mmifkv] PETROGLYPHS IN UTAH AND COLORADO. 27 



" Several fallen blocks of sandstone have rubbed depressions that may 

 have been ground out in the sharpening of tools. There have been 

 many dates of inscriptions, and each new geueratiou has unscrupu- 

 lously run its lines over the pictures already made. Upon the best 

 protected surfaces, as well as the most exposed, there are drawings 

 dimmed beyond restoration and others distinct. The period during 

 which the work accumulated was longer by far than the time which has 

 passed since the last. Some fallen blocks cover etchings on the wall, 

 and are themselves etched. 



" Colors are preserved only where there is almost complete shelter from 

 rain. In two places the holes worn in the rock by swaying branches 

 impinge on etchings, but the trees themselves have disappeared. Some 

 etchings are left high and dry by a diminishing talus (15-20 feet), but I 

 saw none partly buried by an increasing talus (except in thecaseof the 

 fallen block already mentioned). 



"The painted circles are exceedingly accurate, and it seems incredible 

 that they were made without the use of a radius." 



In the collection contributed by Mr. Gilbert there are at least fifteen 

 scries or groups of Bgures, most of which consist of the human form 

 (from the simplest to the most complex style of drawing), animals, 

 either singly or in long tiles, as if driven, bird tracks, human feet and 

 hands, etc. There are also circles, parallel lines, and waving or undu- 

 lating lines, spots, and other unintelligible characters. 



Mr. Gilbert also reports the discovery, in 1883, of a great number of 

 pictographs, chiefly in color, though some are etched, in a canon of the 

 Book Cliff, containing Thompson's spring, about 4 miles north of Thomp- 

 son's station, on the Denver and Colorado Railroad, Utah. 



Collections of drawings of pictographs at Black Rock spring, on 

 Beaver Creek, north of Milford, Utah, have been furnished by Mr. 

 Gilbert. A number of fallen blocks of basalt, at a low escarpment, 

 aie filled with etchings upon the vertical faces. The characters are 

 generally of an "unintelligible" nature, though the human figure is 

 drawn in complex forms. Foot-prints, circles, etc., also abound. 



Mr. I. 0. Russell, of the United States Geological Survey, furnished 

 rude drawings of pictographs at Black Rock spring, Utah (see Figure 

 153). Mi. Gilbert Thompson, of the United States Geological Survey, 

 also discovered pictographs at Fool Creek Canon, Utah (see Figure 154). 

 Both of those figures are ou page 230. 



ROCK CARVINGS IN COLORADO. 



Captain E. L. Berthoud furnished to the Kansas City Review of 

 Science and Industry, VII, 1883, No. 8, pp. 189, 190, the following : 



The place is 20 miles southeast of Rio Del Norte, at the entrance of the canon of 

 the Pieilra Pintada (Painted Rock | Creek. The carvings are found on the right of the 



