Chucal Nesodon, mesothereChucal is located in the Altiplano (high plateau) of northern Chile at an elevation nearly 4,500 m. As far as we are aware, it is the highest vertebrate fossil locality in the western hemisphere. It is also among the highest vertebrate fossil sites in the world. The area was at a much lower elevation when its fossils were deposited, and at that meme the region supported a diverse and abundant mammal fauna of at least 18 different species. Interestingly, some of the mammals present at Chucal belong to groups that were not present in southern South America (Patagonia) at that time. Thus, Chucal is important for documenting what is known as “provinciality,” or the presence of different mammals in different places. For example, mesotheriid notoungulates are common and diverse at Chucal but are unknown in faunas of similar age from southern Chile and Argentina. Similarly, interatheriids (another family of small notoungulates) and ground sloths are common in Patagonia fossil sites but have not yet been recorded at Chucal. By combining information from Chucal with data from other Chilean and Bolivian faunas, we will better understand when and how such provinciality originated and what effects it has had on modern faunas. The ungulates of Chucal were described a few years ago and we more recently tackled the cingulates (armadillos and glyptodonts). Rodents are next on the agenda.

For more information see: