[Joseph] Le Conte
In the grass between A & B where the slates are awanting they are always to be found upon the summits of speirs & peaks of sufficient height as on the Hoffman range & the highest peaks of the Merced group. In many places where slate is absent on comparatively high mtns the quality of the granite proves that the line of separation from the slate is nearly reached. - Damdation hs been greatest just where we would expect it to be viz between A & B for there glaciers would according to present data attain their greatest depth. Lower, they would gradually shallow by increasing warmth of temperature. Higher they would be gradually less accumulated until they curved unswedged up against sharp naked summits or against nearly motionless tablelands of ice Glaciers are removing Slates from the granite now I think that this piece of mtn restoration will please you It was you wh first directed my attention in this direction & I am delighted to find your suggest- ions bearing such glorious fruit. I will not at present guess concerning the depth of slate Strata wh have been removed nor of other strata still higher. but of this I am sure. The present Summits of the range are fragments wh have been cut down this (Section 2) from a height wh I will not regard at this time. Also, the present axis of the main range does not
1872 Apr 20
Original letter dimensions unknown.
Reel 02, Image 0775
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