.22 FORAMINIFERA 



centage of specimens with a well preserved surface for study 

 may be obtained. 



With very hard compact material such as limestones, the only 

 resort is a study of sectioned specimens. This method is of 

 use with the orbitoids, the Fusulinidae, and some others, but not 

 as valuable for many of the Rotaliidae or other groups where 

 the exterior is necessary for specific determinations. Weathered 

 specimens will often show good exteriors and after their 

 determination, it is possible to recognize the same species in 

 sections from the same horizon. 



