678 



i)R J. H. HARVEY PIRIE OK DEEP-SEA DEPOSITS 



most part of minute mineral fragments or rock flour, produced by glacial action, there 

 is nevertheless a considerable amount of amorphous clayey material. I propose, 

 therefore, following Dr Philippi's lead, to separate this group of deposits from the 

 ordinary Blue muds and to designate them glacial clays, muds, or sands, according to 

 their physical characteristics. 



The following table gives in grouped form the depth, colour, and composition of all 

 the marine glacial deposits obtained, with the exception of a few comparatively shallow- 

 water deposits, mostly from the neighbourhood of the S. Orkneys : — 













Mineral Particles. 





No. 



Depth. 



Colour. 



CaCOg. 

 Percentage. 



Siliceous 

 Organisms. 

 Percentage. 







Fine Washings. 

 Percentage. 



Per- 



Mean Diam. 













centage. 



in mm. 





7 



2250 



Green-grey 





Trace 









8 



2739 



>) 



Trace 



Trace (Rad.) 



5 



6'\Q 



95 



9 



2558 









Trace (Sp.) 



10 



0-07 



90 



10 



2587 



Grey 



Trace 



Trace (Rad.) 



10 



0-08 



90 



11 



2511 



11 







Trace 



f 20 

 1 10 



0-16 

 010 



80 (upper portion) 

 90 (lower portion) 



12 



2452 



Blue-grey 







1 (Di.) 



15 



007 



84 



13 



2488 



Green-grey 



5 







15 



0-10 



80 



14 



2500 



) J 







Trace (Di.) 



20 



• • • 



80 



15 



2425 



J) 











20 



0-07 



80 



16 



2500 



Grey 



2 







12 



008 



86 



17 



2485 



Dark grey 



Trace 



Trace (Sp.) 



10 



0-08 



90 



'18 



2547 



Blue-grey 







Trace (Di.) 



15 



0-08 



85 



19 



2550 



Grey 







>) 



10 



07 



90 



20 



1956 



)) 







1 (Sp.) 



10 



0-06 



89 



21 



1775 



Blue-grey 



2 



Trace (Rad., Di.) 



70 



0-25 



28 



26rt 



2110 



Brown-grey 



1 



10 (Di.) 



60 



013 



29 



30 



2625 



Brown 



Trace 



Trace (Rad.) 



5 



012 



95 



31 



2630 



Grey 







)) 



3 



0-09 



97 



32 



2685 



)) 











2 



0-05 



98 



33 



1131 



Green-brown 







2 (Sp., Di., Rad.) 



20 



0-17 



78 



35 



2102 



Brown-grey 







Trace (Sp.) 



25 



0-06 



75 



36 



2338 



... 





• • • 





■ • . 





37 



2370 



Green-grey 



Trace 



Trace (Sp., Rad.) 



15 



0-06 



85 



38 



1410 



>j 



4 



1 (Sp., Rad.) 



20 



0-07 



75 



39 



1221 



)) 



2 



2 (Sp., Rad., Di.) 



15 



0-08 



81 



40 



2620 



Brown-grey 







Trace (Sp.) 



20 



07 



80 



41 



2487 



1) 



(Upper 5| 

 \Lower IJ 



)J 



20 



0-08 



75 



42 



2660 



Light brown 







)) 



20 



0'07 



80 



43 



2715 



}) 







M 



5 



007 



95 



44 



2764 



Grey-brown 







>J 



3 

 16-7 



0-08 



97 



30 1 

 sainjilesj 



2343 



... 



... 



... 



009 



82 (average) 



It will be seen that the average depth from which these thirty samples come is 2343 

 fathoms, the greatest being 2764 fathoms, and the least 1131 fathoms. 



Appearance. — The ground colour as brought up from the bottom is a slaty-grey, 



