Revista mexicana de ciencias geológicas On-line version ISSN 2007-2902Print version ISSN 1026-8774
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BLAU, Joachim; MEISTER, Christian; SCHMIDT-EFFING, Reinhard and VILLASENOR, Ana B..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. Rev. mex. cienc. geol [online]. 2008, vol.25, n.3, pp.402-407.
ISSN 2007-2902.