PROCEEDINGS 



OF THE 



CALIFORNIA ACADEMY OF SCIENCES 

 Fourth Series 



Vol. XI, No. 19, pp. 527-601, pis. 17-41 July 10, 1922 



XIX 



TERTIARY AND QUATERNARY HISTORY OF THE 



PETALUMA, POINT REYES AND SANTA 



ROSA QUADRANGLES 



BY 



ROY E. DICKERSON 



Honorary Curator, Department of Invertebrate Paleontology 



CONTENTS 



Introduction and Acknowledgments 528 



Outline of Results 529 



Review of the Literature 531 



Geology 535 



Limestone of Mesozoic or Paleozoic Age (?) 536 



Granitic Rocks of probable Mesozoic Age 536 



Franciscan Group, Jurassic (?) 537 



Monterey Group, Middle Miocene 538 



Petaluma Formation, Upper Miocene 540 



Fauna 542 



Merced Group, Pliocene 543 



Fauna ; • • • • 549 



Descriptions of California Academy of Sciences' Localities 



from the Merced 549 



Sonoma Group 551 



Sonoma Petrified Forest 555 



Correlation 556 



Millerton and Tomales Formations ■ • • ■ 559 



Descriptions of the California Academy of Sciences' Pleisto- 

 cene Localities of the Millerton Formation 562 



Undifferentiated Pleistocene 570 



Structure and Stratigraphy 571 



Movements within the Dominant Blocks 573 



Topography and Physiography 576 



The Rift Valley of Tomales Bay 578 



Berkeley Hills Block 578 



Kenwood Valley 579 



Sonoma Mountain 580 



Hayward Rift 581 



Tertiary Geologic History 590 



Appendix : Economic Notes 



Manganese and Chrome Deposits, Limestones, Clays and Coal, 



Oil • 593 



Water Resources 



Artesian 596 



Ground 596 



