BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 23, pp. 571-686 NOVEMBER 26, 1912 



STEATIGRAPHY OF THE COAL FIELDS OF T^ORTHERN 

 CENTRAL NEW MEXICO ' 



BY WILLIS T. LEE 



{Presented before the Society December 27, 1911) 



CONTENTS 



Page 



Location of areas examined 571 



I'urpose of investigation 572 



Preliminary statement of results 574 



Previous investigations 575 



Geologic formations 583 



The type sec-tion 583 



Dakota sandstone 593 



Mancos shale 594 



Mesaverde formation 598 



Lewis shale 607 



"Laramie" formation 607 



Tertiary and later formations 608 



Correlation with the Raton section 010 



Post-Cretaceous unconformity 612 



Descriptive details 615 



Monero and Dulce 615 



Cabezon 619 



Rio Puerco field 622 



Tijeras coal field 629 



Hagan field 633 



Cerrillos field 642 



Bibliography and notes 659 



Location of Areas examined 



The areas in which the observations forming the basis of tliis paper 

 were made lie in central and northern New Mexico, around the southern 

 end of the main mass of the Rockv Mountains. Tlie rocfion includes the 



1 Manuscript roceived by the Secretary of the Society May 28. 1912. 

 This paper was presented imder the title "Correlation of roclts in the isolated coal 

 fields around the southern end of tiie Hocky Mountains in Now Mexico."' 

 Published by permission of the l)irector of the U. S. Geological Survey. 

 XLI— Bull. Geol. See. Am., Vol. 23, 1911 (571 ) 



