The invasion of the Alta Stock had a dramatic affect on the enclosing sediments. The heat of the stock recrystallized much of the limestone, forming tan to white marble. Marble forms the sandy soil near the end of the traverse into Catherines Area and much of the cliff-forming outcrops beneath the Supreme Chair and at the Hellgate Cliffs.

Brilliant white lenses of marble are exposed in Hellgate Cliffs in this photo taken from the Snowbird tram. The grey outcrops in the cliff face are limestone that was not recrystallized to marble. The heat source for the marble was the 35 million year old Alta Stock, located a short distance to the east.

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