"The vernal pools of the Santa Rosa Plateau are the only known examples of Southern Basalt Flow Vernal pools. The basalt on the Santa Rosa Plateau is the key to the large number of vernal pools there, since intact basalt is nearly impervious to penetration by water. Only 14 vernal pools survive in Riverside County; 13 of them are protected on the Santa Rosa Plateau. Of the 13 pools at the Santa Rosa Plateau, eight are on Mesa de Burro, ***four are on Mesa de Colorado*** and one is on Mesa de la Punta."
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tchester.org/srp/vp/index.html
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