A. Wing's Discoveries in Vermont Geology. 415 



The Trenton limestone has been identified west of or within 

 the "central slate-belt," at localities but a few miles apart, in 

 all the towns north of Castleton (the most southern on the map 

 g, in succession, Hub- 

 hardton, Sudbury, Whiting, Shoreham, Cornwall. We.\ bridge; 

 and east of the slate-belt, in Leicester, Eastern Cornwall and 

 •.stone adjoins the "central slate- 

 . belt" in West Rutland. 



6. The several Lower Silurian limestone formations lie in 

 north-and-south belts, with the lowest — the Potsdam and Cal- 

 ciferous — nearest to the Red Sand-rock, or to the Quartzvte, 

 and the upper— the Trenton or Chazy— nearest to the -central 

 slate-belt." This view is presented in the section from East 

 Shoreham to East Liecestcr on p. 340. 



This is confirmed as regards the Trenton limestone, "Sparry 

 limestone," by the list of its localities just mentioned. The 

 0haz\ "Rhynchonella beds"') so well represented b\ fossils at 

 rded fossils also in Leic* ster. East Corn- 

 wall, Middlebury, and the same fossils have been found on the 

 east, as on the' west, of the "central slate-belt;" while the 

 ''striped stratum," which is a marked feature of the Chazv.— 

 "a way-mark by which the rock can be recognized without its 

 fossils," occurs also in Middlebury, in the western part of Bran- 

 don bv the Burgess Field farm and along the quarries of this 

 part of the town, in the western part of Pittsford, and in North- 

 era Salisbury ; and "doubtless it reaches the marble <y 

 West Rutland, and continues south through Tinmouth and the 

 whole State ; and in this formation is embraced the Birdseye and 

 Black River limestones " "On Crown Point, Lake Champlain. 

 these 'striped beds' are largely developed at the old Forts, and 

 are perhaps 100 yards beneath the Black River limestone— 

 whether in the Chazy or Birdseye is not known. I 

 stratum of seemingly pure sandstone, resembling the Potsdam. 

 overlying them at Crown Point These facts may help to solve 

 the age of the same 'striped beds' in Addison County. 



The groups affording . ,t,e ^ es J 



. s of the xtea 

 ' localities north of Mid- 

 or where the limestone 

 and quart7yt^7ome"Togetnerr The "Ophileta beds," or those 

 referred to the Upper Calciferous, come next, being more remote 



- 

 The beds occur, with their ft *sik i« Salisbury, Leicester and 



Brandon 

 The eastern ran-e of limestone, or that forming the eastern 



margin of the great Eolian belt, a mile in width in many places 



