MICROSCOPIC OBJECTS. 96 



Fig. 191. Section of Eocene Nummulitic Limestone from 

 Gerona, x 6. 



This section,, together with that represented in fig. 192, 

 belongs to the calcareous division of rocks. It is a sedimen- 

 tary formation. 



The Nummulites seen in this section are Foraminifera; 

 and the limestone itself is an important member of the 

 Eocene formation, being well developed throughout an exten- 

 sive area in Southern Europe, and even still further eastwards 

 to India. 



Fig. 192. Foraminifera in the lowermost Bed of Carboni- 

 ferous Limestone, from Bristol, x 20. 



This limestone, which often attains a great thickness, is 

 tolerably compact and argillaceous, and retains in a great 

 measure unaltered the structure due to sedimentary deposi- 

 tion, so that the organic remains are well preserved. Amongst 

 the Foraminifera is the genus Fusulina. Compare the forms 

 with the comparatively recent Foraminifera as seen in figs. 

 103, 104, &c. 



It is a sedimentary formation. 



