Paleozoic Era 541 - 252 289
Carboniferous Period
358.9 - 298.9 60
Pennsylvanian Subperiod
323 - 298.9 24.1
Gzhelian Stage 303.7 - 298.9 4.8
 300 - 0 Inshore hagfish, Eptatretus burgeri, Eptatretus, Myxinidae, Myxiniformes, Myxini, 5Sp W Pacific ocean, NT 1855
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 300 Etacystis, Etacystis communir, Etacystis, Pterobranchia?, Hemi?, Eumetazoa 1976 W USA |
 300 - 280 20 Sphenacodon ferox, Sphenacodon, Sphenacodontinae, Sphenacodontidae, . "Wedge point tooth" 3Sp 1878 USA |
 _ ant, bee, beetle 🐞/22 Trachelismus tenuissimus Philippines Present .png) 300 - 0 Trachelismus tenuissimus, Trachelismus, Trachelipodidae, Oniscidea, Isopoda, Malacostraca, Crustaca, Arthropoda Philippines |
 300 Iniopteryx I. rushlaui, †Iniopteryx, †Iniopterygiformes, Chondrichthyes, "Nape wing" N America |
 300 - 295 5 Eryops E. megacephalus, †Eryops, †Eryoptidae, †Temnospondyli, "Drawn-out face" N America |
300 Arches Nat. Park events that led to the arches, fins, and other rock shapes seas periodically covered the area. salt beds up to 5,000 ft (1,524 m) thick in some places. |
300 Garden of the Gods 3,318ac/13.43km2 Shawnee National Forest, Illinois. |
345 - 295 50 Arthropleura †Arthropleuridae, †Arthropleurida, Diplopoda, Arthropoda 7Sp 1854 |
300 salt bed Paradox Basin Colorado Plateau Ks' thick in places |
300 - 243 57 Marine Isotope Stage 8 |
300 - 280 20 Sphenacodon "wedge point tooth" †Sphenacodontinae, †Sphenacodontidae, Synapsid 3Sp 1879 |
 300 - 280 20 Edaphosaurus poganias Pavement lizard Edaphosaurus, Edaphosauridae, Sphenacomorpha, Haptodontiformes, Eupelycosauria, Synapsida, Amniota, Rpetiliomorpha, Tetrapoda, USA |
306.9 - 298.9 8 Megarachne
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299 - 252 47 Aulacephalodon bainii, †Aulacephalodon, †Geiiidae, †Dicynodontia, Therapsida, Lower Beaufort Group of the Karoo Supergroup of South Africa and Zambia. medium-sized dicynodonts, or non-mammalian synapsids. dominant terrestrial vertebrate herbivores 1898 |
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Permian Period 298.9 - 251.9 47
Cisuralian Epoch 298.9 - 272.3 26.6
 298.9 - 272.95 25.95 Glossopteris browniana, Glossopteris, Glossopteridaceae, Glossopteridales, Pteridospermatophyta, Tracheophytes S hemisphere. 6Sp |
 298.9 - 272.95 25.95 Ctenospondylus casei, "Comb vertebra" †Ctenospondylus, †Sphenacodontinae, †Sphenacodontidae, 2Sp USA |
 298.9 – 251.902 47 Menaspis armata, Menaspis, Holocephali, Chondrichthyes, Germany |
 298.9 - 272.95 25.95 Discosauriscus pulcherrimus, †Discosauriscus, †Discosauriscidae, †Seymouriamorpha, 2Sp 1879 Czech Republic |
 299 - 251 48 Diplocaulus "Double caul" †D. magnicornis, †Diplocaulus, †Diplocaulidae, †Nectridea, †Lepospondyli, 5Sp Morocco |
Sakmarian Age 295 - 290.1 4.9
 295 - 272 23 Dimetrodon "Two measures of teeth" D. limbatus, †Dimetrodon, †Sphenacodontinae, †Sphenacodontidae, N America & Germany |
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Paleozoic Era 541 - 252 289
Permian Period 298.9 - 251.9 47
Cisuralian Epoch 298.9 - 272.3 26.6
Sakmarian Age 295 - 290.1 4.9
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Artinskian Age 290.1 - 283.5 6.6
290 El Capitan Texas reef surrounded much of the Delaware Sea S New Mexico and Trans-Pecos Texas |
290 Helicoprion bessosnowi Spiral saw Oceans worldwide |
290 Gerobatrachus hottoni Elder frog Texas N America |
Diadectes & Trimerorhachis 290 - 272 18 N America |
289.9 - Present Bocydium globulare, Bocydium, Membracidae, Hemiptera, Insecta, Arthropoda 1803 Worldwide Brazilian treehopper |
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Paleozoic Era 541 - 252 289
Permian Period 298.9 - 251.9 47
Cisuralian Epoch 298.9 - 272.3 26.6
Artinskian Age 290.1 - 283.5 6.6
 285 - 272.3 12.7 Secodontosaurus obtusidens Cutting-tooth lizard Texas USA Early Permian |
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Kungurian Age 283.5 - 272.3 11.2
275 Nikkasaurus N. tataronoovi, †Nikkasaurus, †Nikkasauridae, †Biarmosuchia, Therapsida, is an extinct genus of therapsids. insectivorous |
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Paleozoic Era 541 - 252 289
Permian Period 298.9 - 251.9 47
Cisuralian Epoch 298.9 - 272.3 26.6
Kungurian Age 283.5 - 272.3 11.2
 280 - 270 10 Seymouria baylorensis Baylor Country N America and Europe Early Permian |
280 Angelosaurus 'Angel lizard', Olson & Berrbower 1953 pelycosaur Reptile. Angelosaurus dolani 1 partial skull M San Angelo Formation, Knox County, Texas, USA |
280 - 270.6 9.4 Captorhinus captorhinid Reptilia Oklahoma, Texas, Europe, India, Pedra de Fogo Formation, Parnaiba Basin, Brazil & Mdumabisa Mudstone, Zambia |
 279.5 - 272 7.5 Cotylorhynchus romeri, †Cotylorhynchus, †Caseidae, †Caseasauria, 3Sp 1937 USA |
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Paleozoic Era 541 - 252 289
Permian Period 298.9 - 251.9 47
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