Around 65,000 BCE, Neanderthals created cave paintings in three Spanish caves (La Pasiega, Maltravieso, and Ardales), predating modern human arrival in Europe by over 20,000 years. The paintings include red ochre dots, disks, lines, hand stencils, and geometric shapes. Researchers used uranium-thorium dating of carbonate crusts formed over the paintings to establish their age. Since no Homo sapiens populations existed in the region at this time, Neanderthals created these works. The discovery suggests Neanderthals possessed cognitive abilities for abstract thinking and symbolic representation.