716 



/. HOWARD WILSON 



DESCRIPTION OF BEDS 



No. i. — Light-gray sand; coarse and fine, more or less stratified 

 and sorted, with light-colored, clayey seams § inch thick, which are 

 somewhat ferruginous and hard. The coarse sand grains are rounded, 

 the smaller are more angular and appear fresher. Small pebbles 

 occur, mostly quartz, up to io mm (rarely 2o mm ), which are sometimes 

 incrusted with sand grains cemented by iron oxide. 



No. 2. — Ferruginous gravel ; 

 sand grains varying in size as in the 

 lower bed, the larger rounded, the 

 smaller transparent and mostly 

 angular; some rounded, and most 

 \ coated with the oxide of 



:"--!.. _ iron; mixed with them are 



\ small grains of hornblende 



;;.^^5-:f-- i and magnetite; contains 



Fig. 3 



coarse rounded quartz and other pebbles up to 8 cm . In an exca- 

 vation which was made through the talus 3 or 4 feet south from 

 this point, this 3-inch bed was found to be 1 foot thick, with a base 

 of hard, clayey sand, streaked with reddish-brown and blue clay. 



No. 3. — Size of quartz grains uniform with minute grains of 

 hornblende and magnetite. Quartz grains mostly angular, and 

 transparent, ranging up to 3 mm ; no pebbles; color slightly yellowish. 



No. 4. — Ferruginous gravel; -coarse and fine sand, and pebbles 

 of quartz and other material up to 25 mm , rarely larger; sand and 

 pebbles frequently cemented by iron oxide; pebbles and coarse sand 

 grains well rounded; finest grains of sand angular and transparent; 

 streaks of sand without iron ore are common throughout the bed; 

 grains moderately worn, and quite transparent; larger grains show 

 considerable grinding; black specks throughout, and small pebbles 



