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Abstract
AAPG Memoir 75, Chapter 17: The
Cretaceous-Paleocene Boundary in the Subsurface Campeche Shelf, Southern Gulf of Mexico,
by Abelardo Cant-Chapa and Romn Landeros-Flores, Pages 389 - 395
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 Cant-Chapa
Copyright 2001 by The American Association
of Petroleum Geologists. All rights reserved.
The Cretaceous-Paleocene Boundary in the Subsurface
Campeche Shelf, Southern Gulf of Mexico
Abelardo Cant-Chapa
Instituto Politcnico Nacional, Mexico City, Mexico
Romn Landeros-Flores (deceased)
Petrleos
Mexicanos, Ciudad del Carmen, Campeche, Mexico
Dedicated to Mr. Rudecindo Cantarell, a fisherman who discovered and reported the
existence of oil seeps in waters of the Campeche Shelf.
ABSTRACT
The Cretaceous-Paleocene boundary on the Campeche
Shelf is established with planktonic foraminiferal biostratigraphy from core and chip
samples and is correlated with gamma-ray well logs. The Campanian-Maestrichtian Cantarell
Formation is herein formally described as a breccia formed of calcareous or dolomitized
fragments cemented by micrite. Its age is established using Globotruncana
species. The Abkatun Formation is formally described as brown shale and shaly limestone
that contains Parvularugoglobigerina trinidadensis and Pa. pseudobulloides
of the lower Paleocene. The upper Paleocene is represented by greenish-gray shale that
contains Morozovella velascoensis, M. formosa formosa, M. aragonensis, and Globoanomalina
pseudomenardii.
The broad regional distribution and distinctive lithology of the Cantarell and Abkatun
Formations allow them to be differentiated from overlying and underlying formations. The
boundary between the lower and upper Paleocene is conformable.
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