40 NEW YORK STATE MUSEUM 



drive, are two or three good-sized ledges. Farther up the hill on 

 Mountain street at the point where it forks, going east, is an outcrop 

 of the quartzite. This was first interpreted as a boulder, but the 

 proximity of this rock in place farther down the hill suggests that 

 it is a small ledge which has been preserved. These outcrops are 

 the only ones which were noted in this town, after a careful search, 

 which were referable to the quartzite as typically developed in this 

 quadrangle. 



As has been discussed above, there is strong reason for thinking 

 that certain phases of the gneiss owe their peculiar character to 

 the subaerial decay and partial sorting which took place during the 

 epoch of the transgression of the sea in which the quartzite was 

 laid down, and are therefore of the same general age. 



At Vly mountain a small patch of the quartzite has been pre- 

 served just north of the road on the south side of the mountain at 

 the summit of the hill as the road descends into the swanip, going 

 west. 



A careful search was made along the northwestern base of Bald 

 hill from the Maddock farm to the northeastern end of the spur. 

 The topography between the more precipitous portion of the hill and 

 Fishkill creek often suggests the presence of the quartzite. Out- 

 crops are few and the gentler basal portions of the slope are usually 

 drift-covered. The foliated Bald hill gneiss outcrops in places north 

 of the Maddock residence between it and the farmhouse at the north- 

 east. Outcrops are absent at the base of the gneiss to the northeast 

 of this farm, nearly to the end of the spur. The ledges of gneiss often 

 rise precipitously from the edge of the gentler portion of the slope 

 and the bases of the scarps are hidden by abundant talus which, in 

 many cases, doubtless forms the gentler slopes. Near the extremity 

 of the spur, due south from Fishkill Village, a ledge of the quartzite 

 was discovered in the woods near the edge of the gneiss. The gneiss 

 extends to the north of this ledge. 



The Bald hill thrust carried the quartzite with it in places before 

 the rupture occurred and in these places a characteristic quartzite 

 slope has been preserved. Only a few scattered ledges now mark 

 the former presence of this formation in the eastern part of the 

 town of Matteawan. The small ledge near the extremity of the spur 

 seemingly belongs with the upthrow block and probably rests by 

 thrust against the limestone. It is a question whether the precipitous 

 ledges of the gneiss northeast of the Maddock farmhouse rest 

 against the quartzite or the limestone. 



