222 



the piling np of the great load of silt within Bean Blossom by the trilju- 

 tary, but did not succeed in building it up to the lake level; in other Avords, 

 it is an incomplete delta, or bar. 



The Wolf Creek case differs from the former only in having a moder- 

 ately flat top, or at least the higher flats on it attain about the same level, 

 thus suggested that it was built iip nearer to water level, and hence more 

 even and uniform in relief. These differ from the rim.ming benches only 

 in that they extend across the valley floor, while the former, being made 

 by smaller streams close to each other, have built a series of small benches 

 or deltas which have become confluent, and hence continuous along the 

 valley side." 



The delta material is derived from the disintegrated rocks of the adja- 

 cent uplands or is of glacial origin or is of both glacial and residual debris 

 according to the source of the tributary and the proximity of the foot 

 of the ice-sheet. The ice-sheet entered both Canada and Hubbard's gaps 

 and at several places between these two gaps its foot rested on top of 

 the Bean Blossom Creek— White River divide. Consequently glacial mate- 

 rial is to be found in the deltas of Indian and Honey creeks leading south 

 from these respective gaps. Below are sections from some of the most 

 conspicuous deltas of the area: 



Sections taken on the Buck Creek delta: 



Section 1.— Well on Dolan road one mile north of Dolan. 



Feet. 

 1. Yellow clay 18 



Section 2.— Well on Dolan road, one-half mile north of Dolan. 



Feet. 



1. Black soil 1 



2. White sand 6 



3. Yellow clay 15 



Section 3.— On A. Oliver's place on the Dolan road one mile north of 

 Dolan. A well was once dug here through yellow clay for 47 feet. 



Section 4.— Solomon Laughlin's well about a mile south of Dolan. 



Feet. 



1. Clay and sand 36 



2. Solid rock ? 



