the Hudson and its Tributaries. 



313 



Rather more than half a mile southeast of the present Moodna, 

 the siphon will cross the impressive reversed fault which has 

 brought the Archean granite to rest upon the Hudson slate, as 

 is clearly exposed at one significant locality. A small drift- 

 filled channel has been met in the granite, but it is only worthy 

 of passing remark. Thence to the Storm King crossing the 

 aqueduct is located at grade. 



Fig. 7. 



Tributaries on the East Bank. 



Casper Creek. — The most northerly of the eastern tribu- 

 taries is Casper Creek, which enters the Hudson six miles 

 below Poughkeepsie. It was encountered by the proposed 

 Peggs Point route and tested with wash -borings, but as only 

 peat, sand, and at the bottom some gravel, were encountered 

 the results are fairly reliable. They are plotted in fig. 7. 

 The lowest point was minus 67. The section passed from 

 Wappinger limestone on the north to Hudson River slate on 

 the south. The section is perhaps half a mile from the 

 Hudson. 



Fig. 8. 



Fig. 8. -The Wappinger Creek Crossing. 



Wappinger Creek. — This good-sized stream enters the 

 Hudson just south of New Hamburg. Two miles back it 

 yields a fine water power by a series of cascades over Hudson 

 River slates, with a fall of 60 or 70 ft. The water power 

 supports the village of Wappinger Falls. Thence to the river 

 it forms an estuary at tide level. At New Hamburg it lies 

 along the contact of the slates and limestone, but while the 

 limestone appears with steep dips in the north bank, the drill 

 has shown slate beneath the water. There may be a faulted 

 contact; the relations are obscure. As shown in fig. 8, one 



