66 NEW YORK STATE MUSEUM 



Faulted block number i. This block of limestone, which is 

 the most northerly of these masses, lies about a mile north of Man- 

 chester Bridge on the farms of A. W. Sleight and George Byer. 

 Its apparent northern boundary is along a northwest-southeast line 

 that crosses the Sleight farm just north of the barn and inter- 

 sects the roads to Pleasant Valley and to Overlook. About 75 

 yards south of the Overlook road, where this makes its first turn in 

 ascending the hill, the visible northeastern boundary of the lime- 

 stone is marked by a ledge. Its eastern boundary extends south 

 from here for about one- fourth of a mile. At the southeast the 

 limestone is represented by impure shaly limestone. At a point 

 just north of the wall between the Byer farm and Hart's orchard, 

 the slate outcrops and continues to outcrop to the south for a mile 

 or more. The slates are in close proximity to the limestone in 

 many places along the eastern border. Just south of the sheep pen 

 they form a scarp between which and the limestone the farm road 

 descends. The road is, however, apparently on the limestone. The 

 limestone outcrops just south of the farm road at the base of the 

 hill and continues as a steep scarp just within the woods northward 

 from this point for several hundred yards and then turns west and 

 crosses the road and ends in a large ledge 50 feet west of the road. 

 North from here it is finally lost under drift, but is readily fol- 

 lowed along the road toward Sleight's house. There are no out- 

 crops of any kind between Byer's house and barns, which stand on 

 a knoll of limestone, and the steep scarp 200 yards east of the road. 

 Ledges of limestone probably determined the terrace slope just 

 west of Sleight's house. Drift conceals outcrops north of Sleight's 

 barns. Quartzitic rock of the slate formation outcrops between the 

 Pleasant Valley and Overlook roads 100 feet north of the latter. 

 Between here and the outcrop of limestone marking the northeast 

 corner of the block there are no outcrops. Presumably the lime- 

 stone, in part at least, underlies the flat terrace level just east of 

 Byer's house. 



On the eastern margin of this block, partly on the property of 

 A, W. Sleight and partly on that of George Byer, is an old quarry, 

 which many years ago furnished stone for the abutments of the 

 bridge at Manchester. The fact that this is a rich fossil locality 

 appears up to this time to have escaped attention. 



There are two varieties of rock in the quarry. The one which was 

 quarried chiefly and which makes up most of the quarry is a dark 

 blue rock which varies in texture from a fine calcareous con- 



