The foraminifera: an introduction to the study of the protozoa . Fig. 33.—Axveolina Limestone ; Eocene,Faeafea, Egypt, x 1G. the greater part of the Eocene limestones. It isdivided into three stages, the Libyan or LowerEocene, the Mokattam or Middle Eocene, and theBartonian or Upper Eocene; each of these containscertain characteristic groups of nummulites, whichare of much value in the determination of the varioushorizons. The nummulites attain their greatestdevelopment and abundance in beds of Middle GEOLOGICAL EANGE 273 Eocene age, as they do in many other with these are ot
The foraminifera: an introduction to the study of the protozoa . Fig. 33.—Axveolina Limestone ; Eocene,Faeafea, Egypt, x 1G. the greater part of the Eocene limestones. It isdivided into three stages, the Libyan or LowerEocene, the Mokattam or Middle Eocene, and theBartonian or Upper Eocene; each of these containscertain characteristic groups of nummulites, whichare of much value in the determination of the varioushorizons. The nummulites attain their greatestdevelopment and abundance in beds of Middle GEOLOGICAL EANGE 273 Eocene age, as they do in many other with these are other genera, such asHetcrosfcdnin (tig. 32), Opcyculina, and Alreolina(fig. 38), and sometimes hy their abundance theyform hmestones ahnost wholly consisting of oneparticular form. The Eocene nummulitic beds extend into theSinai Peninsula (fig. 34), and thence to other parts. Fig. o4.—Nummulitic Limestone ; Eocene, , Sinai, x 1G. of Asia. In India the nummulites and other Forami-nifera form massive beds of limestone, often con-stituting the greater part of some of the mountainranges. By a process of folding and crumpling thesebeds of limestone have been elevated, so as to formsome of the highest mountain crests, attaining insome cases an altitude of 16,000 feet. The lower partof the Nummulitic Series in Sind is represented by T 274 THE FOEAMINIPERA the Eanikot beds, containing NiiniiiiiiHte.^ sjiira, , and N. Le/jmeriei; and tliis is followedby the Kirthar Gronp, with N. Gai-aiineih^U^ also aEuropean species, and N. siih-hcrigata, apparentlyconfined to India. The nnmmulites are here asso-ciated with large species of Alveoliua and the Oligocene strata in Germany the beds areoften richly foraminiferal, and the Septarian Clay
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