PIEDMONTITE AND KYANITE FROM THE FRANCISCAN OF SANTA CATALINA ISLAND
BY EDGAR H. BAILEY*
A quartz schist with piedmontite and crossite on Santa Catalina Island is associated with glaucophane schist, lawsonite rock, quartz-albite schist, pillow lava, red chert, and serpentine. It is believed that the piedmontite schist belongs in the Franciscan group. The schist is believed to have been formed by the metamorphism of a manganiferous chert.
A green amphibole-kyanite-clinozoisite-corundum gneiss occurs associated with many types of hornblende, clinozoisite, plagioclase, and garnet gneisses and amphibolites. This series, occurring structurally above the glaucophanic rocks, may or may not be part of the Franciscan group.
REGIONAL CORRELATION OF STRUCTURAL ELEMENTS-PROBLEMS: WESTERN UNITED STATES
BY PAUL BILLINGSLEY AND AUGUSTUS LOCKE
Regional correlation involves identification and dating of structures within the scattered well-mapped areas and tracing these between areas. This divides into several problems: (1) Evolution of rocks. This is studied in the gradation . . .