In 2013 Robert Yarmer donated 292 lithic artifacts that had been cached at a site in Barton County. A cache is a group of items stored or hidden for future use, for trade, or some other significance we today do not know. It is possible the cache dates to the Late Ceramic period. This cache contained bifaces, modified flakes, scrapers, knives, cores, and debitage. Predominately they were made of Permian chert, though a few were made of Smoky Hill silicified chalk, which outcrops in western Kansas. The lithic pieces shown here are a sampling of the large cache.