512 



CENOZOIC ERA— AGE OF MAMMALS. 



Among JRJiizopods, Nummulites (a foraminifer, Fig. 861) abounded 

 to an extraordinary degree. Eocene strata, many thousand feet thick, 

 are formed of these shells. The JSTummulitic limestone of the Alps 

 extends eastward to the Carpathians, westward to the Pyrenees, and 

 southward into Africa. It was largely quarried to build the Pyramids 



Fig. 807 



Fig. 868. 



Fig. 869. 



Figs. 862-869.— Eocene Tertiary Shells : 862. Ostrea sellaeformis (after Meek). 863. Ostrea 

 Georgiana (after Meek). 864. Pecten nuperum (after Wailes). 865. Anomalocardia Missis- 

 sippiensis (after Conrad). 866. Umbrella plamilata (after Wailes). 867. Turritella alveata 

 (after Wailes). 868. Volutalithes dumosa (after Wailes). 869. Volutalithes symmetrica (after 

 Wailes). 



of Egypt. It occurs also extensively in Asia Minor and in the Hima- 

 layas. 



