14 Clvg [Cleavage] lines on S [South] wall of Merced Lake Valley
[sketch: 1400 feet high; Trib [tributary]; Lake Wall 1500 feet high]
15 500 [ ] [By] [Thor]
Highest Yosemite of Merced The Slot or gorge on the N [North] side of the Merced Lake Valley on the W [west] side of central leaning front rock owes its existence not to the action of a shearing of ice uniting with the main can [canyon] gl [glacier] but wholly to the fact that a seam of granite 7 feet thick near the top of the wall with an exceptionally great quantity of feldspar in its composition extends back in the wall This seam has disintegrated very easily allowing the side of the main valley gl [glaciers] to enter deeply & form the main part of the gorge The deeper & narrower part has been eroded later by rain & snow & especially by a small buckling brook wh [which] at the present day (Aug 4th 1873) is so soft & is disintegrating so fast & deeply that a shovel can in many places be easily thrust into the solid unmoved rock The rock on either sides of this seam is like common granite, hard & stands up like a steep wall. Occasionally a hard mass occurs in the middle of the seam wh [which] is disintegrated out & rolls off down like a boulder. All kinds of clvg [cleavage] ^ ║║ = ∩ is seen on the
Original journal dimensions: 15 x 18 cm.
Holt-Atherton Special Collections, University of the Pacific Library
John Muir, journals, drawings, writings, travel, journaling, naturalist