1 Andalusian Institute of Earth Sciences (CSIC-UGR), Avda. de Las Palmeras 4, 18100 Armilla, Granada, Spain.
2 Andalusian Institute of Earth Sciences (CSIC-UGR), Avda. de Las Palmeras 4, 18100 Armilla, Granada, Spain; Department of Stratigraphy and Paleontology, Faculty of Science, University of Granada, Avenida Fuentenueva s/n, 18071 Granada, Spain. Electronic address: acheca@ugr.es.