EVOLUTION OF IRONDEOUOIT VALLEY. 131 



Stand of Iroquois which its waters afterward overrode and partially 

 subdued. This is called" the Newfane beach. While seeking anew 

 in 1914 an explanation of the great northerly deflection of the 

 '"ridge" as it approaches the Irondequoit embayment from the west, 

 the Newfane bars were found at the road crossing on the Sea Breeze 

 trolley a mile and a quarter south of Lake Beach (Sea Breeze) at 

 the "Birds and Worms" station, just north of which ( between the two 

 cross roads) the trolley grade cuts through the beach. The trend 

 here is southwest, according with the curvature of the ridge proper ; 

 but just east of the trolley the beach ends in an acute angle from 

 which another limb or spit runs a short distance south to the margin 

 of the big gully. This A-shaped cusp apparently represents the de- 

 struction of a small kame island with the distribution of its materials 

 backward in two unequal "streamers". This is a kind of work that 

 might even have been done with the Iroquois waters at their full 

 height, in flie process of razing a small island or a shoal that stood 

 above wave base. But in any case the trend of the western limb of 

 the cusp is significant as showing the presence in that direction of 

 other land masses to which it could tie.^" These must have lain 

 somewhat to the north of the present ridge in the wave-planed area 

 between the 400 and 420 foot contours. Their contents were un- 

 doubtedly pounded slowly backward into the finished ridge. The 

 essential thing for us is the suggestion thev convey of a line of 

 kames, concentric with the Pinnacle series and probably the later 

 product of that same ice lobe, acting as the backbone for the out- 

 standing Iroquois bar through Irondequoit. Lying but little north 

 of the Dawson shoreline, they may be referred to the same ice pause 

 as the supposed esker fans at Allen Creek above noted. (Compare 

 Plate IV.) 



Inner beaches of Iroquois. Back (i. e. south) from the Ridge 

 Road bar lies the modified "initial shore" of full-height Iroquois 

 with the associated inner bars and cliffings. This strandline reaches 

 far south around the Irondequoit depression, limning a great bay, to 

 which the name "Pittsford embavment" has become attached 



9. See U. S. Geol. Survey Niagara Folio No. 190: p. 12 seq. 

 ]0. See .Tohnson's studies on Nantasket beach in Journal of C 



Geology Vol. 1>: p. 1G-. 



