[Joseph] Le Conte
5.not come squeezingly, gropingly down to the main valley by the narrow, angular, tortuous [deleted: channels] canons of Tenaya & Illilowette, but all of this Sum- mit ice was united above the Valley, even toward the later glacial period, and flowed grand- ly and directly over all the upper domes like a steady wind, while its lower, bottom currents went mazing and swedging down among the crooked and dome blocked channels below. Glaciers have made every mountain form of this whole basin, and even the Summit mountains are only fragments, reminants of their pre-glacial selves. Every Summit wherein are laid the Sources - the wombs 6.of glaciers is steeper upon the north than the south side, because of the difference in [underlined: depth] and [underlined: duration] be- tween exposed and sheltered glaciers, and this difference in steepness between the N and S. Side of Summits is greater on the lower Summits, as those of the Obelisk group. This tells us something of the Glacial climate. Such Mts as Clouds Rest, Starr King, Cathedral Peak, &c. do not come under the general law, because their contours were determined by the ice that flowed above them, but even among these basin mts we frequently find marked difference of steepness upon their N. and South Sides,
1872 Dec 17
Original letter dimensions: 20.5 x 25.5 cm.
Reel 02, Image 1003
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