Cuban archaeologists are studying the strange drawings found in caves in eastern Cuba. The petroglyphs, discovered in the Sierra del Rosario reserve located in Pinar del Rio province, have now motivated large-scale research in the area to establish the origin of the asymmetric carvings in the stalagmites. According to Cuba's renowned historian Luis Formigo, the carvings were made by pre-tribal aboriginal people who also carved stone to make fire, track time and follow the course of events between the years 5,000 and 3,000 BCE.