520 NEW YORK STATE MUSEUM 



sandstone, those of paler color passing into white are shown in 

 the upper exposures along the creek for 1J miles south of the 

 village. From Holley to Clarendon the Medina extends for ap- 

 parently about 2 miles but aside from the creek section is 

 covered. 



Clinton beds and Rochester shales. At Clarendon (station 23) 

 and along the escarpment west of the east branch of Sandy 

 creek are noteworthy exposures of Clinton limestone, continu- 

 ing from just north of the village to 1J miles to the south. 



Other exposures of Clinton limestone were not observed and 

 the topography soon becomes depressed so that the existing 

 Rochester shales are, so far as our observations extended in 

 this section, concealed. 



Lockport dolomites. At about 1J miles south of the last ob- 

 served exposure of the Clinton limestone, just north of the set- 

 tlement known as Honest Hill, and to the west of the highway 

 leading to Byron, is a small quarry on the Arnold farm from 

 which thin slabs of gray, comparatively pure or slightly 

 dolomitic limestone have been taken and this rock seems to per- 

 tain to the base of the Lockport dolomitic series. The country 

 here enters the eastern arm of the Oak Orchard swamp and 

 other outcrops are here concealed, the only additional evidence 

 of the presence of the dolomite series being found at the south 

 edge of this swamp land where occasional accumulations of the 

 scraggy upper dolomites are to be observed. At one point just 

 north of Pumpkin hill on a northerly branch of Black creek 

 these layers were at one time brought together and burned for 

 lime, the kiln and piles of accumulated material still being in 

 evidence. After passing the probable southern limit of the 

 dolomite area approximately along the course of Black creek,, 

 the country becomes so low and marshy, specially to the east 

 in the direction of Bergen, that no outcrops are afforded 

 and from Byron to Elba a distance of 6J miles, and from Elba 

 north to Langton Corners, 1 mile, and from there north L| miles- 

 to the east and over various points along that road southward 

 to East Oakfie'ld and thence to Oakfield village, no outcrop could 



