Comment on: “A Paleogene ichnological record from the Wilcox Formation: Ophiomorpha and Venericardia (Venicor) zapatai in the Burgos Basin, northern Mexico” by M.I. Hernández-Ocaña, E. Chacon-Baca, S.A. Quiroz-Barroso, S. Eguiluz-de Antuñano, F. Torres-de la Cruz, and G. Chávez-Cabello
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