A. Wing's Discoveries in Vermont Geology. 345 



is overlaid by an inch or so of a dark slaty sandstone and then 

 by a stratum of white limestone (weathering yellow) six to 

 twelve inches thick. These "Bhyuchonella beds " are without 

 much doubt Chazy in part; the "upper part may be Birdseye 

 and Black Biver. Since the Birdseye and Black Biver do 

 certainly exist in Orwell and half a mile east of Shoreham 

 village, there is not much doubt that they exist here also. 



The " Sparry limestone " does not here afford fossils. The age 

 of the rock is inferred from the fossiliferous beds farther south 

 in similar position in Cornwall, Sudbury, Hubbardton, the facts 

 respecting which have been already mentioned. ■■Trenton lossiln 

 occur also in Benson, and on the same strike in Whitehall, 

 New York ;" so that " it is no longer to be doubted that the Tren- 

 ton limestone does exist in long bands stretching down on the 

 west side of the two belts of slate from Weybridge southward." 



At Weybridge Upper Falls, on the right bank, the "Bhyn- 

 chonella beds " occur west of the slate, beneath the " Sparry 

 , limestone;" and the "striped stratum," which is partly cut 

 through by the stream, is full of fossils, as first observed in 

 1867; and the species are the Ban md convo- 



luted shells that* were found in the " Bhynchonella beds" west 

 of the slate in Cornwall— a fact which makes the two beds 

 identical in age. On the south side of the Falls occurs Retepora 

 incejjta. This makes the beds to be of the age of the Chazy, 

 and proves that the Chazy formation has a wide range, the 

 beds in Cornwall affi >r . Bathyurus Angelini, 



leperditia, etc., as already stated. "No marble quarries in 

 Addisou county have been wrought in the Quebec Group; all 

 are now wrought in the Cbazv and formations above it, or in 

 the sheet of limestone at the bottom of the Calciferous." 



In Middlebury, the "Sparry limestone" affords "very large 

 and eonspii m; they occur mostly near the 



slate, like the few other fossils of this slate." The formation is 

 * continuation of that of East Cornwall. 



The limestone bordering the "central slate belt on the east, 

 is the same formation with that on the west This has been 

 proved by the fossils, as alreadv stated. It is also shown by 

 .ate, which extends south from 

 Weybridge to join the wider belt of the southwestern part of 

 i n the north part of 

 Sudbury, the cut beino- 40 or 50 rods wide, as stated on page 

 8 39. "The limestone°at the break is certainly not lower than 

 the Chazy and Trenton, and it is continuous with the 



■ - T.: . ...:. • ..; .- .;. - .-.--' 



of Otter Creek vallev on the other ; and hence the limestones 

 °n the east of the slate, in Otter Creek valley, must be of the 

 same age as those on the west." 



