438 CHARLES EMERSON FEET 



these particular places to the level reached in adjacent places. It 

 may be said that this relation is more clearly shown by phenomena 

 seen elsewhere. The facts in this locality are sufficiently doubtful, 

 at any rate, to justify caution in asserting the erosion origin of the 

 irregularities in the clay. However, there are some facts which seem 

 to indicate a considerable amount of erosion of the clay in this region 

 and subsequent deposition of gravel in the clay channels. 



Jones Point and State Camp near Peekskill. — ^At Jones Point a narrow 

 terrace less than a mile in length occurs on the right side of the Hud- 

 son. It is made up mainly of stratified gravel and sand and a little 

 clay, and formerly contained more clay.^ The terrace has an elevation 

 at its north end of about loo feet A. T., and at its south end of about 

 60-80 feet, and at present, in places at any rate, is higher toward the 

 Hudson than toward the valley wall. See Fig. 9, No. 19. 



At State Camp (28) near the mouth of the Peeks Kill there is a 

 gravel plateau with an elevation of 100 feet A. T. whose fiat top is 

 used by the New York state militia as a camping and parade ground. 

 This plateau continues up the valley of Sprout Brook with some 

 breaks, to a point about one mile northeast of Annsville (27), where it 

 has an elevation of 140-160 feet A. T. It was not studied beyond 

 this point. It also extends northward up the valley of the small tribu- 

 tary north of State Camp and southeast of Wallace Pond. Its greater 

 development occurs, however, at State Camp on the right bank of 

 Peeks Kill. A small remnant occurs farther upstream on the left 

 bank. While the plain surface as a whole rises upstream, the 

 northern portion of it at -State Camp slopes eastward — a fact of some 

 significance perhaps in determining the history of the plateau. 



The exposures in this plateau show gravel overlying clay. The 

 clay reaches higher above sea-level near the extremity of the plateau 

 than farther upstream, thus indicating a gradation of coarse materials 

 from upstream into the fine clay. Low-level terraces occur farther 

 downstream on both right and left sides of the stream at 30-40 feet 

 A. T. 



Roye Hook. — West of the plateau near the State Camp Station of 

 the New York Central Railway there is an isolated hill of small 

 dimensions, reaching an elevation of 100 feet A. T. This is called 



' See H. RiES, Tenth Annual Report State Geologist of New York, p. 114. 



