192 



Figure 165. Section of beach sand from Newport Beach impregnated with a clear plastic and extending from the 

 surface to a depth of about 4 mm. Two fine-grained dark laminae are present at depths of about 1 and 2 mm. From 

 Emery and Stevenson (1950, Fig. 1). 



departure of 2082 grains measured by Curray 

 in thin sections at La Jolla's Scripps Beach 

 was 15°, similar to results he obtained on 

 beaches of the Atlantic Ocean and the Gulf 

 of Mexico. Laboratory experiments by Scott 



(1954) showed that the sand grains on the 

 foreshore tended to become tightly packed 

 during their movement by waves; in con- 

 trast, grains washed onto the berm above 

 were very loosely packed — presumably with 



Figure 1 66. Laminated beach sand cemented in nature by travertine formed by seepage of ground water from sea cliff 

 about 500 meters south of Casa Pool in La Jolla. Subsequent exposure and differential erosion caused some laminae 

 to be recessed more than others. Similar cementation has been observed at Point Fermin. 



