Thin, sharp-edged pieces of stone that were shaped into tools or weapons, or the waste left over from flintknapping . Flint occurs naturally in many locations and often formed the material for human tools, until humans learned to work metals. Flint was the most common 'stone' of the Stone Age. The process of chipping and shaping flint to give it sharp edges useful for scraping and cutting. A dating method that measures the amount of fluorine, nitrogen, and uranium in bones.
Older bones have more fluorine and uranium and less nitrogen.
But because decomposition happens at different speeds in different places, it's not possible to compare bones from different sites. A floor plan shows how something looks from above. The remains or imprints of plants and animals. A type of wall painting. Paint was applied to freshly spread plaster before it dried.