UNIVERSITY OF CALIFORNIA 



Bulletin of the Department of Geology 



THE GEOLOGY OF CARMELO BAY. 



BY 



Andrew C. Layvson, 



With Chemical A nalyses and Cooperation in the Field Work by 

 Juan i>e la C. Posada. 



CONTENTS. 



PAGE. 



Introduction 3 



Physiography and Relief. .' 4 



General Statement of the Geology 6 



The Santa Lucia Granite 9 



Petrography 9 



Later Granite Dykes 16 



Pegmatite Dykes 17 



Relation to Other Formations 17 



The Carmelo Series 18 



Petrography 18 



Occurrence 19 



Correlation 21 



The Monterey Series 22 



Petrography 22 



Origin of the White Shale 24 



Massive Equivalents of the Volcanic Ash 27 



Fossils 27 



Distribution, Thickness, Structure, elc 28 



Eruptive Rocks 29 



Variation of Character 29 



The Rock-forming Mineral, Iddingsite 31 



The Sunium Point Eruptive Area 36 



The Ravine Area. 39 



The Abalone Point Area 40 



The Lagoon Area 41 



The Mission Area 42 



The San Jose Area 43 



Relation of the Carmeloi'te to Other Formations 43 



