110 THE OCEAN FLOOR 



foram tests, (2) measurements of radioactive elements 

 present in different sediment layers, and (3) the study, 

 within certain regions like the Mediterranean and In- 

 donesian Seas, of volcanic ash layers. 



Apart from the work on the "Albatross" cores here 

 referred to, hardly any systematic investigations of 



/oo 



cm(^eep 250 SOO 750 /OOO /^50 



Fig. 37. Lime and manganese distribution in sediment core 

 from the Romanche Deep 



long sediment cores have been published. It is indeed 

 unfortunate that these rare abstracts from the records 

 of the deep should — perhaps because of preconceived 

 ideas on the process of deep-sea sedimentation — be 

 allowed to lie fallow and deteriorate for want of suitable 

 storage. It may sincerely be hoped that the increasing 

 amount of international cooperation in deep-sea re- 

 search will lead to a more respectful treatment of the 



