Upper Campanian (Upper Cretaceous) cephalopods from the Parras Shale near Saucedas, Coahuila, Mexico

The Upper Campanian – lower Maastrichtian cephalopod fauna of Botellos, Nuevo León: a key to understand faunal turnover across the Campanian–Maastrichtian boundary in NE Mexico

“…An ammonite faunal turnover can be demonstrated when comparing the Botellos assemblage quantitatively with the upper Campanian assemblage from Saucedas (Ifrim et al 2015b) and the lower Maastrichtian assemblage from south of Cerralvo (Ifrim et al 2004). The palaeobiogeographic terminology is based on Westermann (2000) …”

“…Order Coleoidea Bather, 1888 Longibelus sp., (= Naefia neogaeia by Ifrim et al 2004, re-discussed by Fuchs et al 2013) Order Ammonoidea von Zittel, 1884 Ifrim et al 2004;Ifrim et al 2005;Ifrim et al 2015b) and worldwide (grey) in localities mentioned in the text. The ranges of the Botellos taxa are marked in blue, the one of the upper Campanian Saucedas assemblage in streaks.…”

“…A formal description of most of the Botellos taxa can be found in earlier publications on late Campanian-Maastrichtian cephalopods with similar preservation (Ifrim et al 2004;2015b; and is therefore not repeated here. Instead, the systematic palaeontology is abbreviated to a list of species and the numbers of specimens found and their occurrence, summarized in Text- fig.…”

“…APPENDIX: Table 1. Upper Campanian and Maastrichtian species from North-eastern Mexico and from Tercis, the type section for the CampanianMaastrichtian boundary, with number of specimens found and share of individuals in the assemblage, sorted after locality and age (data from Tercis from ; data from Mexican localities other than Botellos from Ifrim et al 2004Ifrim et al , 2005Ifrim et al , 2015b Unauthenticated Download Date | 5/12/18 6:08 PM…”

“…Each assemblage provided insight into faunal dynamics during isolated time slices of the late Campanian and early Maastrichtian of NE Mexico. The Upper Cretaceous of the region turned out to be a "crossroad" between major ammonite provinces (Ifrim et al 2004(Ifrim et al , 2005(Ifrim et al , 2015bStinnesbeck 2007, 2008) and regarding other marine organisms (Ifrim and Stinnesbeck 2007;Vega et al 2007;Fuchs et al 2010;Giersch et al 2011;2014).…”