8o 



NliW YORK STATE MUstUM 



Portland. We have here a clear example of a delta deposit, 

 wholly by glacial drainage. As no large land stream enters here 

 the great detrital plain which is a mile wide at Portland and stretches 

 southwest for 3 miles was entirely the work of glacial rivers, specially 

 the great river which cut the remarkable channel, 8 miles long, 

 heading at Wheelers Gulf 3 miles south of Fredonia. 



Lamberton. The sand deposits south of the village and extend- 

 ing toward Brocton were partly built by the lower streams on the 

 slope south of Fredonia. 



Laona. The conspicuous terraces on the valley slope west of 

 the village [see p. 21] are clearly the delta of the high-level rivers 

 from the northeast. 



Fredonia. The upper part of the valley filling, or south of the 

 town, is partly the product of the later ice drainage on the lower 

 slope east of the town. 



Northeast of Fredonia for 3 miles the bars are heavy, the material 

 being swept in by the later drainage on the slopes south of Sheridan. 



Forestville. The village stands at the head of a delta which 

 extends 5 miles north, to Silver Creek. The work of the ice drain- 

 age and of Walnut creek has been combined here. The capacious 

 channels in the direction of Smiths Mills must have brought in a 

 large volume of detritus, and the ancient valley north of Forestville 

 may be deeply buried. 



Gowanda. Some of the detrital filling in the Cattaraugus valley 

 was contributed by the ice drainage on the slope east and south 

 of North Collins. 



Brant. The sand area at Brant is so extensive that it suggests a 

 delta deposit, but it is so far removed from the area of drainage that 

 its correlation is not clear. It may in part form an extension of 

 the sand area west of North Collins, and be derived from the 

 drainage past Eden. 



Eden. The sand area west and northwest of Eden, and at Eden 

 Valley, would appear to be a delta produced by the streams on the 

 slope south of Hamburg. 



Hamburg. The delta plain at Hamburg must have been partly 

 the product of the glacial drainage on the northeast, or south of 

 Orchard Park. 



East Aurora. The plain on which the village stands was built in 

 glacial waters, either Whittlesey or earlier local waters, by drainage 

 from the northeast. 



East Elma. The plain northeast of the village was built in the 

 glacial waters by the several streams which cut across the moraine 

 from the east. This plain may have been the latest delta filling 



