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Maastrichtian inoceramid bivalves from central Chiapas, southeastern Mexico

Gloria Alencaster and Lourdes Omana
Maastrichtian inoceramid bivalves from central Chiapas, southeastern Mexico
Journal of Paleontology (September 2006) 80 (5): 946-957


In central Chiapas (southeastern Mexico) the last occurrence of inoceramid bivalves was recorded in strata of the predominantly terrigenous Ocozocoautla Formation. The inoceramids are associated with foraminifers of the Gansserina gansseri Zone (Late Campanian to Early Maastrichtian). The described species are: Cataceramus? cf. barabini (Morton, 1834), Cataceramus? cf. subcircularis (Meek, 1876), Trochoceramus aff. costaecus (Khalafova, 1966), Trochoceramus nahorianensis (Kociubynskij, 1968), and Trochoceramus tricostatus n. sp. Based on the inoceramid and foraminifer species present, the assemblage is assigned to the Early Maastrichtian. This age is important because at this level most of the typical inoceramids globally disappeared. This is the first report of the genus Trochoceramus in Mexico, which is a good index fossil for the Early Maastrichtian and has a cosmopolitan distribution.

ISSN: 0022-3360
EISSN: 1937-2337
Serial Title: Journal of Paleontology
Serial Volume: 80
Serial Issue: 5
Title: Maastrichtian inoceramid bivalves from central Chiapas, southeastern Mexico
Affiliation: National Autonomous University of Mexico, Institute of Geology, Mexico City, Mexico
Pages: 946-957
Published: 200609
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 92
Accession Number: 2006-079858
Categories: StratigraphyInvertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 1 plate, 5 tables, geol. sketch maps
N16°46'00" - N16°46'00", W93°04'60" - W93°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, The Paleontological Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200645
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