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



Ortiz Mountains to the coal in the vicinity of Madrid, but in the inter- 

 vening space the coal is covered with debris from the mountains. North 

 of Omera the coal beds were displaced by the intrusion of the igneous 

 rock of Cerro Pelon, which rests on the basal sandstone of the Mesaverde 

 at its southern end and on Mancos shale farther north. This shale and 

 basal sandstone were observed underlying the Galisteo sandstone north 

 of Cerro Pelon in the vicinity of the town of Galisteo, but no indication 

 was found that any coal occurs there. It seems probable that the erosion 

 which preceded the formation of the Galisteo sandstone removed all 

 rocks that may have existed above the basal sandstone of the Mesaverde 

 in the vicinity of Galisteo. Little was seen of the Mesaverde or of the 

 older rocks between Galisteo and Cerrillos. They are covered for the 

 most part by younger rocks, but near Cerrillos the Mancos and Mesaverde 

 reappear in vertical position upturned by the intrusion of the igneous 

 rocks of the mountains north of this town. 



West of Cerrillos the rocks dip steeply to the south and Galisteo Creek 

 flows in a gorge cut along the strike partly in the Mancos shale and 

 partly in the basal sandstone of the Mesaverde formation. About one 

 and one-half miles west of Cerrillos the rocks are well exposed south of 

 the stream, and a section was examined carefully for the purpose of locat- 

 ing the coal beds which have been developed at Eogers, a coal-mining 

 camp west of Madrid, now abandoned. At the horizon where the main 

 coal beds should occur coal was found, but the beds are thin, possibly 

 due to crushing at the time the rocks were upturned. Otherwise the sec- 

 tion at this locality does not differ materially from the Eogers section 

 which follows, except that the base of the Galisteo sandstone is more 

 coarsely conglomeratic than it is at Eogers. It consists here of hard 

 quartzose sandstone containing pebbles principally of quartz and chert 

 up to an inch or more in diameter. 



Fossil plants were found at this locality at a horizon about 325 feet 

 above the top of the basal sandstone of the Mesaverde. They occur in 

 shale in a railroad cut on the branch line from Waldo to Madrid. They 

 are as follows: 



Fossil Leaves collected in a Railroad Cut one and one-half Miles West of 



Cerrillos 



(United States Geological Survey locality number 6021) 



Brachyphyllum sp. Fictis laneeolata Heer 



Celastrus n, sp, Ficus n- sp. (3-nerved) 



Fieus speeiosissima Ward 



