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
300Arches 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.
300Garden of the Gods 3,318ac/13.43km2 Shawnee National Forest, Illinois.
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
Eosimops genus of pylaecephaliddicynodonts. They were small synapsids superficially resembling modern mammals. known from several skull specimens, as well as one complete skeleton. S Africa.
300 - 0 Inshore hagfish, Eptatretus burgeri, Eptatretus, Myxinidae, Myxiniformes, Myxini, 5Sp 
300 Etacystis, Etacystis communir, Etacystis, Pterobranchia?, Hemi?, Eumetazoa 1976 
300 - 280 20 Sphenacodon ferox, Sphenacodon, Sphenacodontinae, Sphenacodontidae, . "Wedge point tooth" 3Sp 1878  _ ant, bee, beetle 🐞/22 Trachelismus tenuissimus Philippines Present .png){kind=small}
 _ ant, bee, beetle 🐞/22 Trachelismus tenuissimus Philippines 300 - Present .png){kind=small}
300 - 0 Trachelismus tenuissimus, Trachelismus, Trachelipodidae, Oniscidea, Isopoda, Malacostraca, Crustaca, Arthropoda 
300 Iniopteryx I. rushlaui, †Iniopteryx, †Iniopterygiformes, Chondrichthyes, "Nape wing" 
300 - 295 5 Eryops E. megacephalus, †Eryops, †Eryoptidae, †Temnospondyli, "Drawn-out face" 
300 - 280 20 Edaphosaurus poganias Pavement lizard Edaphosaurus, Edaphosauridae, Sphenacomorpha, Haptodontiformes, Eupelycosauria, Synapsida, Amniota, Rpetiliomorpha, Tetrapoda, 
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, 
298.9 - 272.95 25.95 Discosauriscus pulcherrimus, †Discosauriscus, †Discosauriscidae, †Seymouriamorpha, 2Sp 1879 
299 - 251 48 Diplocaulus "Double caul" †D. magnicornis, †Diplocaulus, †Diplocaulidae, †Nectridea, †Lepospondyli, 5Sp Morocco 
299 - 279.5 19.5 Platyhystrix rugosus "Flat porcupine", †Platyhystrix, †Dissorophidae, †Temnospondyli, 1Sp 1911 
299 - 253 46 Archegosaurus decheni "Beginning lizard" †Archegosaurus, †Archegosauridae, †Temnospondyli, 2Sp 
298.9 - 272.95 26.15 Casea broilii Cheese USA & France
295 - 272 23 Dimetrodon "Two measures of teeth" D. limbatus, †Dimetrodon, †Sphenacodontinae, †Sphenacodontidae, 
290 Helicoprion bessosnowi Spiral saw 
290 Gerobatrachus hottoni Elder frog 
Diadectes _ stick insect, mantis, cicada 🦗/20 Brazilian treehopper Bocydium globulare Worldwide 289.9 - Present.png){kind=small}
289.9 - Present Bocydium globulare, Bocydium, Membracidae, Hemiptera, Insecta, Arthropoda 1803 Worldwide Brazilian treehopper
285 - 272.3 12.7 Secodontosaurus obtusidens Cutting-tooth lizard Texas USA Early Permian 
280 - 270 10 Seymouria baylorensis Baylor Country N America and Europe Early Permian
279.5 - 272 7.5 Cotylorhynchus romeri, †Cotylorhynchus, †Caseidae, †Caseasauria, 3Sp 1937 
274 - 271 3 Cacops aspidephorus "blind face" †Cacops, †Eucacopinae, †Dissorophidae, †Temnospondyli, 3Sp N America 
270.6-251 Lycaenops ornatus "wolf-face" 
