Southern California Geology | Mafic Enclaves

Featuring a swarm of fine-grained, mafic enlaves, some ellipsoidal, appearing to swim through the surrounding biotite-hornblende monzogranite pluton emplaced some 103 million years ago within the Western Transition Zone of the Peninsular Ranges here in Southern California.

Location: South Shore of Lake Perris, CA.  33.83804° N, 117.17293° W