Cretaceous Research 88 (2018) 100e110
Contents lists available at ScienceDirect
Cretaceous Research journal homepage: www.elsevier.com/locate/CretRes
n section (Durango Ammonite biostratigraphy of the Sierra del Patro State, Mexico) and its bearing on the lower/upper Aptian boundary of the Central Atlantic Province vez Cabello e, J.A. Moreno-Bedmar a, *, A. Casados-Monroy b, C. Frau c, A. Pictet d, G. Cha f C. Esquivel-Macías n, 04510, Mexico noma de M Instituto de Geología, Universidad Nacional Auto exico, Ciudad Universitaria, Ciudad de M exico, Coyoaca n, 93390, Poza Rica, Veracruz, Mexico Calle Emiliano Zapata #112, Revolucio Groupement d'Int er^ et Pal eontologique, Science et Exposition, 60 bd Georges Richard, 83000 Toulon, France d Department of Earth Sciences, 13 Rue des Maraîchers, 1205 Geneva, Switzerland e noma de Nuevo Leo n, Facultad de Ciencias de la Tierra Ex e Hacienda de Guadalupe, Linares, N.L., A.P. 104, C.P. 67700, Mexico Universidad Auto f gicas, Universidad Auto noma del Estado de Hidalgo, Pachuca, 42184, Mexico Centro de Investigaciones Biolo a
b c
a r t i c l e i n f o
a b s t r a c t
Article history: Received 29 January 2017 Received in revised form 29 September 2017 Accepted in revised form 21 October 2017 Available online 21 October 2017
~ a Formation from the la Sierra del The present contribution documents the ammonite record of the La Pen n (Durango State, Mexico). Twenty one taxa have been recognized among the 354 specimens Patro collected bed-by-bed. Our biostratigraphic analysis of the ammonite distribution allow us to improve the zonation for the transition of the lower/upper Aptian boundary of northeast Mexico, composed of the upper lower Aptian Dufrenoyia justinae interval Zone (including the Dufrenoyia scotti/Burckhardtites nazasensis concurrent range Subzone at its top) and the lower upper Aptian Caseyella aguilerae interval Zone (including the Gargasiceras? adkinsi total range Subzone at its base). The lower/upper Aptian boundary is herein well characterized by means of endemic or quasi-endemic taxa and a strong ammonite faunal turnover marked by a renewal at the generic and family levels comparable with those of the Mediterranean-Caucasian regions (end of Deshayesitidae balanced by the renewal in the doun villeiceratid, desmoceratid and acanthohoplitid stocks). The proposed zonation of the Sierra del Patro section is an important step forward in the development of the Aptian zonation for the Central Atlantic Province and its correlation with the Standard Mediterranean ammonite zonation. © 2017 Elsevier Ltd. All rights reserved.
Keywords: Ammonite Biostratigraphy Aptian Cretaceous Durango Mexico
1. Introduction A standard ammonite zonation for the Central Atlantic Province, i.e. the southern part of North and Central America (e.g. MorenoBedmar et al., 2015), is currently being developed through several contributions focused on the Early Cretaceous ammonites of lez-Arreola et al., Mexico (e.g. Moreno-Bedmar et al., 2013; Gonza 2014; Reboulet et al., 2014; Frau et al., 2015; Moreno-Bedmar et al., 2015; Ovando-Figueroa et al., 2015; Zell et al., 2015; n et al., 2016). In some of these contributions part of the Barraga
* Corresponding author. E-mail addresses:
[email protected] (J.A. Moreno-Bedmar),
[email protected] (A. Casados-Monroy),
[email protected] (C. Frau),
[email protected] (A. Pictet),
[email protected] (G. Ch avez Cabello),
[email protected] (C. Esquivel-Macías). https://doi.org/10.1016/j.cretres.2017.10.015 0195-6671/© 2017 Elsevier Ltd. All rights reserved.
taxonomy of Early Cretaceous Mexican ammonites have been revised and updated, but much more biostratigraphic data will be necessary in order to build a standard ammonite zonation. Regarding to the Aptian Stage in Mexico, Moreno-Bedmar et al. (2013, 2015) recently focused on the Francisco Zarco Dam (Durango State) and the Mina Texali (Puebla State) sections of northeast and central Mexico, respectively. The authors highlighted that the substantial endemism of ammonite assemblages of the Mexican sections supports the elaboration of an independent zonation across the lower/upper Aptian boundary. Unfortunately, both contributions lack a clear definition of this boundary due to the absence of a deep renewal in the douvilleiceratid stock which actually defines the corresponding boundary in the MediterraneanCaucasian regions (see discussion in Moreno-Bedmar et al., 2015, p. 206). The present work complements the ammonite record of the n (¼ SP) Durango State through the study of the Sierra del Patro
