Field relations show that the Santa Catalina Island pluton intruded both the Catalina Schist and the San Onofre Breccia. Early to middle Miocene macrofossils from the San Onofre Breccia of East End Quarry support the 19 Ma radiometric age of the pluto . . .

Introduction: The chief purpose of this field trip is to visit two 'granitoid' components of the Franciscan Complex near Cazadero, CA. One of these components is a multiply metamorphosed quartz diorite exotic block in the King (formerly Kings) Ridge R . . .