Biostratigraphy and depositional history of the tepetate formation at Arroyo Colorado (Early-Middle Eocene), Baja California Sur, Mexico

Biostratigraphy and depositional history of the tepetate formation at Arroyo Colorado (Early-Middle Eocene), Baja California Sur, Mexico

 An integrated study of Foraminifera, Ostracoda and lithostratigraphy was conducted on samples of the Tepetate Formation from the Arroyo Colorado locality, Baja California Sur (Mexico). Based on the planktonic Foraminifera, Acarinina pentacamerata (latest lower Eocene) and Hantkenina nuttal...

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Autores principales: Carreño, AL, Ledesma-Vázquez, J, Guerrero-Arenas, R
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2000
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/565
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spelling oai:cienciasmarinas.com.mx:article-5652019-05-14T17:42:41Z Biostratigraphy and depositional history of the tepetate formation at Arroyo Colorado (Early-Middle Eocene), Baja California Sur, Mexico Bioestratigrafía e historia deposicional de la formación Tepetate en el arroyo Colorado (Eoceno medio-temprano), Baja California Sur, México Carreño, AL Ledesma-Vázquez, J Guerrero-Arenas, R Eocene Baja California Sur Mexico Tepetate Formation biostratigraphy Eoceno Baja California Sur México Formación Tepetate bioestratigrafía  An integrated study of Foraminifera, Ostracoda and lithostratigraphy was conducted on samples of the Tepetate Formation from the Arroyo Colorado locality, Baja California Sur (Mexico). Based on the planktonic Foraminifera, Acarinina pentacamerata (latest lower Eocene) and Hantkenina nuttalli (earliest middle Eocene) zones were recognized that indicate an age range from 51.2 to 48.4 Ma. Benthic Foraminifera suggest correlation with the Penutian to Narizian California stages, which agrees with the planktonic foraminiferal biozones. The sedimentary structures and microfossils throughout the sequence indicate deposition within a transgressive-regressive-transgressive cycle, including environments from the inner to outer marine shelf in depths shallower than 150 m. Gravity flows dominate the sequence, and storm-deposited beds are present in the middle of the section. Considering the nature of this formational unit, we recommend the designation of a composite stratotype, according to the North American Stratigraphic Code. Se llevó a cabo un análisis integrado de foraminíferos, ostrácodos y litoestratigrafía de muestras de la Formación Tepetate provenientes de la localidad de Arroyo Colorado, Baja California Sur (México). Con base en foraminíferos planctónicos, se reconocen las zonas de Acarinina pentacamerata y Hantkenina nuttalli del Eoceno inferior tardío y del Eoceno medio temprano, respectivamente, indicando una edad de 51.2 a 48.4 Ma para la secuencia. Los foraminíferos bentónicos de la secuencia indican que ésta queda incluida en los pisos clásicos para California del Penutiano al Nariziano, coincidiendo con la edad proporcionada por los foraminíferos planctónicos. Las estructuras sedimentarias y los conjuntos de microfósiles a través de la secuencia indican depósito dentro de un ciclo transgresivo-regresivo-transgresivo, a profundidades no mayores que 150 m, en un mar desde somero hasta el límite exterior de la plataforma. Flujos gravitacionales caracterizan a la secuencia y en la parte media de la sección se encuentran evidencias de eventos de tormenta. Debido a la naturaleza de esta unidad formacional, se recomienda la designación de un estratotipo compuesto de acuerdo con el North American Stratigraphic Code. Iniversidad Autónoma de Baja California 2000-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/565 10.7773/cm.v26i1.565 Ciencias Marinas; Vol. 26 No. 1 (2000); 177-200 Ciencias Marinas; Vol. 26 Núm. 1 (2000); 177-200 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/565/502
institution Ciencias Marinas
collection OJS
language eng
format Online
author Carreño, AL
Ledesma-Vázquez, J
Guerrero-Arenas, R
spellingShingle Carreño, AL
Ledesma-Vázquez, J
Guerrero-Arenas, R
Biostratigraphy and depositional history of the tepetate formation at Arroyo Colorado (Early-Middle Eocene), Baja California Sur, Mexico
author_facet Carreño, AL
Ledesma-Vázquez, J
Guerrero-Arenas, R
author_sort Carreño, AL
title Biostratigraphy and depositional history of the tepetate formation at Arroyo Colorado (Early-Middle Eocene), Baja California Sur, Mexico
title_short Biostratigraphy and depositional history of the tepetate formation at Arroyo Colorado (Early-Middle Eocene), Baja California Sur, Mexico
title_full Biostratigraphy and depositional history of the tepetate formation at Arroyo Colorado (Early-Middle Eocene), Baja California Sur, Mexico
title_fullStr Biostratigraphy and depositional history of the tepetate formation at Arroyo Colorado (Early-Middle Eocene), Baja California Sur, Mexico
title_full_unstemmed Biostratigraphy and depositional history of the tepetate formation at Arroyo Colorado (Early-Middle Eocene), Baja California Sur, Mexico
title_sort biostratigraphy and depositional history of the tepetate formation at arroyo colorado (early-middle eocene), baja california sur, mexico
description  An integrated study of Foraminifera, Ostracoda and lithostratigraphy was conducted on samples of the Tepetate Formation from the Arroyo Colorado locality, Baja California Sur (Mexico). Based on the planktonic Foraminifera, Acarinina pentacamerata (latest lower Eocene) and Hantkenina nuttalli (earliest middle Eocene) zones were recognized that indicate an age range from 51.2 to 48.4 Ma. Benthic Foraminifera suggest correlation with the Penutian to Narizian California stages, which agrees with the planktonic foraminiferal biozones. The sedimentary structures and microfossils throughout the sequence indicate deposition within a transgressive-regressive-transgressive cycle, including environments from the inner to outer marine shelf in depths shallower than 150 m. Gravity flows dominate the sequence, and storm-deposited beds are present in the middle of the section. Considering the nature of this formational unit, we recommend the designation of a composite stratotype, according to the North American Stratigraphic Code.
publisher Iniversidad Autónoma de Baja California
publishDate 2000
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/565
_version_ 1715723983911911424

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