obsidian mi: . 
Obsidian, a volcanic glass of very diversified 
characteristics of color and texture, was mieh utilised 
by the American aborigines in their arts. It occurs in 
vast deposits in the western half of Northern America, 
in Mexico and Central America, The workings have so far 
received but meagre attention. In 1873 the writer made 
iivM %.yVt*'U/U 
superficial studies of the remarkable deposits of the 
A. 
Yellowstone Park and especially obsidian canyon where 
cliffs of black, rudely cclun: ed X • is s rise to the 
height of 100 feet or acre. The refuse of aboriginal 
operations observed at a number of points indicate the 
manufacture of the ‘usual varieties of chipped imp! e. cents , 
(fig, %) , Obsidian was worked somewhat extensively 
in the mountains of northern New Mexico , in Nevada, and 
Arizona ^ and the Pacific States are exceedingly rich in 
