The Ancient Yosemite Glaciers: How the Valley Was Formed All California has been glaciated, the low plains and valleys as well as the mountains.

Traces of an ice-sheet, thousands of feet in thickness, beneath whose heavy folds the present landscapes have been molded, may be found everywhere, though glaciers now exist only among the peaks of the High Sierra.

No other mountain chain on this or any other of the continents that I have seen is so rich as the Sierra in bold, striking, well-preserved glacial monuments.

Indeed, every feature is more or less tellingly glacial.

Not a peak, ridge, dome, canyon, yosemite, lake-basin, stream or forest will you see that does not in some way explain the past existence and modes of action of flowing, grinding, sculpturing, soil-making, scenery-making ice.