208 BLOCKS OF GRANITE AND LIMESTONE GRAVEL. 
inadequate to such effects. ” “ The flanks of the central part of the 
mountain chain of Wicklow and Carlow are strewed with native 
debris ; and these are dispersed over lower ranges for a distance of 
some miles from the central group, and sometimes under circum¬ 
stances that claim particular attention. Cronebane Hill (being com¬ 
posed of slate) bears upon its summit a boulder of granite (called 
motty-stone) 9? feet high, and 42 feet in circumference, and the 
sides of the hill are also strewed with boulders of granite nearly as 
large. How then did these attain their present position? The 
nearest granite rock is that which extends from the eastern bank of 
the Avonmore, towards West Aston Hill; but this is very dissimilar 
in aspect to the granite boulders on Cronebane. The next granite 
in point of distance is that of Ballincarrig, on the banks of the 
Avonbeg; yet in both these instances the granite rock is found 
in a situation several hundred feet lower than the summit of 
Cronebane.” 
“ Whence are the limestone, gravel, and marl derived, which we 
find distributed along the coast of the counties of Wicklow and 
Wexford ? The nearest visible limestone rock in the northern 
quarter is that which occurs at Williamstown and Booterstown, on 
the southern side of the bay of Dublin ; and to the southward, the 
first rock of this description that appears is on the south coast of the 
town of Wexford.” 
After describing other phenomena of the same kind, he proceeds: 
“ It is worthy of observation, that many of these deposits of lime¬ 
stone pebbles, gravel, and marl, are situated at distances from two 
to ten miles from the nearest part of the continuous calcareous tract, 
