198 THE SUNKEN LAND OF BUS. — POOLE. 



mostly well-rounded, but the smaller fragments were often 

 angular or subangular) ; orthoclase decomposed and rounded ; 

 microcline (rare) ; weathered oligoclase ; also perfectly fresh 

 sanidine, oligoclase, andesine and labradorite (in angular splinters 

 and cleavage flakes). These last contained augite microliths 

 and glass cavities. Brown volcanic glass, occasionally fluidal or 

 finely vesicular, frequently perlitic, but not spherulitic, colour- 

 less, transparent pumice in fine shreds and splinters with 

 concave outlines. Less common were magnetite in grains and 

 small octahedra ; pyroxene of two varieties, pale green and 

 clear brown ; chlorite ; glauconite in rounded cryptocrystalline 

 aggregates ; olivine, perfectly fresh, in angular fragments ; one 

 small grain of pink garnet. Among the doubtful minerals 

 were hypersthene, zircon, and epidote. 



Sounding 58. — A tough, pale brown deposit, with many 

 Fcraminifera. Insoluble residue 5414 per cent. Minerals : 

 small rounded quartzes up to 03 millimetre in diameter, 

 weathered orthoclase, sanidine, oligoclase, microcline, brown 

 glass, shreds of pumice, hornblende, green and brown augite, 

 magnetite. 



Sounding 98. — Pale brown Globigerina ooze. Insoluble 

 residue, 31 '12 per cent. Minerals : quartz, mostly rounded up 

 to 0"3 millimetre in diameter ; orthoclase, microcline, sanidine, 

 oligoclase, andesine, labradorite, fragments of colourless pumice 

 and of brown glass, green hornblende, augite (brown and green), 

 magnetite, olivine, epidote, glauconite ; also a doubtful isotropic 

 mineral. 



Sounding 121^.. — Pale, creamy-white, coherent Globigerina 

 ooze. Insoluble residue, 20"62 per cent. Recognizable mineral 

 particles in this were very few, and formed not more than 2 or 

 3 per cent, of the sample. They were mostly brown and colour- 

 less volcanic glass, angular pieces of felspar, green augite. 

 Quartz was either absent or very scarce. 



