224 



PROCEEDINGS OP THE AMERICAN ACADEMY 



TABULAR VIEW OF THE TACONIC SYSTEM IN EASTERN 



NORTH AMERICA. 



Saratoga limestone. 





i'eet. 

 lOU 



Dikelocpplialus, Lonchoceijhalus, Cre- 

 piccphalus 



Lingula. 



Red Sandrock of Ver- 

 mont and Keeseville. 



300 



Conocephalites Adanisi, C. niinutus, 

 C. vulcanus, Lingulepis, Obolella 

 prima. 



Upper S wanton slates 

 or Quebec group of 

 the city and citadel 

 of Quebec, Charles- 

 bourg, and Mont- 

 morency's fall. 



2,G00 



Almost destitute of fossils. 



Lower Swan ton slates 

 or slates between 

 Swanton's fall and 

 the shores of Lake 

 Champlain. 



2,400 



Graptolites at Swanton's fall, and at 

 the ferry road of Point Levis, River 

 St. Anne, and Gros Maule (Canada). 



Colonies of the second fauna at llighgate 

 S])ring, with Triiuicleus, Calymcne, 

 Anipy.x, Ortliis, Rhynciionella, etc. 



Pliillipsburgh orPoint 

 Le'vis Group. 



3,000 



Dikclocephalus, Olenns? Conocepha- 

 lites, Arionellus, Batliyurus, Me- 

 nocephahis, Amphion, Cheirurus, 

 As.'iphus, Illo?nus, Lituites, Nautilus, 

 Orthoceras, Maclurea, Murchisonia, 

 Metojttonia, Kccuiioniplialus, Came- 

 rella, Leptsena, Orthis, etc. 



Georgia slates, 



or 

 Olenellus Zone. 



400 



Olenellus Thompsoni, Ol. Vermontana, 

 Dikclocephalus? Angelina, Conoceph- 

 alites, Orthisina, Camerella, Obolella. 



c 

 o 

 N 

 m 

 <u 





St. John or Acadian 

 Group (New Bruns- 

 wick). 



■2,700 



Paradoxides Acadicu.'s, Par. Eteniinicus, 

 Par. lanicllatus; Conocephalites (14 

 species), Agnostus (2 species), Mi- 

 crodiscns, Ellii)t()cephiilus, Lingula, 

 Obolella, Orthis, Disciiia, Kocystites, 

 Salterella, Hyolithes.and Orthoceras. 



Argillites of Brain- 

 tree, Mass., and St. 

 Mary's Bay, New- 

 foundland. 



Eophyton sandstone 

 of Great Belllsland 

 (Newfoundland). 



300 



Paradoxides Ilarlani, P.ir. Bcnnettii, 

 Par. decoris, I'ar. teneilus; Arionel- 

 lus, Agraulos, Anapolenus, Obolella 

 miser. 



I,o00| Eophyton Linn;ranum, E. .Tukesi, Ar- 

 thraria, Lingula, Lingulella, Cruziana, 

 Iphidea, Pakeophicus, 



Aspidclla and Areni- 

 colites slates of St. 

 John's, Newfound- 

 lan.l. 



1,000 



AspidellaTerranovica, Stenotlieca, Sce- 

 nclla, Arenicolites si)iralis. 



Greenish and bluisli slates, quartzites, and conglomerates, trappean or diabase 

 beds, and volcanic ash ? 



