UNIVERSITY OF CALIFORNIA PUBLICATIONS 

 Bulletin of the Department of Geology 



Vol. 3, No. s, pp. 109-172, PI. 17. ANDREW C. LAWSON, Editor 



A CONTRIBUTION TO THE PETROGRAPHY 



OF THE 



JOHN DAY BASIN 



BY 



FRANK C. CALKINS 



BERKELEY 

 THE UNIVERSITY PRESS 



AUGUST, 1902 



PRICE 45 CENTS 



