. Bulletins of American paleontology. Mexican ammonites: Verma & Westermann 269. Text-fig. 31. — Geographic distribution of Upper Tithonian ammonite genera (as indicated) known from the Sierra Catorce. Areas of maximal marine transgression are dotted. (Distribution of continents modified after Wilson, 1963; Smith and Hallam, 1970). Mazapilites and Haploceras in the Sierra Catorce. A global com- parison at the species level indicates that the Sierra Catorce fauna is most closely affiliated with the Tithonian fauna of Argentina while Mediterranean affinities are somewhat more distant. Boreal
. Bulletins of American paleontology. Mexican ammonites: Verma & Westermann 269. Text-fig. 31. — Geographic distribution of Upper Tithonian ammonite genera (as indicated) known from the Sierra Catorce. Areas of maximal marine transgression are dotted. (Distribution of continents modified after Wilson, 1963; Smith and Hallam, 1970). Mazapilites and Haploceras in the Sierra Catorce. A global com- parison at the species level indicates that the Sierra Catorce fauna is most closely affiliated with the Tithonian fauna of Argentina while Mediterranean affinities are somewhat more distant. Boreal elements are unknown. 8. The assemblage of the Virgatosphinctinae beds combines ele- ments of two Argentine zones of the late Lower Tithonian, the Zones of Pseudplissoceras zitteli and of Virgatosphinctes viendo-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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