Poza Rica (Miocene of Mexico)

Where: Veracruz, Mexico (20.5° N, 97.5° W: paleocoordinates 21.0° N, 94.8° W)

• coordinate based on nearby landmark

When: Tuxpan Formation, Middle Miocene (16.0 - 11.6 Ma)

• There are two underlying formations according to some sources, with one being Meson Formation, and the other being the Escolin Formation; both of which apparently rest unconformably underneath the Tuxpan in different places. Overlying Formation: Unclear at this time. Thickness: 155 m at the type section. (Vega et al, 1999; Alzaga-Ruiz et al, 2009).

Environment/lithology: marginal marine; yellow, silty, calcareous sandstone and gray, sandy siltstone

• There seems to be agreement that this formation was deposited in euryhaline waters in depths of 10-30 meters, representing a marginal marine environment that may have included supra, meso and infralittoral. (Vega et al., 1999; Sour-Tovar et al., 2018; Gomez-Espinosa et al., 2018).
• Cream-colored sandstones seem to be the dominant lithology of the formation, but it also includes siltstone, polygenetic conglomerates with pebbles composed of limestone, as well as fragments of reef and volcanics. It contains a relatively high diversity and abundance of gastropods, bivalves, annelid tubes, crustacean remains, and echinoids. (Vega et al., 1999; Sour-Tovar et al., 2018; Gomez-Espinosa et al., 2018; Alzaga-Ruiz et al., 2009).

Size class: macrofossils

Primary reference: J. Luque, T. Nyborg, J. Alvarado-Ortega and F. J. Vega. 2020. Crustacea (Anomura, Brachyura) from the Miocene of Veracruz and Chiapas, Mexico: New records and new species. Journal of South American Earth Sciences 100 [J. Wolfe/A. Lynch]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 228597: authorized by Joanna Wolfe, entered by Arthur Lynch on 16.12.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Malacostraca
 Decapoda - Portunidae
Portunus atecuicitlis
Portunus atecuicitlis Vega 1999 swimming crab
 Decapoda - Raninidae
Ranina sp.
Ranina sp. Lamarck 1801 crab