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fragmentary pedestal (Fig. 1) of limestone from eight to nine 
inches in average height above the surrounding ground ; but 
it is possible it may have found this pedestal ready made, so 
that it can admit of no reliable calculations concerning the 
time required for the circumjacent denudation of the limestone 
rock. Farther north a small boulder may be seen resting 
partly on limestone, with a surface around the boulder which 
has been lowered only about two inches by rain since the 
boulder came into its present position. On the neighbouring 
limestone outcrops other boulders may be seen, around which 
the action of rain has lowered the general surface to the 
extent of only a few inches. From a comparison of facts, and 
after rejecting boulders which may have found ready-made 
pedestals, I have been led to the conclusion, that if we include 
hollows (chiefly on the leeward, but likewise on the windward 
side of boulders, and to a small extent all round the boulders) 
the average vertical extent of circumjacent denudation since 
the boulders were left by melting ice has not been more than 
about six inches, and that this extent does not necessarily 
indicate a period of more than a few thousand years (see 
sequel). Before leaving this plateau, it may be well to state 
that many of the boulders show signs of having fallen from a 
great height (probably from floating ice), for the boulders have: 
not only been fractured, but the limestone rocks on which they 
fell have been rent and shattered to a very striking extent. 
It ought not to be forgotten that many of the boulders would 
appear to have fallen on bare limestone rock, as there are no 
traces of drift or boulder-clay around or under them, so that 
