UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 9, No. 6, pp. 77-88, plate 7 Issued January 20, 1916 



RELATION OF THE INVERTEBRATE TO THE 

 VERTEBRATE FAUNAL ZONES OF THE 

 JACALITOS AND ETCHEGOIN FOR- 

 MATIONS IN THE NORTH 

 COALINGA REGION, 

 CALIFORNIA 



BY 



JORGEN O. NOMLAND 



CONTENTS 



PAGE 



Introduction 77 



Historical 78 



Jacalitos and Etchegoin Northeast of Coalinga 79 



Invertebrate Fauna] Zones 81 



Vertebrate Faunal Zones 83 



Summary 84 



Section showing Time Relationship of Invertebrate and Vertebrate Faunal 



Zones in the Jacalitos and Etchegoin Formations near Coalinga 85 



Description of New Species 85 



Calliostoma etehegoinensis, n. sp 85 



Purpura turris, n. sp 86 



Natica convexa, n. sp 86 



Introduction 



In a recent publication by Professor J. C. Merriam 1 attention was 

 called to the finding of vertebrate fossils in the Jacalitos and Etchegoin 

 formations near Coalinga, Fresno County, California. It was also 

 pointed out that these vertebrate remains have been found in zones 

 having a quite definite relationship to the invertebrate faunal zones 



i Merriam, J. C, Tertiary Vertebrate Faunas of the North Coalinga Region, 

 Trans. Amer. Philos. Soc, vol. 22, part 3, 1915. 



