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A sequence with a transitional Ediacaran–Cambrian biota is described from the Navezuelas stream valley, in the Abenojar anticline (Ibor Group, Central Iberian Zone, Spain). The sequence starts with fine-grained siliciclastics containing Vendotaenia antiqua and moulds of the early skeletal fossil Cloudina cf. hartmannae . These beds are followed by carbonates with Cloudina co-occurring at hand sample level with Vendotaenia antiqua together with protoconodonts similar to Protohertzina unguliformis , suggesting a terminal Ediacaran or lowermost Cambrian age. The detrital beds above this level have simple trace fossils of deposit feeders. Above an upper carbonate bed with tiny vendotaenids there is a trace fossil assemblage of Cambrian aspect, including Treptichnus pedum and ornamented burrows resembling the ventral surface of Psammichnites . The occurrence of protoconodonts is new to the Ediacaran–Cambrian transition in Europe, and this is the third time worldwide that these typically Cambrian fossils are found co-occurring unambiguously with the typically Ediacaran cloudinids, which suggests that the Ediacaran–Cambrian transition was biologically more gradual than previously thought.

Una biota transicional Ediacárica–Cámbrica en el anticlinal de Abenójar (Macizo Ibérico, España)