Gordon and Graton — Formations in New Mexico. 395 



inasmuch as it is the same which was discovered years ago in 

 the Ouray limstone in southwestern Colorado by Mr. Endlich. 

 It is characterized by the large and striking- species Camaro- 

 tcechia endlichi Meek, and heretofore has not been recognized 

 outside of the San Juan Mountains. 



At Silver City the Devonian system is represented by fissile 

 shales, — about 200 feet of black shales at the bottom followed 

 by 260 feet of red shales, in neither of which have fossils been 

 found. 



It may be added that the Devonian system is not repre- 

 sented in the Franklin Mountains of Texas, but is present in 

 eastern Arizona. 



Carboniferous. — In the northern half of New Mexico, where 

 the pre-Cambrian complex is overlain by sediments, the lowest 

 and oldest stratified rocks are Carboniferous. The work of 

 the past summer indicates that in these instances, with possibly 

 one or two exceptions, the Pennsylvanian division of the Car- 

 boniferous lies at the base of the section. It is interesting to 

 note, however, that wherever the lower Paleozoic rocks are 

 present, the Mississippian or Lower Carboniferous strata sepa- 

 rate the Devonian from the Pennsylvanian rocks. This is 

 the well known Mississippian fauna which was first recognized 

 in !New Mexico in the Lake Valley mining district. 



