TILTING OF THE BEACH 361 



That there is a divergence in the beaches toward the northeast is cer- 

 tain, but the amount of divergence appears to be less regular than it 

 should be, though more regular than seems to be the case between Rich- 

 land and Watertown, in New York, as measured by Professor Fairchild. 



The question arises which of the several levels should be used in com- 

 paring with the single beach southwest of Quays, the lowest, the highest, 

 or some intermediate beach ? If we suppose that the northeast end of 

 the basin rose during Iroquois times, as seems probable, evidently the 

 continuation of the single beach found to the southwest must be sought 

 for in the lowest of the divided beaches, unless that resulted from a 

 cutting down of the outlet, as suggested by Professor Fairchild. In this 

 case, however, the beach should be split up all round the lake, and not 

 simply at the northeast end. It has been assumed therefore that the 

 lowest well marked beach at points northeast of the dividing line cor- 

 responds to the southwestern beach. Unfortunately the lowest beach 

 at some points does not fit very exactly in level with the lowest at other 

 points. 



Between Quays and Trenton, a distance of 18 miles in the direction 

 north 20 degrees east, the inclination of the lowest well defined beach 

 works out to 4.17 feet per mile. On the island north of Campbellford, 

 31 miles north 20 degrees east of Quays, the inclination, as compared 

 with Quays, is 3 9 feet per mile, but as compared with Trenton, only 

 3.41. The island west of Madoc junction, at its northeast end, gives, 

 when compared with Quays, an inclination of 3.92 feet per mile, but as 

 compared with Trenton, 5 feet per mile ; but for the lowest beach at Oak 

 Hill lake, 2 miles southwest, on the same island, the corresponding fig- 

 ures are 3.61 and 2.55 feet per mile. 



For the farthest island to the northeast (near West Huntingdon) we 

 have only the lower beaches, the island having been submerged in the 

 earlier times of high water. Taking the distance north 20 degrees east 

 of Quays at 36 miles and omitting a doubtful lowest beach at 440, which 

 would give an inclination of 3.58 feet per mile, we have, as compared 

 with Quays, deformations of 5 and 5.2 feet per mile for the two well 

 formed beaches at 492 and 498 feet above Ontario. 



The inclination of the lowest well defined beaches to the northeast of 

 Quays runs, as given above, from 3.61 to 5 feet per mile, with an average 

 of 4.17 feet, in contrast with 2 feet per mile on the southwestern stretch 

 and 3.4 per mile for the intermediate part. If the deformation increases 

 at a uniform rate toward the northeast, and if the lowest distinctly 

 marked beach is considered to be the continuation of the beach to the 

 southwest of Quays, we should expect, however, a tilt of about 5 feet 

 per mile, instead of an average of 4.17 feet. 



