PocEEDiNGS Am. Philos. Soc. Vol. LII. No. 21 1 



Plate XIX 



FOSSILIFEROUS LIMESTONES ONE KILOMETER WEST OF ItAPASAROCA, RiO GrANDE 



DO NoRTE. 



Fig. a. Looking east. The beds dip eastward about 5° into the plain. 

 Fig. b. Looking west. The beds are thrown into waves here. 



Photographs by E. C. Starks, May, 1911. 



