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 Wedge point tooth Sphenacodon, Sphenacodontinae, Sphenacodontidae 3Sp 1878 USA |
 _ ant, bee, beetle 🐞/22 Trachelismus tenuissimus Philippines Present .png)  _ ant, bee, beetle 🐞/22 Trachelismus tenuissimus Philippines 300 - Present .png) 300 - 0 Trachelismus tenuissimus, Trachelismus, Trachelipodidae, Oniscidea, Isopoda, Malacostraca, Crustaca, Arthropoda Philippines |
  300 Iniopteryx I. rushlaui Nape wing
†Iniopteryx, †Iniopterygiformes, Chondrichthyes N America |
  300 - 295 5 Eryops E. megacephalus, †Eryops, †Eryoptidae, †Temnospondyli, "Drawn-out face" N America |
300 Arches Nat. Park seas periodically covered area. arches, fins, & other rock shapes
salt beds <1,524m/5,000' |
| 300 Garden of 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
1,000s feet 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 Karoo Supergroup S Africa & 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 |
Asselian Age
298.9 - 295 3.9
  299 - 279.5 19.5 Platyhystrix rugosus "Flat porcupine", †Platyhystrix, †Dissorophidae, †Temnospondyli
1Sp 1911 N America |
  299 - 253 46 Archegosaurus decheni "Beginning lizard" †Archegosaurus, †Archegosauridae, †Temnospondyli, 2Sp Germany |
| 299 - 0 Cycads seed plants long fossil history formerly more abundant & diverse |
| mi 299 - 296.4 2.6 Datheosaurus |
  298.9 - 272.95 26.15 Casea broilii Cheese
USA & France |
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Sakmarian Age
295 - 290.1 4.9
  295 - 272 23 Dimetrodon 2 measures of teeth D. limbatus N Am & Germany
†Dimetrodon
†Sphenacodontinae
†Sphenacodontidae
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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 Delaware Sea S New Mexico, Trans-Pecos Texas |
  290 Helicoprion bessosnowi Spiral saw
Oceans worldwide |
  290 Gerobatrachus hottoni Elder frog Texas N America |
290 - 272 18   Diadectes & Trimerorhachis N America |
 _ stick insect, mantis, cicada 🦗/20 Brazilian treehopper Bocydium globulare Worldwide 289.9 - Present.png) 289.9 - 0 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 |
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Kungurian Age
283.5 - 272.3 11.2
| 275 Nikkasaurus N. tataronoovi, †Nikkasaurus, †Nikkasauridae, †Biarmosuchia, Therapsida genus therapsids. insectivors |
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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 & 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
Cisuralian Epoch
298.9 - 272.95 26.6
Kungurian Age
283.5 - 272.3 11.2
 275 Tetraceratops insignis 4-horned face emblem †Tetraceratops, Sphenacodontia, 1908 Texas |
  274 - 271 3 Cacops aspidephorus "blind face" †Cacops, †Eucacopinae, †Dissorophidae, †Temnospondyli, 3Sp N America |
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Guadalupian Age
272.95 - 259.8 12.5
Roadian Stage
272.95 - 268.8 4.15
272 - 251 21 Aelurosaurus small, carnivorous therapsids
Karoo Basin, S Africa. |
270.6 - 252 18.6 Gorgonopsi suborder quadrupedal predators prominent canines
apex predators Russia & Africa |
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270.6 - 251 19.4 Lycaenops ornatus "wolf-face" 
