MIDDLE MIOCENE VOLCANIC ROCKS OF THE ELEPHANT HILL-PUDDINGSTONE RESERVOIR AREA = ROCHES VOLCANIQUES DU MIOCENE MOYEN DE LA REGION DU RESERVOIR ELEPHANT HILL-PUDDINGSTONEBREM GERALD F; WOYSKI MARGARET S ED.1981; 1981 TOUR AND FIELD GUIDE TO PETROLEUM RESEARCH AND PRODUCTION FACILITIES; THE GEOLOGY OF THE EASTERN PUENTE HILLS, NORTHEASTERN LOS ANGELES BASIN, AND THE COASTAL GEOMORPHOLOGY OF SOUTHWESTERN ORANGE COUNTY, CALIFORNIA; USA; 1NATL. ASSOC. GEOL. TEACH., FAR WEST. SEC:CALIF. STATE UNIV., DEP. EARTH SCI./1FULLERTON,; DA. 1981-04; PP. 74-83; BIBL. 14 REF.; 1 TAB. ; ILL.Book Chapter