The park also preserves biologically diverse desert lands above ground, as well as a portion of an exposed fossil reef. One of the most notable ... Lechuguilla Cave at Carlsbad Caverns is the deepest ...

A set of footprints impressed in clay in the Honseca Cave (Velilla del Río Carrión, Palencia), which were made by cave bears that inhabited this area during the Late Pleistocene, are the subject of a ...