A. Wing's Discoveries in Vermont Geology. 341 



covered with the western branch of the Eolian limestone, and 

 the eastern with the eastern or Otter Creek branch. 



The preceding section is given by Mr. Wing to show the suc- 

 cession of formations across the whole limestone region, from 

 the Eed Sand-rock in Eastern Shoreham, to the quartzyte region 

 of Eastern Leicester, a distance of twelve or fourteen miles. It 

 shows the eastward dip throughout ; the narrow strip of slate 

 to the west of the middle ; and three sections of the Eolian 

 limestone east and west of this slate : a, Lower Calciferous ; b, 

 Upper Calciferous and Quebec; c, Chazy and Trenton; R S., 

 Red Sand-rock ; SI., slates; Q, quartzyte. How far this con- 

 clusion is based on positive facts will be seen beyond. 



On the east side of the slate in East Cornwall various fossils 

 were found in the limestone. These were sent to Mr. Billings, 

 who replied as follows : " The specimens from East Cornwall 

 east of Dr. Porter's residence, and from a locality farther north, 

 are Stenopora fibrosa, St. Petropoliiana, Escharopora recta?, part 

 of the rim of a Trinucleus or Uarpes, and species of Orthis, 

 Strophomena, Rhynchonella and Orihoceras ;" and he added that 

 "they are no doubt Trenton." 



North and south of East Cornwall, there are " Rhynchonella 

 beds" full of fossils, including pygidia of trilobites, a large 

 Much i, , Civics «i| Orthis. Encrinal disks, and other kinds; 

 and, half a mile south, one undoubted Baihyurus Saffordi, a 

 Quebec Group trilobite, was obtained. 



Near the west border of Cornwall, at Bascom's ledge (three 

 miles west of south of West Cornwall and three and one-half 

 miles east of Shoreham), a bed in the "Eolian limestone" is called 

 by Mr. Wing the " Trilobite bed," it being almost made up of 

 remains of trilobites, with other fossils. It afforded— as identi- 

 fied in 1867 by Mr. Billings from specimens sent him by Mr. 

 Wing— Asaphus canalis, besides two other species of the genus, 

 two or three species of Batkyurus, one of them B. conicus, some 

 °f the cephalic spines of this species, three, four, and, four and 

 one-half inches long, besides Maclurea matutina and other con- 

 voluted shells. Mr. Billings made the species Calciferous. 



East of Shoreham village the upper limestones hold Bathy- 



urns extans Billings (Asaphus f extans Hall), a Birdseye species, 



ria alveolata, of the Black River limestone, and the 



Trenton trilobite, Trinucleus concentricws. p 



Barbour's Ledge, in southern Bridport, near Mr. J. Barbour s 

 residence, affords similar fossils to Bascom's Ledge, including 

 many pygidia of trilobites of the species Asaphus canalis, and 

 Bathyun, and also, in an overlying bed, Maclurea matutina and 

 other convoluted shells and trilobites. 



The "Rhynchonella beds" extend from West Cornwall to a 

 mile or two south of Orwell, fifteen to eighteen miles. But m 



