From the Paper:

"The Yosemite Valley is the product of many geological forces. One such is glacial scouring, which left the spectacular glaciated granite terrain that can be seen today. Valley glaciers have been described as "tongues of ice in mountain ranges [that] start in ice-worn rock basins called cirques". In these cirques, old snow develops into firn, or nev?, a "mass of ice pellets compacted by the weight of the snow above".

As more snow falls on the firn, it spills over into the valley below, filling it with ice. As this ice moves across the landscape, it collects rock debris, which polishes and scours the valley walls and floor. This scratching action leaves a definitive calling card in the form of grooves that identify ... "

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