MALLERY.] IN MARYLAND. 85 
evident that much time and great labor were expended upon them, as 
this variety of rock, locally termed ‘“ Nigger-head,” is extremely hard. 
Fig. 45 represents a_bird’s-eye 
view of the top of the rock, bearing 
the greater amount of workmanship. 
The petroglyphs cover a surface 
measuring about 5 feet by 4 feet 6 
inches. The extreme ends of the 
figures extend beyond the irregular 
horizontal surface and project over 
the rounded edge of the rock, so 
that the line, at the left-hand lower 
part of the illustration, dips at an 
angle of about 45°. The two short 
lines at the extreme right are upon 
the side of the upper edge of-the 
rock, where the surface inclines at 
an angle of 30°. 
Some of the figures are indefinite, 
which is readily accounted for by 
the fact that the rock is in the river, 
a considerable distance from shore, 
and annually subjected to freshets 
and to erosion by floating logs and drift material. The characters at 
Fic. 46.—Slab from Bald Friar rock, Maryland. 
Fig. 47.—Top of Bald Friar rock, Maryland. 
the right end of the upper row resemble those near Washington, Lan- 
caster county, Pennsylvania. (See Fig. 73.) 
