NDLI: Biofacies de trilobites cámbricos en la Formación Alojamiento, Precordillera de San Juan y Mendoza, Argentina

Please wait, while we are loading the content...

Biofacies de trilobites cámbricos en la Formación Alojamiento, Precordillera de San Juan y Mendoza, Argentina

Content Provider	Semantic Scholar
Author	Bordonaro, Osvaldo Luis Banchig, Aldo Luis
Copyright Year	2007
Abstract	Resumen. Se realiza una interpretacion biofacial con trilobites del Cambrico Medio hallados en los carbonatos de la Formacion Alojamiento de la Precordillera de San Juan y Mendoza, Argentina. Se aplica el concepto de bioestratigrafia dual que define a las biofacies como unidades estratigraficas bioticas informales caracterizadas por taxones mayores. La Biofacies de Alokistocaridae esta integrada por un 10 % de polimeridos de la familia Alokistocaridae contenidos en grainstones y packstones aflorantes en el cordon de Santa Clara (San Juan) y representa un ambiente de alta energia interpretado como bajios o barras de borde de plataforma. La Biofacies de Peronopsis esta compuesta por ~25% de agnostidos del genero Peronopsis incluidos en packstones y wackestones expuestos en la quebrada de Aguilera en el cordon del Alojamiento (Mendoza), que caracterizan una plataforma externa relativamente somera. La Biofacies de Ptychagnostus esta definida por un ~30% de agnostidos del genero Ptychagnostus alojados en mudstones y calcipelitas que afloran en la quebrada del Leon del cordon del Alojamiento (Mendoza) y responde a una plataforma externa profunda. Tanto las litofacies como las biofacies permiten reconocer un incremento batimetrico en sentido Este-Oeste, desde un borde somero de plataforma interna hasta una plataforma externa profunda. Dentro de cada biofacies se reconocen las Zonas de Ehmaniella, Oryctocephalus y Ptychagnostusgibbus que indican el Marjumiano Temprano. Abstract: CAMBRIAN TRILOBITE BIOFACIES IN THE ALOJAMIENTO FORMATION, PRECORDILLERA OF SAN JUAN AND MENDOZA, ARGENTINA. Several Middle Cambrian trilobite biofacies are defined from limestones of the Alojamiento Formation in the San Juan and Mendoza, Precordillera, Argentina. This study is based on the concept of dual biostratigraphy that defines biofacies as an informal biotic stratigraphic unit of environmental significance characterized by associations of higher taxa. The Alokistocaridae Biofacies is composed of 10% polymeroids of the Alokistocaridae family representing high energy shoal water grainstones-packstones from the ckordon de Santa Clara (San Juan). The Peronopsis Biofacies is composed of ~25% of the agnostoid Peronopsis occurring in outer platform shallow subtidal packstones-wackestones exposed in the quebrada of Aguilera in the cordon del Alojamiento (Mendoza). The Ptychagnostus Biofacies is defined by ~30% of the agnostoid Ptychagnostus found in outer-platform deep subtidal mudstones-calcipelites cropping out in the Leon Creek, cordon del Alojamiento (Mendoza). Both biofacies and lithofacies show an East-West bathymetric increase from shallow inner-platform to deep outer-platform settings. The Ehmaniella, Oryctocephalus and Ptychagnostusgibbus Zones recognised within each biofacies indicate an Early Marjumian age.
Starting Page	91
Ending Page	107
Page Count	17
File Format	PDF HTM / HTML
Volume Number	44
Alternate Webpage(s)	http://www.ameghiniana.org.ar/index.php/ameghiniana/article/download/676/1409
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

Central Library (ISO-9001:2015 Certified)
Indian Institute of Technology Kharagpur
Kharagpur, West Bengal, India | PIN - 721302

See location in the Map
03222 282435
Mail: support@ndl.gov.in

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in