DEEP-SEA DEPOSITS 89 



and F. Brotzen in Stockholm. The radiolarians were 

 investigated in Goteborg and later in Scripps Institu- 

 tion by Riedel of Adelaide, Australia; and the work on 

 diatoms was done by R. Kolbe of Stockholm. Fortu- 

 nately, the Oceanographic Institute of Goteborg could 

 serve as a coordinating center for these investigations. 



From this very brief summary it will be obvious that 

 the work carried out on the material of the "Albatross" 

 cruise has been truly international — specialists from 

 many countries having generously shouldered the bur- 

 den of investigations. To all these workers my sincerest 

 thanks are due. Without their participation in the ex- 

 tensive studies on our precious cores the work would 

 have had to be severely curtailed. The Swedish Re- 

 search Council generously supported the work and 

 added to the government grant for the heavy printing 

 expenses. 



The most significant chemical component in the 

 sediments is calcium carbonate, mainly in the form of 

 calcareous tests or shells derived from plankton in the 

 surface layers. The most important contributors to 

 biogenetic sediments are the Foraminifera, protozoans 

 varying in diameter from .01 to 1 millimeter. Their 

 shells may amount to 90[c of the total weight of the 

 sediment. Other contributors are the Coccolitho- 

 phorides, with shells built up from plates of lime of a 

 size varying between P/o and 12 microns. 



The lime content of the sediment is of importance 

 also for classification. A content of CaCOg exceeding 



