The origins of horseback riding

Abstract
The horse is ridden by means of the bit, and the bit leaves its trace on the horse's teeth. The beginnings of horse-riding are here identified by defining and detecting microscopic bit wear on equid teeth, using comparative samples from 4 countries and 25,000 years of prehistory. Scanning electron microscope analysis demonstrates that bit wear is clearly distinguishable from other tooth damage. It first occurs in the Ukraine, USSR, at about 4000 BC. Soon thereafter, mobility became a cultural advantage that transformed Eurasian societies. Riding now appears to be the first major innovation in land transport, pre-dating the wheel.