Period- 



__ 

 Long 



Strata 



Organic History 



period of disturbance during which the Appalachian and other regions were elevated, largelj 

 denuded and some of them sunk again to receive the Mesozoic deposits. 



End of Trilohites, Gonia 

 tites, Eurypterids and Pro- 



ductus 

 Proterosaurns. 



Labyrinthodonts Liniuloids 

 Sauroid Fishes Macrou- 

 Scaled Amphib- runs 



ians Insects 



Hybodont Sharks Orthop- 

 Snails ters and 



Myriapods Arachnids 



Ferns Conifers Lycopodia 

 Uncouforruabliity 



Cestraciont Sharks (Clado- 



dus, frc.) 

 Reptile Tracks (Amphibian) 

 End of all the old genera of 



Trilobites 



1JKK) Feet Denudation 



5,000,000 Years 



Catskill 



Cheimmg 



Hamilton 



1.1 



Corniferous 



Oriskany 



Heklerberg 



Salina 



Niagara 



Holoptychius (Ganoid) 

 Tderpeton 



Salamandroid Amphibian 

 No Vertebrates 

 Few New Shell Fish 

 Noeggerathia (Sea Weed) 

 Calamites 



Insects (Neuropters), Gonia- 

 tites (Ammonites), (No Ver- 

 tebrates), Lepidodeudron 



and Sigifiaria 



Ptericthys (Ganoid), Sela- 

 chians.Ganoids.Pentremites 

 (Crinoids), Productus, Caucla 

 Galli (Sea Weeds) Desmids 



New Species 

 End of Cystids 



Euryi)terus remipes (Cms 



tacean) 

 Tentaculites 



Few New Species 



Bnchlopod Pentamerus (Or- 

 moceras ends). New Fucoid 

 Rusophycus Bilobatus 



~ Period of elevation and denudation to the amount of 2,000 feet, requiring 10,000,000 years. 

 ,| 2,250 species become extinct. 



Hudson 



Trenton 



Potsdam 



New Species of Those Below 



Nautilus, Cryptoceras, Star- 

 fish. Ormoceras, Cyrtoceras, 

 Cystids, Corals, Maclurea 



Bryozoans, Conchifers, Os- 

 tracoids, Orthis, Khynconel- 

 la, Lituites, Orthoceras, Tri- 

 lobite, Marine Gasteropod, 

 Lingnla Pteropods, Worms, 

 Discina, Crinids, Graptolites 

 Sponges and Rhizopods 

 Fucoid Sea Weed 



uterval, in 



which the Eozoic rocks were raised slowly out of the water, planed off 6,000 feet, and 

 sunk again to receive the Silurian deposits. (6,000x5,000) 30,000,000 years. 



Huronian 



Laurentian 



Graphite 

 Eozoon 



Iron Ore Deposits 

 Algae 



FIGURE 70, 



