SHUMARD—GEOLOGY OF N. MEXICO. 285 
dip eaaeey changes, — toward the south, and then to 
the southwest, gradually diminishing as we reach the western 
extremity of the Pass, where it does not exceed 5° or 10°. 
As the strata 1 strata exposed at the Pass are some ae hag 
tus costatus, P. Tellinom Allornicin: re- 
si lg pr ee new spe- 
r species), 
atica, and Chemnitzia (several species). 
Most of the fossils at this locality, were obtained from the 
wire stt the base of the cliffs 
_ Sierra From the western extremity of the Sierra 
er gt a, at 
