Hkrshev.1 



The Hirer Terraces of the Orleans Basin. 



420 



slopes above are covered by a deep red soil in which pebbles occur 

 to the level of the flat. Indeed, the red soil of the flat contains 

 small gravel mixed with local debris. 



For some distance along the mining' ditch the bed-rock sur- 

 face varies from four feet above the wateiievel to several feet 

 below it, thus exposing the basal portion of the gravel. Except 

 for one or two small channels, like that described from the creek 

 ditch, the gravel is not thick or coarse. The bank has a deep- 

 red color to the very base of the gravel, 125 feet below the flat, 

 but this may be due largely to oxidation, since the lower layers 

 were exposed by erosion. Much of the waterworn fine gravel 

 scattered plentifully in the red soil to the top of the bank has 

 had a local origin. Back of the flat a long, gentle, curved slope 

 leads up to a small, rounded slate mountain whose altitude is 

 2,008 feet. 



The same gravel deposit is exposed along the flume on the 

 east side of Sims Gulch. Sims Creek has cut beneath the surface 

 of this deposit a V-shaped canon 150 to 300 feet deep. The soft 

 slate under the gravel was easy to erode. 



On the east side of Sims Gulch there is a rather narrow ridge 

 leading up from Tennessee Flat. Its summit is gently rounded 

 or slightly truncated. At first it shows slate debris and rock 

 in place, and higher it shows the old channel gravels. The cob- 

 bles and small boulders lying about on the surface have a rotten 

 and very ancient appearance. Higher yet the ridge shows only 

 local debris. 



The Donahue channel may be traced off to the eastward for 

 a long distance. Back of the Tennessee and Bacon Flats there 

 is a narrow belt of country having a general slope toward the 

 southwest, but it has been cut by a number of little creeks into 

 an undulating tract. The banks of these little creeks show 

 waterworn river gravel embedded in red sandy clay, and the 

 same cobbles and pebbles are scattered about on the soil alone' 

 the belt, 



Along the mining ditch at the point where, going upstream, 

 it passes into the deep valley of Camp Creek, there is rather fine 

 waterworn gravel (no boulders) in the bank just above the ditch. 



On the south of the river and north of Pearch Creek, there 



