61 



separate with the light minerals „ The shell material present 

 has fragments of the larger shelled animals in addition to 

 the tests of Foraminiferao 



The phosphorite shows a wide range of rounding (.50 to 

 oSO), as do the smgiller grains of glauconite (,70 to .80). 

 The sphericity of both minerals is from „80 to «90. Shell 

 fragments are angular <, generally with rounding values of 

 .10 and a sphericity range from .70 to .80. Tests of Forami- 

 nifera which occur wholej are well-rounded. However, when the 

 tests are broken, their rounding is in the same range as that 

 of other shell fragments. Detrital minerals in these sands 

 are generally angular. 



Occurrence 



Phosphorite-glauconite-shell sand is found covering the 

 entire shelf projection between the two submarine canyons (Fig, 

 19). They are associated with the area of rock and gravel and 

 also occur as the coarse fraction of all the silty sand and 

 sandy silts on the outer shelf seaward of the gravel areas, 

 A small area near the edge of the shelf south of Redondo 

 Canyon is also covered by this sand type. 



Glauconite Sand 



Description 



The proportion of glauconite in this sand type ranges 

 from about 20% to nearly 100%. Even though the quantity is 

 highly variable, all sediments in vdiich glauconite is a 

 prominent constituent are included as glauconite sand. The 



