hbeshby.i The River Terraces of the Orleans Basin. 



457 



and the valley widens to several hundred yards, including the 

 terraces on the slopes. The first terrace on the south side 

 appears to be a landslide deposit, It has an undulating' surface 

 several acres in extent at about seventy-five feet above the creek. 

 It stands in front of a small cove in the mountain slope, out of 

 which it has evidently slidden. It is bounded by a steep erosion 

 scarp on the valley side, which shows only angular rode debris. 

 The bed-rock surface on which it lies must be nearly or quite 

 down to the creek-level. From its position and subsequent 

 erosion on it, I place it in the same category as the older land- 

 slides upstream. 



At the lower end of this landslide there is the upper end of 

 a prominent terrace, whose surface, unlike that of the Modern 

 creek deposits, is even to a width of several hundred feet, but 

 slopes distinctly down the valley. Its height is about forty 

 feet above the creek, or twenty-five to thirty feet above the 

 Modern alluvium. On the mountain side it is bordered by a 

 steep bluff 50 to 100 feet high, and on the creek side by an 

 equally steep bluff, which displays well rounded creek gravel, 

 abounding in large boulders. Fragments of this same terrace 

 occur on the opposite side of the valley, and display some bed- 

 rock in the lower portion of the bank. It is evident that this 

 terrace deposit once floored a flat bottomed valley from 100 

 to 150 yards in width, but the creek has excavated in it and 

 possibly partly into the bed-rock below it, a steep-walled canon, 

 40 feet deep and 50 to 100 feet wide, which is floored by 

 the exceedingly irregular Modern creek deposits. These latter 

 rise mostly five to ten feet above the creek, with a few remnants 

 of a level nearly twenty feet above the stream. It must be 

 remembered that, from the glacial locality far up the creek to 

 the mouth, these Modern deposits have peculiar characters which 

 distinguish them, and there is no reason for confusing them with 

 older deposits. The forty-foot terrace just described bears such 

 a relation to these Modern deposits and to the higher and older 

 landslide terrace as constrains me to place it in the same cate- 

 gory as the lower terrace described from several points up the 

 creek, particularly a short distance below the North Fork Creek. 

 It appears that after the glacial, torrent fan and landslide 



