Stone is present at pretty well every excavation. It has played a role during the whole of human history starting as the raw material for tools. Later the Romans used it to build with. Just like flint, as a material category, it offers the possibility to win information about our past. Specific tools and the use of certain types of stone can help to date a site. Determining the place of origin of the many types of stone found can tell about acquisition of material resources, exchange relationships and commerce networks. Investigation of the function of tools can give a picture of the activities and industry in and around the site. Examination of millstones has proven to be very fruitful in this respect. Archol, together with the researchers of the University of Leiden, has the necessary specialists to adequately carry out this discipline.