GLACIAL AND POST-GLACIAL HISTORY 447 



VI. NORTH OF CAMELOT TO NORTH OF CATSKILL." 



From north of Camelot to Catskill the study of the deposits was 

 made largely in passage, so that the relations of the deposits to the 

 successive positions of the ice-edge cannot be stated. These fugitive 

 observations indicate a general higher altitude of the deposits next to 

 the valley side and a lower altitude next to the Hudson. They also 

 indicate an alternate increase and decrease in the elevation both in 

 he present Hudson bluffs and farther back from the river, and this 

 is interpreted as indicating more than one stand of ice in this area. 

 South of Poughkeepsie there is a pitted plain at 140 feet A. T. with a 

 steep descent toward the Hudson, the origin of which is unknown. 

 Gravel was observed at various points along the West Shore Railroad 

 from West Park to Ulster Park, at elevations of 100 and 140 feet 

 A. T. Clay was observed nearer Sou':h Rondout at 140 feet, and in 

 South Rondout clay underlies sand which has an elevation of 150 

 feet. At Kingston along the Hudson a sand-capped clay terrace 

 occurs 220 feet A. T., while farther west along the West Shore Rail- 

 road a plain at 180-200 feet A. T. is coated with sand and gravel 

 that are said to be underlain by clay. 



North of Kingston the clay has an elevation of 100-140 feet in the 

 Hudson bluffs, and a higher elevation west of the bluffs, where sand 

 covers the surface. At Glasco the clay has an elevation of 140 feet in 

 the river bluffs and 180 feet along the West Shore Railroad two and 

 one-half miles to the westward. At Saugerties and north toward 

 West Camp it has an elevation of 140-160 feet. At Catskill it has an 

 elevation of 100-120 feet, and a plain surface which has been trenched 

 by the Catskill and its tributaries. It has been described here by 

 Professor W. M. Davis, who has also described the delta of the Cats- 

 kill.^ 



Vn. NORTH OF CATSKILL TO NORTH OF GLENS FALLS. 



Old lake-jloor or old sea-floor. — In the Appalachian Valley part 

 of the Hudson north of Catskill, and perhaps from north of Pough- 

 keepsie the first approximation to a correct picture of the topography 



I For places mentioned in this division see Fig. i. 



^Proceedings of the Boston Society of Natural History, Vol. XXV (1891), pp. 

 318-35- 



