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Newark Valley shows two well defined old lake shores on all sides. The lower is 150 feet above the bottom of valley, the upper 250 feet above. The notch in north end of valley is slightly if at all higher than the upper lake shore in well worked old channel cuts through the river and down Huntington Valley. Undoubtedly Newark Valley where an immense lake at its highest drained out to the north by the South Fork Humboldt River.
The ridge separating the two almost continuous valleys is low, open Transition not high enough to keep Sonoran species from ranging across. Junipers come down on the ridge in places and Transition Species might easily cross on this bridge from the Diamond Range to the Rubies.