Fig. 1

a Location of the Punta La Llastra W section (Santa Mera, Villaviciosa) on the geological map of the east-central region of Asturias (north-west Spain; modified from García-Ramos & Gutiérrez Claverol, 1995); b general stratigraphical log (not to scale) of the Lower and Middle Jurassic of Asturias (modified from García-Ramos et al., 2011); c detailed stratigraphical log of the studied section with ophiuroids: the letters indicate several recognised levels (see Fig. 2B)