155 



Rock fragment sand is the coarse fraction of nearshore 

 and offshore sands and silty sands, and represents a relic 

 sediment that was deposited during lower stands of sea level. 



Glaticonite sand is the coarse component on the basin slope 

 circling he outer shelf, on the seaward portion of the shelf 

 off the Malibu coast, and near the tip of the shelf south of 

 Redondo Canyon. 



Phosphorite-glauconite-shell sand is the coarse fraction 

 of the sands and gravels, and of the finer sediments of the 

 outer shelf projection between the two submarine canyons. 



Shell sand occurs as the coarse component of some of the 

 fine-grained sediments on the basin slopes. 



Red sand is in scattered areas in the nearshore region. 

 This material is a relic beach or dune deposit formed at 

 lower stands of the sea, and has not yet been covered by Recent 

 deposition. 



The distribution of median diameters indicates that the 

 grain size of the sediments decreases in an offshore direction. 

 The decrease is modified by coarse relic material, authigenic 

 minerals, and organic fragments occurring offshore. Also, 

 sltimping or sliding of sediment on the slopes tends to modify 

 this distribution pattern. 



The distribution of coarse sediments in patches through- 

 out the bay tends to indicate that there are localized areas 

 of non-deposition, or areas of intermittent deposition. 



The distribution of median diameters indicates that there 

 is continuous marine deposition taking place nearshore between 

 Santa Monica and Redondo Beach, and on the shelf off the Malibu 



