[Many thanks to Peter Jordens for bringing this item to our attention.] Sarah Derouin (Geological Society of America) writes about a recent study of cave art in Puerto Rico carried out by geophysicist Angel Acosta-Colon (UPR-Arecibo Campus) and archaeologist Reniel RodrÃguez (UPR-Utuado Campus). In the karstic caves of Puerto Rico, cave art paints the rock…