Basin and Slope Environment (Bathyal) 



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Figure 146. Surface of shelf east of Santa Catalina Island (lat. 33° 19.0'. long. 118° 17.7', 90 meters). Sediment is fora- 

 miniferal shell sand. Conical piles of sediment have been dumped at the mouths of holes by burrowing worms. Small 

 white objects are sea urchins, Lytechimts anamesus, and long curved lines are sea whips, probably Acanthoptilum sp. 

 Bottom edge is about 2 meters wide. 



Figure 147. Upper slope of Santa Monica Basin off Santa Catalina Island (lat. 33°31.4', long. 118°42.6', 540 meters). 

 Sediment is glauconitic foraminiferal shell sand. Note trails made by movements of sea urchin, Allocentrotus fragilis. 

 Bottom edge is about 2 meters wide. 



