588 NEW YOKK STATE MUSEUM 



Tlie claj deposits of Hudson, Stockport and Stuyvesant are 

 like those at Coeymans Landing, being, overlain in most places 

 by a few feet of loam and nnderlain by dark sand and gravel. 

 At Stockport two ice-scratclied boulders were found in the clay; 

 one of tbem 3 feet in diameter, the otber three times as large. 

 To the north of Brousseau's yard at Stuyvesant the surface ma- 

 terial is stratified sand, 15 feet of it being exposed thus far. 



Recently a number of borings have been made in the Hudson 

 river clays in the interest of a syndicate, and these corroborate 

 most of the observations already published. One interesting fact 

 brought out by the sections is the abruptness of the face of the rock 

 underlying the clays. The borings in no case attempted to go to 

 the bottom of the deposit, but stopped when the sandy beds of clay, 

 that seem to constitute a lower member of the deposit, were en- 

 countered. (" Economic geology of the Hudson river clays," 

 C. C. Jones, Trans. Amer. inst. min. eng., Feb. 1899) 



The delta deposits of the streams tributary to the Hudson river 

 are extremely interesting. They give us an idea of the size of 

 the rivers flowing into the Hudson valley when it formed an 

 estuary, and also indicate the amount of depression which took 

 place at those localities. All three portions of a delta may be 

 observed in the ancient deltas on the Hudson; they are the thin 

 layers of loamy clay which form the secondary alluvial cone of 

 the delta, the cross-stratified sand and gravel and the overlying 

 unassorted material. This was observed at Haverstraw, I^J'ew 

 Windsor, Low point and Dutchess Junction. 



The following streams between ISTew York and Poughkeepsie 

 have formed delta deposits; (as noted by Dr Frederick J. H. Mer- 

 rill.-^) Wappinger creek, ISTew Hamburg; Fishkill creek; Indian 

 creek, Coldspring; Peekskill; Croton river; Pocantico river, Tarry- 

 town; Sawmill river, Yonkers; Tibbitt's brook. Van Cortland; 

 Minisceongo creek, Haverstraw; Cedar pond brook, Llaverstraw; 

 Moodna river, Cornwall; and Quassaic creek, Newburgh. At the 



1 Amer. jour. sci. June 1891. 3: 41. 



