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Revista mexicana de ciencias geológicas
On-line version ISSN 2007-2902Print version ISSN 1026-8774
Rev. mex. cienc. geol vol.22 n.1 Ciudad de México Apr. 2005
Artículos
Towards a standard ammonite zonation for the Aptian (Lower Cretaceous) of northern Mexico
Hacia una zonación estándar de ammonites para el Aptiano (Cretácico Inferior) del norte de México
1Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, D. F., Mexico. ricardor@geologia.unam.mx
Detailed data on twenty-seven species of ammonites identified in three stratigraphic sections of northern Mexico, allow further refinement of the Aptian ammonite biozonations of previous authors. Four formal ammonite biozones are proposed. Dufrenoyia justinae Taxon-Range-Zone for the uppermost part of the lower Aptian (Bedoulian), Epicheloniceras cf. subnodosocostatum/Acanthohoplites acutecosta Interval Zone representative of the middle Aptian (Gargasian), and Acanthohoplites aschiltaensis and Hypacanthoplites cf. leanzae Taxon-Range -Zones, spanning the upper Aptian (Clansayesian). The ammonite zonation proposed represents the advancements on the development of a standard scheme towards a reliable correlation with the biozonal scheme of England and the ammonite zonal standard of the Mediterranean area.
Key words: biostratigraphy; ammonites; Aptian; Mexico
Estudios detallados de veintisiete especies de ammonites provenientes de tres secciones estratigráficas del norte de México, permiten redefinir los esquemas biozonales del Aptiano, establecidos previamente por otros autores para el área, con base en la distribución vertical de estos macrofósiles. En este trabajo se proponen cuatro biozonas formales de ammonites. La Zona de Rango Dufrenoyia justinae para la parte terminal del Aptiano inferior (Bedouliano), la Zona de Intervalo Epicheloniceras cf. subnodosocostatum/Acanthohoplites acutecosta representativa del Aptiano medio (Gargasiano) y las Zonas de Rango Acanthohoplites aschiltaensis e Hypacanthoplites cf. leanzae, características del Aptiano superior (Clansayesian). La biozonación de ammonites propuesta representa los avances en el desarrollo de un esquema estandarizado con miras a realizar correlaciones más precisas con los esquemas biozonales desarrollados para Inglaterra y el área Mediterránea.
Palabras clave: bioestratigrafía; ammonites; Aptiano; México
ACKNOWLEDGMENTS
This work was supported by SEP-CONACYT grant number 40337-7. The authors are deeply indebted to Dr. Florentin Maurrasse and Gilberto Nieto for their invaluable help in the field work. We wish to thank the Institute of Geology of the Universidad Nacional Autónoma de México for facilitating the field work and providing the facilities for the curatorial and systematic analyses.
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Received: December 10, 2003; Revised: September 13, 2004; Accepted: October 04, 2004