Abstract Caches of argillite bifaces, which are often referred to as petalas blades, have been discovered across much of New Jersey, eastern Pennsylvania, and other Middle Atlantic states. Some of these discoveries are recent; however, many significant finds were made in the late nineteenth and early twentieth centuries. Some of the these caches have been previously analyzed; however, many have not. This study employs Geographic Information Systems and detailed analysis of these blades to better...

Abstract Throughout the Paleo, Archaic, and Woodland trade and exchange of exotic or highly knappable materials was present throughout North America. One item of trade significance to the Middle Atlantic is chert, specifically jasper. Jasper is iron-rich, cryptocrystalline rock that is deposited in between limestone and/or sandstone, or it originated within gravel deposits from glacial or tributary movement. Access to jasper as a knappable material was from the quarries that are located in...