"Paleozoic." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/paleozoic>.
Paleozoic. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/paleozoic
Of, relating to, or being the era of geologic time from about 542 to 251 million years ago. The Paleozoic Era includes the Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, and Permian Periods and is characterized by the appearance of marine invertebrates, primitive fishes, land plants, and primitive reptiles. The end of this era is marked by the largest recorded mass extinction in the earth's history, in which 90 percent of marine life forms were wiped out. geologic time
The higher elevations are mostly either Archean or Paleozoic formations projecting above Tertiary deposits.
The crystallines are confined to the portion of the belt east of the Great Valley where Paleozoic rocks are always highly metamorphosed and occur for the most part in limited patches, excepting in New England and Canada, where they assume greater areal importance, and are besides very generally intruded by granites.
The Paleozoic sediments, ranging in age from Cambrian to Permian, occupy the Great Valley, the Valley Ridges and the plateaus still farther west.
==Geology== The rocks of the Appalachian belt fall naturally into two divisions; ancient (pre-Cambrian) crystallines, including marbles, schists, gneisses, granites and other massive igneous rocks, and a great succession of Paleozoic sediments.
Cretaceous Jurassic N k Bodorno :s: Vladikaukaz Lars `n - - - n ° Tiflis a =Plain of Vladikaukaz; b= Upper Jurassic; Moraine terrace; d= Folded lias shales; e = Upper Jurassic; = Paleozoic schists; Creenstone dykes; h= Granite; g°= Gneiss; i = Andesites; k = Jurassic?; I = Pliocene fNagelfluh); m = Miocene; 11 = Oligocene; r = Nullipore limesto n e & conglomerate.