94 PICTURE-WRITING OF THE AMERICAN INDIANS. 
has changed to gray, and no amount of wear or weather seems to turn it back. The 
indentation is so shallow as to be imperceptible to sight or touch, and yet the marks 
are as plain as they could be made, and can be seen as far as the rock ean be dis- 
tinguished from its fellows. 
It is hardly likely that the work was done without some motive besides the simple 
leve of doing it, and it was well and carefully done, too, showing much patience and 
doubtless consumed a good deal of time, as the tools were poor. 
A large ledge is marked near Meadow lake in Nevada county, and in the state of 
Nevada the petroglyphs cover a route extending from the southeast to the north- 
Fig. 55,—Petroglyphs at Reveillé, Nevada. 
west corner of the state, crossing the line into California in Modoe county, and leay- 
ing a string of samples clear across the Madeline plains. 
Eight miles below Belmont, in Nye county, Nevada, an immense rock which at 
some time has fallen into the canyon from the porphyry ledge above it has a patch 
of marks nearly 20 feet square. It is so high that a man on horseback can not reach 
the top. 
A number at Reveillé, in the same county, are also marked. On the road to Tybo 
every large rock is marked, one of the figures being a semicircle with a short verti- 
cal spoke within the curve. At Reno a heavy black rock a couple of feet across is 
