36 MR. R. D. DARBTSHIRE ON GREAT ORME's HEAD. 



This stone lay amongst a heap of others near the ruins 

 of the tower, and had don1)tless been bronght up a few 

 feet. The height above the sea of the tower is stated on 

 the Ordnance Map as 1435 feet. 



On Harper Hill, in two large blocks of the overlying 

 stratum, he had detected more-characteristic holes. Both 

 blocks were lying in the sward above the " beach "-surface, 

 and were a few feet below the rock in situ, from which they 

 had evidently been detached. Of the first of these speci- 

 mens he exhibited a photograph. It showed in the under- 

 side of the edge of a projecting ledge or table of stone 

 six well-marked holes from J in. to i in. in diameter, and 

 one an inch deep, and traces of two others. The holes 

 were grouped just as Pholas-holes usually are, and ap- 

 parently were quite independent of the structural fissures 

 of the stone. 



According to measurement with an aneroid barometer, 

 the stone in which those holes occurred was about 1380, 

 and the reef from which it had fallen about 1400 feet in 

 elevation. 



If the holes w^ere really burrows of marine shells, they 

 would indicate the elevation of these hills since the period 

 of glacial action by sea or land*. 



The woodcuts on p. 34 represent a specimen of rock 

 with burrows from Little Orme^s Head, and the specimen 

 from Harper Hill, Buxton. 



^' The specimens referred to were produced to the Society on the 1 5th of 

 October. 



