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Abstract

AAPG Memoir 75, Chapter 15: The Taraises Formation (Berriasian-Valanginian) in Northeastern Mexico: Subsurface and Outcrop Studies, by Abelardo Cant250_u.jpg (467 bytes)-Chapa, Pages 353 - 370
from:
AAPG Memoir 75: The Western Gulf of Mexico Basin: Tectonics, Sedimentary Basins, and Petroleum Systems, Edited by Claudio Bartolini, Richard T. Buffler, and Abelardo Cant250_u.jpg (467 bytes)-Chapa
Copyright copyrght.jpg (4253 bytes)2001 by The American Association of Petroleum Geologists. All rights reserved.

The Taraises Formation (Berriasian-Valanginian) in Northeastern Mexico: Subsurface and Outcrop Studies

Abelardo Cant250_u.jpg (467 bytes)-Chapa
Instituto Polit233_e.jpg (471 bytes)cnico Nacional, Mexico City, Mexico

ABSTRACT

The Berriasian-Valanginian Taraises Formation in the subsurface of northeastern Mexico consists of an intercalation of argillaceous limestone and shale. This formation is divided into two members, based on lithologic characteristics defined from electric and radioactivity logs from oil wells in northeastern Mexico. In addition, two small ammonite groups of the subfamily Olcostephaninae (upper Valanginian) collected at Potrero de Garc237_i.jpg (445 bytes)a, Nuevo Le243_o.jpg (458 bytes)n, northeastern Mexico, are described: (1) Capeloites neoleonense n. sp. and (2) Garcites potrerensis n. gen. and sp. and G. cavernensis n. gen. and sp. The presence of Dichotomites (Dichotomites) sp. in the same beds supports an late Valanginian age for these strata. One specimen of Capeloites obtained from a core of the La Laja-8 well, south of Tampico City, eastern Mexico, designates an late Valanginian age for the interval drilled (2556-2562 m) in the so-called Lower Tamaulipas Formation in this area. Global geographic distribution of Capeloites is restricted to France, Spain, and Peru; its presence in Mexico supports a biogeographic link between Europe and America.

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