courses gave an approximate north-south and east-west topographic picture of the 

 seamount. A peak with a minimum depth of 22 fathoms was recorded at ^.6° 44' N. 

 -,o 



latitude, 130" 47' 

 tant readings. 



W. longitude. This position was determned by loran and sex- 



As the maximum depth of the recording depth-finder was four hundred fath- 

 oms, little information can be given as to the characteristics of the seamount be- 

 low this depth. The portion of the underwater mountain above four hundred fathoms 

 is approxinately 35 square miles. The sides appear quite steep up to a depth of 

 110 fathoms where a certain amount of leveling or terracing appears. The distorted 

 relationship between vertical and horizontal distance on the fathogram will give 

 the impression that there is little or no level bottom; however, sone relatively 

 level ledges were found at depths of 70, 80, and 110 fathoms. These ledges, al- 

 though not extensive, were large enough to make a number of long-line sets. 



Numerous efforts were made to pick up samples of bottom material with 

 a small, snapper-type, bottom sampler; but in most cases the sampler failed to 

 pick up any material, although in several instances a coarse, white calcareous sand 

 was obtained. It is probable that the upper portion of the seamount is mostly rock 

 with sand and mud collecting on the terraced regions. 



FIGURE 38 

 SEVERAL 



- FATHOGRAM OF SEAMOUNT. DEPTH SCALE IS IN FATHOMS. RECORDING SHOWS RESULTS OF 

 COURSES RUN OVER THE PEAK. 



49 



