THE DEPOSITS OF THE SEA-BOTTOM. 



2 9 



Station 63. South of Iceland; Transition clay; o-or per ct. Of the 11 very small grains 7 consisted 

 of a porous, black lava, 3 of a tufa-like rock; 1 grain of quartz. 



Station 64. South of Iceland; Brown deep-sea clay; o - o8 per ct. The rather numerous, very small 

 grains almost exclusively quartz; a few grains of feldspar: of volcanic material a few pieces 

 of tufa, one single grain of basalt. 



Station 65. South of Iceland; Transition clay; 278 per ct. Consisted of a comparatively very large 

 piece of black, compact basalt, disintegrated on the surface with a reddish crust. The rest 

 very small, and not numerous grains. More than half of it not volcanic, viz. some grains 

 of quartz, a single grain of feldspar, a piece of gneiss (?) consisting of quartz, feldspar, and 

 a dark mineral. Among the small grains was found of volcanic material basalt, black, po- 

 rous glass, gray tufa. 



Station 66. South of Iceland; Transition clay; o - o8 per ct. The very small grains consisted chiefly of 

 quartz; a few grains of feldspar; of volcanic material a few pieces of black, compact basalt, 

 porous basalt, grayish tufa. 



Station 67. Southwest of Iceland; Transition clay; 0-02 per ct. 28 small grains, 17 of which were 

 quartz, 8 black, compact basalt, 3 gray tufa. 



Station 68. Southwest of Iceland; Transition clay; cooper ct. A grain of quartz, and a piece of black, 

 porous basalt. 



Statiou 69. Southwest of Iceland; Transition clay; o-io per ct. Chiefly volcanic material, especially 

 pieces of light gray pumice forming the largest pieces, some black, porous basalt, a few 

 pieces of gray, volcanic tufa; of not volcanic material was found some quartz; a few grains 

 of feldspar. 



Station 73. Southwest of Iceland; Transition clay; 1-33 per ct. Almost exclusively volcanic material, 

 especially large masses of a grayish pumice forming all the largest pieces (up to 8 mm ), and 

 the greater part of the smaller ones; under the microscope it was seen to be basaltic; further 

 a great number of pieces of black pumice, connected with the preceding mineral by gradual 

 transition, and this again passed gradually into more or less porous basalt; quite compact 

 basalt, however, was scarcely found ; besides a mass of volcanic tufa ; a few crystals of olivine 

 and grains of augite. Of not volcanic material were found a few grains of quartz and 

 orthoclase. 



Station 74. Southwest of Iceland; Transition clay; o-22 per ct. Chiefly volcanic material, viz. gray or 

 brownish gray pumice, black, shining pumice, and gray tufa; a smaller quantity of black, 

 compact basalt; of not volcanic material only a few grains of quartz. 



Station 75. Southwest of Iceland; Globigerina clay; 0-08 per ct. A little more than half of the 

 material volcanic, viz. black pumice, gray, volcanic tufa, gray and brown pumice; a smaller 

 quantity of orthoclase and light mica. 



Station 76. Southwest of Iceland; Globigerina clay; 0-07 per ct. About half of the material volcanic; 

 black, porous basalt and gray, volcanic tufa; otherwise quartz and a smaller quantity of 

 feldspar and muscovite. 



Station 77. Southwest of Iceland; Globigerina clay; 0-07 per ct. About half of the material volcanic, 



