WATEK DEPOSITS 673 



158. Gray sand, mud, close to land, California coast. Steamer Trenton; Sta- 



tion No. 3478; latitude 36° 44' 45" north, longitude 120° 57' 0" west; 

 depth, 68 fathoms. April 26, 1893. 



159. Fine gray sand, 15 miles from the shore, west coast of Washington. 



Steamer Trenton; Station No. 3046 ; latitude 46° 48' 30" north, longi- 

 tude 124° 28' 0" west ; depth, 48 fathoms. June 7, 1889. 



160. Mud from 20 miles west from the coast of southern California, on the 

 . border of the continental shelf. Steamer Trenton; Station No. 2891; 



latitude 34° 25' 0" north, longitude 120° 42' 0" west ; depth, 233 fath- 

 oms. January 5, 1889. 



161. Green mud, all inorganic, taken on continental shelf about 10 miles from 



the coast northwest of San Francisco, California. Steamer Trenton; 

 Station No. 3165; latitude 37° 59' 45" north, longitude 123° 8' 35" 

 west ; depth, 50 fathoms. March 23, 1890. 



162. Green mud containing one-third inorganic material, taken 8 miles east 



of the east coast of Lower California. Steamer Albatross; Station 

 No. 3007; latitude 25° 27' 30" north, longitude 110°- 50' 30" west; 

 depth, 362 fathoms. 



163. Green mud from 25 miles southwest of coast of southern California, on 



slope of continental shelf. Steamer Trenton; Station No. 3195 ; lati- 

 tude 35° 14' 0" north, longitude 121° 7' 0" west; depth, 252 fathoms. 

 April 5, 1890. 



164. Brown ooze, consisting of about one-third organic material, taken 50 



miles west of coast of Washington. Steamer Trenton; Station No. 

 2871 ; latitude 46° 55' 0" north, longitude 125° 11' 0" west ; depth, 559 

 fathoms. September 23, 1888. 



Deposits in the Bering Sea. — In Bering Sea we have a wide expan- 

 sion of a shallow continental shelf where sediments are brought by the 

 drainage of the adjacent land and by volcanoes in the sea. The depths 

 at which 11 samples were taken vary only from 13 to 78 fathoms. Seven 

 out of the 11 samples have the maximum composed of fine sand. This 

 is the material around which the grades in the samples from the conti- 

 nental shelf in the west Atlantic are most closely grouped. In two sam- 

 ples the chief ingredient consists of very fine sand, in one it is coarse 

 silt, and in one medium silt. Three of the coarsest samples are excep- 

 tionally well sorted, having each only two grades that contain more than 

 1 per cent of the whole sample. Two samples have a secondary maxi- 

 mum in the fine admixtures. These samples resemble the deposits on 

 the Atlantic continental shelf, but are slightly more uniform in their 

 composition. They contain more magnetic grains and much less organic 

 material. 



