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1.
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A new fossiliferous site of Lower Liassic (Upper Sinemurian) marine sediments from the southern Sierra Madre Oriental (Puebla, Mexico): ammonite fauna, biostratigraphy, and description of Ectocentrites hillebrandti new species Blau,Joachim - Meister,Christian - Schmidt-Effing,Reinhard - Villaseñor,Ana B.
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Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implications Barragán,Ricardo - Maurrasse,Florentin J-M. R.
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