heterolithic Facies with wavy bedding bearing Daedalus labeckei, Herradurichnus scagliai, Rusophycus isp.. Scolicia isp., and Teichichnus isp.; and d) Sandy Heterolithic Facies with Herradurichnus scagliai and Scalicia isp. This sedimentary succession is considered here as interbar, bar margin, and central bar facies in a subtidal environment on an open marine shelf. Ethologically, two principal trace fossil assemblages are recognised. Both assemblages are closely associated with sedimentary facies and specific colonising events may be distinguished. The first assemblage consists of Rusophycus isp. and Herradurichnus scagliai, which occur as furrows on the substrate at the water-sediment interface. The second one is composed of Daedalus labeckei, Scalicia isp. and Teichichnus isp., which are post-depositional burrows developed a few centimeters below the sediment surface by sediment feeding organisms. From this study, the palaeoenvironmental history of the bioturbation of this shelf bar deposit can be summarised. Firstly synsedimentary ichnofossils developed in interbar and bar margin heterolithic deposits. Secondly, these deposits were buried by vertical accretion of migrating sand waves, and then mud feeding organisms started working below the sediment surface living on the available nutrients in the wavy bedded heterolithic facies. Simultaneously, in the overlying new interbar and bar margin facies similar syndepositational traces were developed.Cambrian/Ordovician trace fossil assemblages from the Balcarce Formation are described. In the Cabo Corrientes outcrops at the Atlantic coast, four sedimentary facies are distinguished as follows: a) Pebble Sandstone Facies with progradation surfaces and no evidence of bioturbation; b) Crossbedded Sandstone Facies in tabular and lenticular sand bodies with rare Palaeophycus isp.; c) Heterolithic Facies with wavy bedding bearing Daedalus labeckei, Herradurichnus scagliai, Rusophycus isp.. Scolicia isp., and Teichichnus isp.; and d) Sandy Heterolithic Facies with Herradurichnus scagliai and Scalicia isp. This sedimentary succession is considered here as interbar, bar margin, and central bar facies in a subtidal environment on an open marine shelf. Ethologically, two principal trace fossil assemblages are recognised. Both assemblages are closely associated with sedimentary facies and specific colonising events may be distinguished. The first assemblage consists of Rusophycus isp. and Herradurichnus scagliai, which occur as furrows on the substrate at the water-sediment interface. The second one is composed of Daedalus labeckei, Scalicia isp. and Teichichnus isp., which are post-depositional burrows developed a few centimeters below the sediment surface by sediment feeding organisms. From this study, the palaeoenvironmental history of the bioturbation of this shelf bar deposit can be summarised. Firstly synsedimentary ichnofossils developed in interbar and bar margin heterolithic deposits. Secondly, these deposits were buried by vertical accretion of migrating sand waves, and then mud feeding organisms started working below the sediment surface living on the available nutrients in the wavy bedded heterolithic facies. Simultaneously, in the overlying new interbar and bar margin facies similar syndepositational traces were developed.
format	Articulo Articulo
author	Poiré, Daniel Gustavo Del Valle, Analía
author_facet	Poiré, Daniel Gustavo Del Valle, Analía
author_sort	Poiré, Daniel Gustavo
title	Trazas fósiles en barras submareales de la Formación Balcarce (Cámbrico/Ordovicico), Cabo Corrientes, Mar del Plata, Argentina
title_short	Trazas fósiles en barras submareales de la Formación Balcarce (Cámbrico/Ordovicico), Cabo Corrientes, Mar del Plata, Argentina
title_full	Trazas fósiles en barras submareales de la Formación Balcarce (Cámbrico/Ordovicico), Cabo Corrientes, Mar del Plata, Argentina
title_fullStr	Trazas fósiles en barras submareales de la Formación Balcarce (Cámbrico/Ordovicico), Cabo Corrientes, Mar del Plata, Argentina
title_full_unstemmed	Trazas fósiles en barras submareales de la Formación Balcarce (Cámbrico/Ordovicico), Cabo Corrientes, Mar del Plata, Argentina
title_sort	trazas fósiles en barras submareales de la formación balcarce (cámbrico/ordovicico), cabo corrientes, mar del plata, argentina
publishDate	1996
url	http://sedici.unlp.edu.ar/handle/10915/115945 https://www.peapaleontologica.org.ar/index.php/peapa/article/view/169
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Trazas fósiles en barras submareales de la Formación Balcarce (Cámbrico/Ordovicico), Cabo Corrientes, Mar del Plata, Argentina

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