Novel contributions and errata to the work 'Morphology and ontogeny of the fossil lobster Meyeria magna M'COY, 1849 (Astacidae: Mecochiridae) from the Lower Cretaceous (Lower Aptian) of Mexico, United Kingdom and Spain'

摘要

The analysis of microfacies, microbiota and calcareous nannoplankton from La Palmera quarry in Santa Isabel Atenayuca and San Juan Raya Formation in the central part of Mexico yields new insights into data presented in the paper "Morphology and ontogeny of the fossil lobster Meyeria magna M'COY, 1849 (Astacidae, Mecochiridae) from the Lower Cretaceous (Lower Aptian) of Mexico, United Kingdom and Spain". The sedimentary record giving rise to the Santa Isabel Atenayuca section was deposited in a low-energy platform top. The presence of the foraminifera Choffatella decipiens (SCHLUMBERGER, 1905), Pseudocyclammina sp., Cuneolina sp. in association with the calcareous algae Montiella? elitzae (BAKALOVA 1971), Marinella lugeoni (PFENDER 1939), Salpingoporella muehlbergii (LORENZ 1902), Neomeris sp. and Terquemella? sp. indicates a late Barremian - early Aptian age. By contrast, the stratigraphic interval of San Juan Raya Formation studied at the Barranca Agua de Burro and Barranca el Gavilan sections corresponds to a more distal marine platform setting of late Valanginian? - early Hauterivian age. This age allocation for the studied interval of the San Juan Raya Formation indicates that this stratigraphic unit commonly ascribed to the Aptian in the literature, is in fact much older. This new age assignment is based on the presence of the nannofossils Speetonia colligata (BLACK, 1971), Cruciellipsis cuvillieri (THIERSTEIN, 1971), Rhagodiscus dekaenelii (BERGEN 1994), Zeugrhabdotus fluxus (CASELLATO 2010), Tubodiscus verenae (THIERSTEIN 1973), Helenea quadrata (BOWN & RUTLEDGE in BOWN et al. 1998) and a relative high abundance of Cyclagelosphaera margerelii (NOEL 1965), which can be ascribed to the NC4A-NC3B zones. In addition, a listing of the identified errata to the aforementioned work is provided.