Paleozoic

The Palaeozoic (or Paleozoic) era is the earliest of the three eras of the Phanerozoic. Its name means early life. It lasted from about 541 to 252 million...

†Cephalaspidomorphi (Paleozoic jawless fish) †Pteraspidomorphi (Paleozoic jawless fish) Gnathostomata (jawed vertebrates) †Placodermi (Paleozoic armoured forms)...

mya. It is the third period of the Paleozoic era and the Phanerozoic eon and the shortest period in the Paleozoic. As with other geologic periods, the...

(mya), and ended about 252 mya. It is the sixth and last period of the Paleozoic era and the sixth period in the Phanerozoic eon, and ended in the largest...

Phanerozoic eon started about 541 million years ago (mya). It is made up of the Paleozoic era (from the Greek for "oldest life"), the Mesozoic era ("middle life")...

sedimentary argillite, dating back to 1.7 billion years ago. During the Paleozoic, western North America lay underneath a shallow sea, which deposited many...

(jawed vertebrates) †Placodermi (Paleozoic armoured forms) Chondrichthyes (cartilaginous fish) †Acanthodii (Paleozoic "spiny sharks") Osteichthyes (bony...

The Ordovician is the second period of the Paleozoic era and the Phanerozoic eon. It lasted from about 485.4 million years ago (mya) to 443.4 mya. It...

about 359 to about 299 million years ago. It is the fifth period of the Paleozoic era and the Phanerozoic eon. In the U.S.A. the Carboniferous is divided...

estimated to have existed for over 300 million years, originating in the Paleozoic Era. Often misidentified as a silverfish is the house centipede, another...

only living members of this group. It was far more diverse in the late Paleozoic and contained gigantic species, including the griffinflies (or "giant...

The Devonian is the fourth period of the Paleozoic era and the Phanerozoic eon. It lasted from about 419 million years ago (mya) to about 359 mya. It...

paleontologist Charles Doolittle Walcott noticed differences in early Paleozoic benthic trilobites either side of the line which later was called the...

Almost any fossil-bearing limestone or shale from inland seas of the late Paleozoic tropics or subtropics is likely to contain some goniatites. "Devonian...

Cookson Hills. The rocks of the region are sedimentary layers of the Paleozoic age. The highest ridges and peaks are capped by Pennsylvanian sandstone...

northern England. These sediments were laid down in the late (upper) Paleozoic era, in the Carboniferous period, in deltaic conditions. The Millstone...

land under desert conditions. The massive extinctions that ended the Paleozoic era caused extreme hardship for the surviving species. Many types of corals...

345–357. [1] Niklas K.J. 1976. Chemical examinations of some non-vascular Paleozoic plants. Brittonia 28 (1): 113–137. [2] Fayers, Stephen R. & Trewin, Nigel...

Devonian. Non-tetrapod sarcopterygians continued until towards the end of Paleozoic era, suffering heavy losses during the Permian-Triassic extinction event...

an American–Canadian vertebrate paleontologist. His works focused on Paleozoic and Mesozoic amphibians and reptiles. He was born in Kalamazoo, Michigan...