248 C. L. HERRICK 



Limestone and shale ---------- 90 ft. 



Sandstone shale with lime bands ----..- jq 



Gray limestone ----------- 100 



White sandstone ---------. 40 



Gray (gypsiferous) shales --------- 20 



Yellowish sandstone - - - - -- - - - 100 



Yellowish shale ----------- ^ 



Reddish gypsiferous shale - - - - - - - - 175 



Anhydrite and limestone resting on fissile shale - - - - - 100 



Gray shales --------- Unexposed. 



Red flags and shales (several hundred feet). 

 Carboniferous limestone (Coal Measures). At least 400 ft. 



The Carboniferous is separated from the detailed section by a 

 valley perhaps a mile wide filled with low hills of the red beds, the 

 dip being in all cases to the east. It is therefore very 

 difficult to determine the thickness of the red beds, 

 nor is it certain that there is no dislocation. There 

 *"'^»' is the same difficulty in determining the extent of 

 the fault at the top of the detailed section, but it is 

 presumed that the throw is small, though there is 

 YiG, y.—Lepi- ^^ ^^^^ ^^ Vertical strata intervening. 

 dodendron socor- It is not difficult to conclude that the detailed 



roense. (Enlarged section here given corresponds in a general way with 

 ^^ j.^ X that east of Socorro above the sandy shales, etc., 



marked as "indefinite." In fact, it would appear 

 that the thick anhydrite bed is a very convenient and rather con- 

 stant bench mark, however variable it may be in thickness. 



References may here be made to the section given in the writer's 

 article on the "White Sands. "^ This section is from a locality com- 

 paratively rich in fossils of a decidedly Permian habitus. 



PLANTS OF THE INCARNACION CLAYS. 



The following descriptions are given as a matter of convenience, 

 in spite of the fact that it has not been possible to compare our speci- 

 mens with eastern types. The forms seem to be new, and may serve 

 to assist in calling attention to similar occurrences in the South- 

 west. 



I Bulletin of the University oj New Mexico, Vol. II, Fasc. 3, p. 10. 



