PLEISTOCENE MARINE SUBMERGENCE 53 



delta tracts of coarse stuff, formerly mistaken for moraine, and 

 cobble bars in excellent development. 



Passing south from Shea's Lines the road lies on a boulder 

 moraine, at 760 feet, shown in plate 21. East and west of the low 

 ridge are shallow scourways, the latest and lowest definite channels 

 of glacial river flow in New York. The altitude of these channels 

 is 740 feet. The road crosses the west channel three-fourths of a 

 mile south of the boundary, and immediately south is seen some of 

 the coarse delta stuff dropped by this, or the preceding flow, when 

 checked by confluence with the marine-level waters. The White 

 School, by the corners leading to Rebideau's, is in another river 

 channel (plate 20), which has an altitude on the road of 720 feet, 

 10 or 15 feet beneath the marine plane. The delta stuff might 

 be mistaken for moraine. South of the White corners the road rises 

 slightly on the cobble delta, follows it for one-fourth of a mile and 

 crosses another bare rock channel at 720 feet. 



Strong cobble bars lie east of the road, the highest southeast of 

 the White .School at 735 feet. North of Cannon Corners the road 

 crosses a series of six bars, the highest being 720 feet and the 

 lowest, close to the corners, at 700 feet. This fine series of bars 

 curves about the slope and parallels the road northward. Cannon 

 Corners and the road leading west, up English river, are on very 

 coarse delta. The surface appearance is that of a bouldery 

 moraine, but the banks of the river cutting show its character as 

 torrent deposit. South of Cannon Corners one-third oi a mile is 

 another series of cobble bars, in altitude from 720 down to 700 

 feet, but behind the schoolhouse and at the corners of a west-leading 

 road is evidence of wave work up to 730 feet. These bars swing 

 to southward and continue in good shape for over a mile along the 

 slope of the delta on the east side of the road with an altitude oi 

 720 down to 712 feet. For one and one-half miles southward the 

 road lies on the delta, which suggests the amount of rock-rubbish 

 that the glacial drainage swept off from the Blackman rocks. 



The sand plain delta of the Chazy river, north branch, heads at 

 720 feet but declines to 660 feet 3 miles east, as shown by rem- 

 nants. From this locality the marine shore turns southeastward, as 

 shown in the map. 



The series of lower beaches, the Fran'klin Center shore line, is 

 very strongly represented on the north edge of the Mooers sheet, 

 in 42 bars of coarse material spaced over one and one-fourth miles. 

 Two miles southeast by English river the level is represented by 

 numerous weak bars. Southwest of Sciota the shore appears in 



