344 A. Wing's Discoveries in Vermont Geology. 



7. "Sparry Limestone," part of the "Eolian Limestone."— 

 Trenton. 



8. The slates of the "great central belt." — Hudson River 

 Slates (or, Cincinnati group). 



5. Northern <_'>>,•,< n-iilj ', llhldlebury, Weybridye. 



Wey bridge is the next town north of Cornwall, and Middle- 

 bury lies to the east of Southern Weybridge and Northern 

 Cornwall. The area of the Eolian limestone includes both 

 towns on the Vermont Geological Map. 



Ellsworth Ledge is situated in North Cornwall, two and a 

 half miles northeast of " Bascom's Ledge," and two or three 

 miles west of Middlebury. It is Mr. Wing's fifth fold. The 

 " great central slate belt," instead of stopping in Cornwall as 

 represented on the Vermont Geological Map, continues on, as a 

 narrow belt, and part of the way a double belt, to middle 

 Weybridge. 



base of Ellsworth Ledge (see 

 from Mr. Wing's notes) there is no 

 :r or Upper Potsdam, and No. 3 also is 

 formation is No. 4, the "Ophileta beds" 

 with their fossils; next No. 5, a, b, c, the "Trilobite bed " and 

 those associated ; next No. 6, the '• Rhynchonella beds," 

 - ils • ; then No. 7, or the "Sparry Limestone," with 

 fossils, this and the preceding of unusual thickness; and No. 

 8, the Hudson River slate. 



Overlying the " Conglomerate bed" (No. 5 b) there is a bed of 

 coarse limestones, (5 c) 100 or 200 feet thick, holding obscure 

 convoluted shells {Maclm-ea ?), a large Ort/iocerns and M •• " 

 sonia, and Bathyurus Saffordi, a species characteristic of the 

 Quebec group. 



Above this stratum come the "Rhynchonella beds," (No. 6) 

 -00 to 400 feet thick, containing, in a " striped stra- 

 ' ■ ," characteristic of it, Rhynchonella- (?) in great abundance, 

 i Asaphus canal's and of one or two other species of 

 Asaphus, pygidia of Bathy>mn A ,.,, /„/. a Ckrzv species in 

 Canada; also species of Maclunu, <>,■„.,. l.. r rdMn (a small 

 hand specimen containing them bv the thousands), Kncrum 

 stems, etc. This " striped stratum,"'twelve to fifteen feet thick, 



