200 ft. 



300 ft. 



400 ft. 



500 ft. 



TERRACED OUTER PLATFORM. 

 HARD, ANGULAR SURFACE. SPUR 

 AND GROOVE CONFIGURATION 

 WELL-DEFINED TO OBSCURE. 

 MARGIN ABRUPT AND SOME- 

 TIMES OVERHANGING. 



NUMEROUS CAVES, TERRACES, 

 NOTCHES, AND IRREGULARITIES. 

 SLOPE APPEARS VERTICAL AND 

 LOCALLY CONCAVE. FEATURES 

 STRONGLY SUGGESTIVE OF SUB- 

 AERIAL OR INTERTIDAL EROSION. 

 THIN VENEER OF COARSE TO 

 FINE SAND ON LEDGES. 



LUXURIANT CORAL GROV/TH 

 TO 200 FEET GRADUALLY 

 DIMINISHING AND FINALLY DIS- 

 APPEARING BELOW 350 FEET. 



MAJOR RELIEF FEATURES 

 DIMINISH BELOW 450 FEET. 

 WALL APPEARS SMOOTHER 

 WHILE RETAINING ROUGH 

 TEXTURE. APPEARANCE OF 

 SMALL-SCALE GROOVES TREND- 

 ING DOWN-SLOPE. UNCON- 

 SOLIDATED SEDIMENT ACCUMU- 

 LATION INCREASING. SLOPE 

 GRADIENT APPEARS TO LESSEN 

 BETWEEN 500 AND 600 FEET. 

 LARGE BLOCKS OF REEFROCK 

 SCATTERED AT RANDOM. 



PLATE 24. TONGUE OF THE OCEAN, WESTERN MARGINAL (RIM) ESCARPMENT FROM 

 OUTER PLATFORM EDGE TO 600 FEET DEPTH. 



54 



