154 



CHARLES R. KEYES 



They rest unconformably upon the older rocks and have the tri- 

 assic Red Beds reposing in a very marked unconformable relations 

 upon them.' The formation has a very wide geographic distri- 

 bution, and is, for the most part, unfossiliferous. 



The complete sequence of formations composing the New Mexi- 

 can Carboniferous section may be tabulated as follows:^ 



^American Journal oj Science (4), Vol. XX (1905), pp. 423-29. 

 ^The wavy lines represent unconformities. 



