TABLES 



Underwater topographic relationships and photo analysis 

 of sea floor microrelief. . . page 16-17 



Distribution and general relationships of underwater 

 topographic relief. . . 19 



Numerical scale of sea floor microroughness and descrip- 

 tive notes. . . 53-55 



ILLUSTRATIONS 



1 Sea floor topographic relief. . . page 18 



2 Map showing NEL sea floor camera stations and underwater 



topographic features. . . 15 



3 Photo and laboratory analysis card. . . 21 



4 Camera, Type I, low oblique photographic coverage of sea 



floor. . . 22 



5 Camera, Type II, high oblique photographic coverage of 



the sea floor. . . 23 



6 Camera, Type III, vertical stereophotographic coverage of 



the sea floor. . . 24 



7 Microrelief on sea floor. . . 29 



8 Microrelief on sea floor - east equatorial Pacific. . . 3 



9 Manganese-encrusted bedrock, boulders, or nodules on a 



topographic high, Rift Mountains, Indian Ocean. . . 35 



10 Exposed bedrock enclosed by coarse, rippled calcareous 



sand on abyssal plain south of Java Trench, Indian 

 Ocean. . . 35 



11 Manganese-encrusted boulders in coarse sand and gravel, 



located on ridge above elongated basin, Gulf of 

 California. . .35 



12 Exposed boulders imbedded in thin silty-sediment cover 



on upper flanks of Coronado Bank. . . 35 



13 Cross rippling in sorted calcareous sand on a topographic 



high, Rift Mountains, Indian Ocean. . .37 



