TABLE III (continued) 

 ARCTIC CORE SAMPLES 



NEL 



Sample 

 No. 



Latitude 



North 



Longitude 

 West 



Depth 

 (fathoms) 



Length of 

 Dry Core 



(inches) 



Description 



549 Kotzebue Sound 



551 Entrance to Kotzebue Sound 67° 03' 165° 40' 



562 Port Clarence 



565 Entrance to Norton Sound 



566 Entrance to Norton Sound 



66° 43' 163° 35' 13 12 Grey sandy silt, grading 6 inches from the 



top into fine to medium sand; molluscan shells 

 common at base of core. 



16 20 Poorly sorted sand, with sizable silt and gravel 



fractions grading 8 inches below top into 

 finer, better-sorted sand, then rapidly into 

 silty sand, and finally to sandy silt near the 

 bottom of the core; 4 inches from the top 

 a pebble 20 mm. in diameter occurs. 



65° 18' 166° 28' 25 67 Clayey fine silt, containing occasional rounded 



pebbles including one more than 6 mm. in 

 diameter at 2% inches from top; organisms 

 include mollusks, shallow water forams, and 

 ophiurids (6 inches and 10 inches from top). 



64° 17' 165° 19' 11 12 Sandy silt, with occasionally siltier or sandier 



partings in upper part, becoming progressively 

 sandier 10 inches from top; includes occasional 

 scattered molluscan fragments and foraminif- 

 eral tests. 



64° 25' 166° 30' 14 20 Fine sandy silt, with prominent medium-to- 



coarse sand partings at 5 inches and 11 inches 

 from top, with less prominent partings be- 

 tween 11 inches and HVi inches; laminations 

 resemble faint bedding below 11 inches; below 

 14Y2 inches sediment becomes finer and clay 

 fraction becomes noticeable. 



on an object at the lower portion of the camera support and 

 making exposures at various levels from the surface to the 

 bottom. This experiment clearly showed that the transparency 

 of the water decreased with depth and that a highly turbid 

 layer was present along the bottom. 



Surface-water transparency readings were obtained at 

 each station by recording the depth to which a white disc 

 30 centimeters in diameter (Secchi disc) could be seen (see 

 Transparency Measurements, below). Readings obtained 

 varied from 9 to 50 feet, average depths for coastal water. 

 There appeared to be no correlation between the surface 

 water transparency and bottom water transparency but, 

 wherever the snapper samples showed the bottom to consist 

 of fine sand or mud, a turbid layer was present near the 

 bottom. Thus, although phytoplankton may largely account 

 for the opacity of the surface water, the turbidity of the bottom 

 water must be due to sediment in suspension. 



