“…In some instances, archaeologists have claimed that it was transported hundreds of kilometers (Gramly, 1999; Simons et al, 1984). Despite assertions that Upper Mercer is “among the easier midwestern materials to identify based on texture, luster, compositional homogeneity, and diagnostic inclusions” (Seeman et al, 2020:119), in actuality it possesses several look‐alikes, such as Zaleski, Boggs, Kanawha, Plum Run, andFlint Ridge (DeRegnaucourt & Georgiady, 1998). DeRegnaucourt and Georgiady (1998:80) even note that the Ferdinand variety of Holland chert from southwestern Indiana “is identical to Upper Mercer and can only be separated by provenience”.…”