Boletín de la Sociedad Geológica Mexicana Volumen 68, núm. 3, 2016, p. 515‒536 http://dx.doi.org/10.18268/BSGM2016v68n3a8

Late Jurassic aptychi from the La Caja Formation of northeastern Mexico

Patrick Zell¹, Wolfgang Stinnesbeck², Seija Beckmann²

¹ Hessisches Landesmuseum Darmstadt, Friedensplatz 1, 64283 Darmstadt, Germany.
² Institut für Geowissenschaften, Universität Heidelberg, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany.

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Abstract

Five taxa of Kimmeridgian to Tithonian (Upper Jurassic) aptychi are here described from the La Caja Formation of northeastern Mexico. Laevaptychus (Latuslaevaptychus) latus meyrati Trauth, 1931, L. (Hoplisuslaevaptychus) mexicanus (Castillo and Aguilera, 1895), L. (Autharislaevaptychus) favrei Trauth, 1931, Lamellaptychus lamellosus (Parkinson, 1811) and Lam. murocostatus Trauth, 1929 were previously known from the Tethyan Realm. In northeastern Mexico, records of Lamellaptychus are restricted to the upper lower Kimmeridgian–lower upper Tithonian, while Laevaptychusis presently restricted to the uppermost Kimmeridgian–uppermost Tithonian.

Keywords: Ammonites, aptychi, Late Jurassic, northeastern Mexico.