132 ROCHESTER ACADEMY OF SCIENCE. 



although precisely speaking Pittsford village does not lie therein 

 and but the margin only of the town of Pittsford. 



Not everywhere along this inner shore can unequivocal marks 

 of water action be made out, but the silt plains soon to be described 

 serve as a valuable index in its exploration. At the west edge of 

 our map the initial shore. is against the attenuated Niagara escarp- 

 ment, with rock exposures due to the surf. Coming east, to and 

 across Portland Avenue, the shore is masked by the dunes of the 

 Heffer sand-pits. When it emerges from these it begins to bear 

 away southeastwardly, diverging from the Ridge until it lies a mile 

 back from it at Woodman Road. In this short stretch are developed 

 the best of the inner beaches, either because this was an exposed 

 shore in the earlier stages of Iroquois before the completion of the 

 sheltering Ridge, or else since even afterward it was the least pro- 

 tected portion within the Pittsford embayment. The beaches here 

 are not only strong but at one point they become complicated and 

 nuiltiple. 



East and south from Woodman Road the work of Iroquois 

 waters has been recognized at the following points : ( 1 ) On 

 Densmore Creek just south of Norton Street where a small bar built 

 from the southeast has deflected the stream on the 420 contour ; a 

 delta fills the space behind; (2) Extending from the preceding to 

 the end of Norton Street the shore cliff is finely concaved, terminat- 

 ing with a dee]) notch in the sandy promontory ; on the east side small 

 pits have been opened in the beach deposits; (3) Next southwest, 

 where a road crosses the (ilen Haven brook, are other gravel patches 

 partly obstructing the Iro(|Uois mouth of that stream; (4) Half a 

 mile south of Clififord Street a semicircular bar, concave northward, 

 swings across 'the Glen Haven (Sodus) railway to a drumlin island 

 (Ely hill) on the east and ties it to the mainland; the blind road of 

 the map is the chord of its arc, permitting several houses and barns 

 to stand upon it or its flanks ; this was the first bit of the inner shore 

 to be discovered by the writer. (5) The north end of the same drum- 

 lin, along Winton Road, is sharply notched, with traces of a small 

 spit on the east slope ; ( 6) On Atlantic Avenue east of Winton Road 

 two successive drumloid ridges show wave action ; the second one, 

 just above the "dugway" hill, baring the limestone in the roadway; 



