(1987): The Cretaceous-Tertiary Boundary in a sector of the South Limb of the Miranda-Trevino Synclinal: the first appearance of Chelonia and Archosauria in the Basque Country.
The next most abundant groups are the Pteridophyta (15%) and Ostheichtya (14%), while the others (Charophyte, Bryophyta, Mollusca, Amphibia, Squamata and Archosauria) make up the remaining percentage of the taxa identified so far (Fregenal-Martinez and Buscalioni, 2009).
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