672 J. A. UDDEN COMPOSITION OF CLASTIC SEDIMENTS 



151. Gray ooze. Ooliths and various organic remains not counted in the 



analyses. On slope of continental shelf. Steamer Albatross; Station 

 No. 2731; latitude 36° 45' 0" north, longitude 74° 28' 0" west; depth, 

 781 fathoms. October 25, 1886. 



152. Foraminiferal sand and mud, one-tenth organic and not sorted, taken on 



lower part of slope of continental shelf, southeast of New York. 

 Steamer Albatross; Station No. 2094 ; latitude 39° 44' 30" north, longi- 

 tude 71° 4' 0" west; depth, 1,022 fathoms. September 21, 1883. 



153. Gray mud. Much organic material, such as shell fragments, crinoids, 



and rhizopods, not included in the analyses. Steamer Albatross; Sta- 

 tion No. 2584; latitude 39° 5' 30" north, longitude 72° 23' 20" west; 

 depth, 541 fathoms. September 19, 1885. 



154. Dark green mud, much organic (Globigerina) not counted, on the slope 



of the continental shelf. Steamer Albatross; Station No. 2729; lati- 

 tude 36° 36' 0" north, longitude 74° 32' 0" west; depth, 679 fathoms. 

 October 25, 1886. 



Sediments on the submerged west slope of the west coast of America. — 

 Ten samples came from the relatively steep submerged slope of the 

 American continent in the Pacific. These show some extreme differ- 

 ences in the perfection of sorting. Some mud taken not far from the 

 month of Salinas Eiver off the coast of California has no less than nine 

 grades which contain more than 1 per cent. In another sample .98 per 

 cent are contained in two grades. This was taken 10 miles ont from 

 Cape Flattery, outside of where tidal currents sweep up and down the 

 Strait of Juan de Fuca. On the whole and in their averages these sam- 

 ples resemble the materials from the continental shelf in the Atlantic, 

 but contain a decidedly smaller amount of gravel and sand. It is be- 

 lieved this is due to the lesser strength of tidal undercurrents in the 

 western sea. 



List of Samples in Table 11 



155. Yellow sand and mud from 15 miles southwest of the coast of California, 



on the slope of the continental shelf. The sample contains fragments 

 of shells, black and white sand, and mica scales. Steamer Trenton; 

 Station No. 3187; latitude 36° 14' 0" north, longitude 121° 58' 40" 

 west ; depth, 288 fathoms. April 3, 1890. 



156. Gray sand, all inorganic, on the continental shelf, 10 miles from the 



coast of the northwest corner of the United States. Steamer All)a- 

 tross; Station No. 2872; latitude 48° 17' 0" north, longitude 124° 52' 

 0" west ; depth, 38 fathoms. 



157. Yellow sand and mud containing magnetite, mica scales, some black 



grains, with plates and spines of echinoderms. Steamer Trenton; 

 Station No. 3187; latitude 36° 14' 0" north, longitude 121° 58' 40" 

 west; depth, 298 fathoms. April 3, 1890. From 10 miles west from 

 the shore, off the middle of California. 



