112 PICTURE-WRITING OF THE AMERICAN INDIANS. 
of which are difficult to trace. From a rough sketch reproduced as 
Fig. 76, made by Mr. Brown, these appear to be Algonquian in type. 
eo 06©f 7” 
i 
OF 
a = 
Fic. 76.—Petroglyphs near Layton, Pennsylvania. 
Mr. Brown also submitted for examination two pieces of chocolate- 
colored, smooth, fine grained slate, of hard texture, bearing upon the 
several sides outlines of incised figures. The specimens were found in 
Indian graves in Fayette county, Pennsylvania. The outline of the 
Fic. 77.—Glyphs in Fayette county, Pennsylvania. 
