66 NEW YORK STATE MUSEUM 



The formations between the Hudson and the Helderberg lime- 

 stones are better shown to the south of the Gebhard creek bridge 

 and residence, where the following section was measured. 



Feet 



III A 1 Clinton pyritif erous shales to creek level. Olive 19-19 



and bluish argillaceous shales in which are 

 numerous nodules of iron pyrites. During the 

 civil war a small mine was opened in this shale 

 i and worked for the iron pyrites. 



A 2 Niagara ("Coralline") limestone; the lower 7=26 



I and most massive layer is 4 feet, 5 inches; the 



middle one, 1 foot, 4 inches; and the top one 1 

 foot, 3 inches. 

 A 3 Covered slope, concealing the waterlime and 56=82 



lower part of the Tentaculite limestone. 

 A 4 Thin bedded, Tentaculite limestone. 11=93 



A 5 Pentamerus massive limestone; the lower 21 43=136 

 1 feet partly covered, and the upper massive 



ledge, 22 feet thick, by the highway; but the 

 entire thickness of the formation apparently not 

 shown. 

 The base of the Niagara limestone gives a dip of 12 feet s, 20° w 

 in a horizontal distance of 525 feet south along the creek bank 

 from the old mine. 



At " the Rocks " in the eastern part of Schoharie cemetery is 

 quite an extensive quarry in the Tentaculite limestone. In the 

 upper part of the quarry wall is the massive Pentamerus lime- 

 stone, forming a cliff extending along the side of the hill for some 

 distance. From the Tentaculite limestone in this quarry the 

 following species were collected. 



1 Tentaculites gyracanthus (Eaton) Ball (aa) 



2 Spirifer vanuxemi Hall (a) 



3 Chaetetes (Monotrypella) arbusculus Hall (c) 



4 Beyrichia notata Hall (a) 



5 Spirorbus laxus Hall (a) 



6 Leperditia alta (Con) Hall (a) 



