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loam which is very soft and in wet weather forms an almost impassable mire and in dry weather shrinks and cracks in all directions. 
The miocene sandstones of which the hills are chiefly made up attain a thickness of several hundred feet without any duplication being counted in.

The Tessajara Creek flows westward from the flanks of Mt. Diablo and with its tributaries about ten or twelve miles northward from Livermore. This creek was followed for eight or nine miles up to its headwaters in the hills. It issues by the junction of two brooks from a narrow cañon on the SW flank of Mt. Diablo. Some of the springs which feed it are impregnated with sulphur and