640 W. T. LEE STRATIGRAPHY OF COAL FIELDS OF NEW MEXICO 



son (83, page 173 et seq.) to the Santa Fe marls and which, according 

 to his definition, included rocks of both Tertiary and Quaternary age. 

 They are the rocks that form the aggraded parts of the high altitude 

 conoplain (90) that has been described from this region. 



The Sloan coal mine is located in the Hagan field about 3 miles north 

 of the Hagan mine, and the formations of the Hagan section are all ex- 

 posed there. The coal beds have been described by M. E. Campbell (103, 

 page 428), who quotes a section of the coal -bearing rocks measured by 

 Charles E. Keyes. The Mancos shale below and the Galisteo (?) forma- 

 tion overlying the Mesaverde are present and are characterized by the 

 same features as those described from Hagan and from Pina Vititos. 



The Mesaverde is fossiliferous at several horizons. The massive sand- 

 stone underl3dng the principal coal beds contains Halymenites major 

 Lesq. and some of the species of shells that were found in the Mesaverde 

 at Hagan. Fossil leaves, Ficus speciosissima Ward, Ficus sp. type F. 

 lanceolata, Ficus sp. type F. planecastata, and several undescribed forms 

 were found in the white sandstone overlying the main bed of coal. These 

 same species were found at about the same horizon in a gulch half a mile 

 south of Sloan mine. 



Pina Vititos is the name of a coal mine located at the north end of the 

 Hagan field about 3 miles north of the Sloan mine and about 14 miles 

 west of Cerrillos. All of the formations from Dakota to Tertiary (?) 

 are well exposed in the gulch in which the mine is located. They all dip 

 about 30 degrees east and disappear under a cover of surface debris. 

 Those below the Mesaverde do not differ in kind or character from the 

 Mancos at Hagan and were not examined in detail. A section of the 

 Mesaverde and younger rocks was measured with tapeline in the gulch 

 and the measurements corrected for dip are given in the following section : 



Section of Rods measured at Pina Vititos, New Mexico 



Feet 



Recent 



[ Conglomerate and breccia, containing a few pebbles of 

 quartz, chert, etc., but consisting principally of 

 blocks of igneous rock up to 5 feet or more in di- 

 ameter, cemented to a resistant mass (many hun- 

 dreds of feet) 



Sandstone composed principally of igneous material . . . 165 



Unconformity 



