ATLANTIC OOZE 



75 



The microscope tells us that the chalk consists ot 

 tiny shells, analogous to those of the Atlantic ooze. 

 Experienced microscopists can find no special dififer- 



Fig. 15. A thin Slice of Chalk. Very greatly magnified. 



ence between them. So great is the resemblance, that 

 we are led to think that the chalk of the future is 

 now being deposited on certain ocean floors. 



