Cal Orck'o, Paleontological site near Sucre, Bolivia

Cal Orck'o is a limestone wall near Sucre displaying thousands of dinosaur footprints across its steep face. The formation stretches about 1200 meters long and rises 80 meters high, with tracks distributed along more than 460 different pathways.

Factory workers discovered the site by chance in 1985 while working nearby. Between 1994 and 1998, international paleontologists conducted major research that documented its scientific importance and established its worldwide recognition.

The name Cal Orck'o derives from Quechua Kal Urqu, meaning lime hill, after the limestone of the cliff. Since March 2006 the adjacent Cretaceous Park has displayed full-scale replicas of the dinosaurs that left the tracks, and its audiovisual museum was created with support from BID, FANCESA and SOBOCE, with input from paleontologist Christian Meyer.

The site is reached through the adjacent Cretaceous Park, which offers guided tour options for visitors. Come prepared for rough ground and intense sun exposure, so sturdy shoes and sun protection are advisable.

The longest single trackway found here runs 350 metres, made by a theropod whose footprints measure 35 centimetres across. Sauropod prints reach 70 centimetres in length. Because erosion keeps exposing fresh layers, seven track-bearing levels have been counted, and palaeontologists have mapped 12,092 individual prints in 465 trackways.