53 of the Sierra. The northern extremity of the range is perhaps somewhere between the railroad summit & Lassens Butte. The [continuity] of the chain geologically considered is certainly not maintained beyond Lassens Butte. Between Shasta & the Coast is an insuperable series of mtns, [botanically] as well as geologically. All around the base of Shasta are evidences of lava flows arranged thus, lava [burst] forward in concentric rings like the edges of glacial [annual] layers, with deep [sketch of lava layers along a tube]
54 channels on both sides Traces of the [ancient] gls of Shasta are somewhat obscured by the various lava flows yet some of the principal ones as regards size may be readily made out. Large tributaries flowing S west united with others flowing N west from large mass of gray mtns lying to the West of Shasta, & gave rise to the main upper Sacramento gl wh flowed southward. Other tributaries from the SE flank, united to form the McCloud gl While from a wide low mer de glace between Shasta & Lassen Butte issued the gl of the Pit River.
Original journal dimensions: 9 x 14.5 cm.
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John Muir, journals, drawings, writings, travel, journaling, naturalist