REPORT OF THE STATE PALEONTOLOGIST 1902 



1035 



generally stained with iron hydrate, and at the Burden iron 

 mine this rock is in intimate association with the iron ore. 



Davis described this rock, 1 assigning to it an age " apparently 

 younger than the Helderberg series, and certainly .much older 

 than the drift." He thought that the limestone fragments 

 " seem to correspond with the several subdivisions of the Lower 

 Helderberg." He found it at two localities, one in the meadow 

 south of Academy hill and one in the fields a quarter of a mile 

 south of the southern end of the mountain. It is well exposed 

 on a little stream which enters Olaverack creek at a point 

 about east of that where fault 16 strikes the eastern bounding 

 road of the mountain. The stream lies on a fault line. It has 

 cut back some distance from Claverack creek and forms a fall 

 over the hard conglomerate, which fall has been utilized as a 

 site for a dam and mill. The conglomerate bed is about 10 feet 

 thick at the fault. It dips northeastward and abuts against 

 what are probably the Normans kill shales, which have a similar 

 dip. The conglomerate increases in thickness away from the 

 fault and forms a prominent hill between the road and the 

 stream. It is underlain gj^ 

 by shales similar to those ^g 

 on the opposite side of ^gf; 

 the fault [fig. 2]. 



The age of this con- 

 glomerate is unknown. 

 That it belongs to the 

 Hudson river series is un- 

 doubted, but whether 

 older or younger than and Nonnanskm shales (6) 



the Normans kill shales, has not been ascertained. No fos- 

 sils have been noted in the pebbles of limestone, though 

 some search has been made for them. The position and char- 

 acter of the bed indicate that the rock is older than the beds 

 composing Becraft mountain, for all these beds with the ex- 

 ception of the Manlius are highly fossiliferous and easily 



Am. Jour. Sci. 1883. 26:382. 



