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- Title
Maastrichtian cephalopods from Cerralvo, north-eastern Mexico.
- Authors
Ifrim, Christina; Stinnesbeck, Wolfgang; López-Oliva, José Guadalupe
- Abstract
Sediments of the Méndez Formation near Cerralvo, north-eastern Mexico, yield an abundant and diverse Maastrichtian ammonite assemblage. A total of 23 species referred to 18 genera are described, in addition to the possible coleoidNaefia neogaeia. The assemblage is considered to be of early Maastrichtian age on the basis of ammonite occurrences and has been dated to the lower Maastrichtian biozone CF 7 by planktic foraminifera. None of the ammonite species has been reported previously from the Méndez Formation and most species are recorded from Mexico for the first time. In addition to faunal elements known from other Gulf of Mexico localities [Baculites ovatus,Nostoceras(N.)alternatum,N.(N.)colubriformis,N.(N.)rugosum,Solenoceras reesidei] the assemblage is characterized by cosmopolitan (e.g.Anagaudryceras politissimum,Desmophyllites diphylloides,Diplomoceras cylindraceum,Gaudryceras kayei,Phyllopachyceras forbesianum, andPseudophyllites indra) and Tethyan elements [e.g.Brahmaites(Anabrahmaites)vishnu,Fresvillia constricta,Hauericeras rembda,Solenoceras texanum, Tetragonites superstes]. Some ammonite species have been known from the Indopacific region a [e.g.Fresvilliaaff.F. teres,Neophylloceras(Hypophylloceras)hetonaiense,Zelandites varuna] and are clearly cold-water species. The composition of the assemblage contrasts with other Gulf of Mexico faunas which is related to bathymetry.
- Subjects
CERRALVO Island (Mexico); MEXICO; MOLLUSKS; SQUIDS; AMMONOIDEA
- Publication
Palaeontology, 2004, Vol 47, Issue 6, p1575
- ISSN
0031-0239
- Publication type
Article
- DOI
10.1111/j.0031-0239.2004.00426.x