StRATlGRAPHY O^ MOHAWK VALLEY At^lD SARATOGA CO. 4?3 



Feet 



part of the cascade is formed by a massive layer 4 feet, 



8 inches in thickness extending to the base of the 

 upper part of the cascade. The rocks forming the 

 upper and lower parts of this cascade have a thickness 

 of 26^ feet. Calciferous formation. 92=164 



P Drab colored limestone under highway bridge. 

 Birdseye limestone. The base rests on top of the 

 Calciferous impure limestone in the bed of the creek 

 and the top is shown in the vertical ledge of rock 

 under the bridge. 5^=169! 



I* Dark gray to blackish lumpy limestone about 

 7-J feet thick. Black river Hmestone. 7i='^77 



P Thin bedded, dark blue limestone extending 

 above the house of Mr John Swarts. Part of the 

 layers are very fossiliferous. Trenton limestone. 43=220 



P Some 2 feet of black argillaceous shale in the 

 creek just above the Swarts barn. Utica slate. 2=222 



To the north of the creek on the Swarts farm is a small quarry 



in the Birdseye where 5J feet of this limestone is shown capped by 



the Black river. Along this terrace for one mile from Swartstown 



creek to that opposite Crane's village there are quite frequent 



outcrops of the Birdseye and Black river limestones in which a 



number of quarries have been opened. The Birdseye limestone 



is shown in this ledge to better advantage than at any other locality 



in the lower Mohawk valley, specially in the woods about south 



of Crane's village near the old Phillips quarry. The limestone 



is light drab in color, very compact and fine grained and contains 



numerous and beautiful specimens of Phytopsis tubulosa 



Hall; in every respect this is typical Birdseye limestone. The 



southern wall of an old quarry in this terrace about south of Crane's 



village gives the following vertical section : 



Feet 



46K^ Lower part of quarry wall apparently rest- 

 ing on the Calciferous limestone. Birdseye. 7i= 7i 



K2 Very dark gray or blackish lumpy limestone. 

 Black river. 76=iSt 



K^ Very fossiliferous, thin bedded, blue limestone; 

 5 feet, ID inches in the eastern and 8 feet, 10 inches in 

 the western part of the quarry wall. Trenton lime- 

 Stone. 8i==24^ 



