U. S. GEOLOGICAL SURVEY 



PROFESSIONAL PAPER NO. 20 PL. 



. - 



STRUCTURE IN COVILLE SERIES (TERTIARY). 

 A, Looking S. 50° W.; B, looking S. 65° W. 



C. COAL BED AND ROCKS OF CORWIN SERIES AT CORWIN MINES 

 Looking S. 45° E. 



