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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Autónoma de Baja California
2000
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| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=48026110 |
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- Biostratigraphy and depositional history of the tepetate formation at arroyo colorado (early-middle eocene), Baja California Sur, Mexico Ana Luisa Carreño Rosalía Guerrero Arenas Jorge Ledesma Vázquez Ciencias de la Tierra Eocene Mexico biostratigraphy Tepetate Formation Baja California Sur An integrated study of Foraminifera, Ostracoda and lithostratigraphy was conducted on samples ofthe Tepetate Formation from the Arroyo Colorado locality, Baja California Sur (Mexico). Based on theplanktonic 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. BenthicForaminifera suggest correlation with the Penutian to Narizian California stages, which agrees with theplanktonic foraminiferal biozones. The sedimentary structures and microfossils throughout the sequenceindicate deposition within a transgressive-regressive-transgressive cycle, including environments fromthe inner to outer marine shelf in depths shallower than 150 m. Gravity flows dominate the sequence, andstorm-deposited beds are present in the middle of the section. Considering the nature of this formationalunit, we recommend the designation of a composite stratotype, according to the North AmericanStratigraphic Code. 2000 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48026110 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.1 Vol.26