The most recent taxonomic study from these localities was done by Perejon and Moreno-Eiris (2003), who reported the presence of Archaeocyathus laqueus (Vologdin, 1932), Pycnoidocyathus erbiensis (Zhuravleva, 1955), Polythalamia sp.
The archaeocyathan biodiversity in the Esla nappe is higher because the floatstone lithofacies surrounding the mounds records the presence of Polythalamia sp., and Okulitchicyathus valdorensis Perejon and Moreno-Eiris, 2003 (Debrenne and Zamarreno, 1970; Perejon and Moreno-Eiris, 2003).