THE DEPOSITS OF THE SEA-BOTTOM. 



27 



Station 12. Between Iceland and Greenland; Transition clay; 2-10 per ct Chiefly black pumice; 

 further gray tufa containing numerous black grains of volcanic glass; finally a few pieces 

 of black, compact basalt. 



Station 13. Between Iceland and Greenland, nearer to the latter; Transition clay; 23-57 per ct Chiefly 

 volcanic material. The larger grains rather angular, consisting of a red-brown, rather pe- 

 culiar variety of basalt with glassy inclosings and brown grains of feldspar; in section it 

 was seen to be built as typic basalt, with numerous grains of augite, feldspar, and magnetite 

 lying in a glassy matter. The smaller grains were more or less rounded, and contained 

 of volcanic ingredients black or dark gray basalt, a few pieces of black and gray pumice 

 and gray tufa. Of not volcanic material were found a few pieces of quartzite, dark, mica- 

 ceous sandstone, grayish and yellowish, loose quartz sandstone, a few grains of feldspar 

 and quartz. 



Station 17. Southwest of Iceland; Globigerina clay; 0-33 perct. Almost angular pieces, chiefly of black 

 basalt and pumice with all degrees of transition; one single red-brown piece of pumice. Of 

 not volcanic material was found a piece of granite or gneiss, much larger than any of the 

 other pieces . further a piece of sandstone, and a grain of quartz. 



Station 18. Southwest of Iceland ; Globigerina clay ; 0-25 per ct. Almost half of the material volcanic, 

 black pumice and gray tufa. Otherwise grains of quartz; one piece of quartzite. 



Station 19. Southwest of Iceland; Globigerina clay; 5-84 per ct. About two thirds volcanic material, 

 of which must be noted: several pieces of the same light gray tufa; several pieces of the 

 same characteristic black, porous basalt; a few pieces of black, compact basalt, basaltic pu- 

 mice, light pumice, and olivine. Of the not volcanic ingredients I note: numerous grains 

 of quartz; a few grains of feldspar and hornblende, a few pieces of sandstone, one single 

 piece of granite or gneiss. 



Station 21. South of Greenland; Transition clay; 4-24 per ct. Chiefly not volcanic, but numerous 

 grains of quartz; further pieces of gneiss, clay-slate, a large piece of sandstone, biotite, mu- 

 scovite, and feldspar. About one fourth volcanic, consisting of compact and porous basalt, 

 tufa, a few pieces of glassy basalt and obsidian. 



Station 24. West of Greenland; Gray deep-sea clay; 0-02 per ct.; two grains of quartz. 



Station 25. West of Greenland; Gray deep-sea clay; 0-36 per ct. Very small, partly rounded grains 

 of quartz formed the chief mass; besides some grains of a very fine-grained or compact 

 grayish rock; single grains of feldspar and biotite. 



Station 27. West of Greenland; Gray deep-sea clay; the percentage undetermined, not very large. Far 

 the greater part grains of quartz, partly rounded; besides biotite, feldspar, and some pieces 

 of a similar grayish fine-grained rock as in the preceding specimen. 

 Station 28. West of Greenland; Gray deep-sea clay; 0-17 per ct. Far the greater part grains of quartz; 



besides feldspar, magnetite, and a piece of the same rock as in the preceding specimens. 

 Station 29. West of Greenland; Sand; 177 per ct. Far the greater part grains of quartz; besides the 

 same gray rock as in the preceding specimens; the larger pieces found here, seemed to in- 



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