Plate 28 (Catalog No. 11X10-261) illustrates a smaller blade 
chipped from a curved flake of obsidian. There is no infor- 
mation on the source of this item. Material shown in both 
plates is black obsidian, but those shown in Plate 27 are 
shiny and that in Plate 28 is of a different, duller or more 
weathered variety. 
