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- Updating the geological and stratigraphic occurrences of La Rioja dinosaur sites. Palaeobiodiversity of the Lower Cretaceous Enciso Group at Peña Cárcena (Igea, Spain)Publication . Isasmendi, Erik; Navarro-Lorbés, Pablo; Lopez Horgue, Miguel Angel; Sáez-Benito, P.; Viera, L.; Torices, Angelica; Pereda Suberbiola, XabierABSTRACT: The discovery of new vertebrate fossil sites with skeletal remains in the Enciso Group of Igea (La Rioja) is showing the relevance of the area to study the palaeobiodiversity of Early Cretaceous vertebrate faunas from the Iberian Peninsula. At Peña Cárcena hill two sedimentary environments have been inferred: a mixed siliciclastic-carbonate lacustrine environment that is dominant at the outcrops, overlaid by a splay delta in an avulsion-belt. The vertebrate remains are especially abundant in the mixed siliciclastic-carbonate lacustrine deposits with two partially articulated skeletons (a theropod and a large-sized dinosaur), teeth and a fragment of a left maxilla of baryonychines, a pterosaur tooth that differs from those of Prejanopterus, a Goniopholis tooth, chelonian shell fragments that might belong to Camerochelys, a fairly complete lepisosteiform, teeth and dorsal fin spines of hybodontiforms. At the delta deposits, vertebrate fossils are rather scarce, with a single lepisosteiform skeleton and indeterminate bone fragments.