Groundwater has moved through the limestone for millions of years. The movement of groundwater through the limestone has caused formation of chert nodules. The chert is composed of silicon dioxide and ...

We know the oldest human cultures only from their most durable parts: mostly stone tools, sometimes bone. Show an experienced Pleistocene archaeologist a chert blade, and they can probably tell ...

Areas in brown (Louisiana, Mississippi, etc.) are hard chert, quartz, flint rock and hard river rock. Areas in dark blue (Wisconsin, Indiana, etc.) are pit gravel, limestone and dolomite.

"Numerous arrowheads were discovered in all the occupation layers of sites JKSH F19 and P52, as well as F15. They are made on small fine-grained chert blades, some of which were probably imported ...

More than 140 houses in Gainesville were built using the limestone rocks, called chert, that were abundant in the quarries of North Florida between 1920 and 1940.