Abstract
On the flanks of Eagle Rock Valley, two miles west of Pasadena, Cal., are several dome-shaped structures developed in conglomerate. They resemble in a general way the granite domes of the Sierra Nevada, but are much smaller and also less isolated as regards the surrounding topography. The conglomerate is of lower Miocene age, is quite regularly bedded, somewhat tilted, and consists of sand pebbles and boulders of the granite, diorite, gabbro, gneiss, and other crystalline rocks which form the San Gabriel Mountains to the north. Some of the boulders are as much as 6 feet in diameter, although the average are not over 3 or 4 inches; some of the layers are little more than coarse pebbly sandstone.
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