Period 3500 – 1500 BC is considered as the first period in which mathematics was observed on the basis of archeology. This surely does not mean since we do not have any proofs prior to this period there was no math. Even Homo Sapiens might have used simple math like proportionate division of land & food, constructing walls/caves/homes with specific dimensions for shelter and protection from predators, etc.
In the period 3500 – 1500 there were no writing materials and hence most of imprints were found on wall, on stones, on clay items like pottery,utensils, etc. Such type of archeology were found in