 These were used to make early tools and weapons; for example, high quality flint found in northern France, southern England and Poland was used to create flint tools.Flint mines have been found in chalk areas where seams of the stone were followed underground by shafts and galleries.The mines at Grimes Graves and Krzemionki are especially famous, and like most other flint mines, are Neolithic in origin (c. 4000–3000 BC).