Tetragraptus is an extinct genus of graptolites from the Ordovician period. T. akzharensis T. approximatus T. fruticosus T. insuetus Fossils of Tetragraptus...

Tetragraptus approximatus is a species of dichograptid graptolite belonging to the genus Tetragraptus. It existed during the Floian Age (477.7 million...

was decided to divide each of the three series into two global stages. Tetragraptus approximatus zone was chosen as the base of the upper stage of the Lower...

proliferum Prolecanites gurleyi Palmatolepus unicornis Hexamocaras hertzeri Tetragraptus fructicosus Billingsella corrugata Paleontology seeks to map out how...

Devonian 416 to 359 million years ago Palmatolepis unicornis Devonian Tetragraptus fructicosus Ordovician Paradoxides Cambrian 509 to 500 million years...

larger part of the north of the island is formed from mudstones of the Tetragraptus Mudstone Formation (also known as the 'Penmaen Dewi Shale Formation'...

boundary is defined as the first appearance of the graptolite species Tetragraptus approximatus. The base of this stage was ratified by the International...

†Pseudophyllograptus Cooper & Fortey, 1982 †Pseudotrigonograptus Mu & Lee, 1958 †Tetragraptus Salter, 1863 †Tristichograptus Jackson & Bulman, 1970 Maletz, Jörg (2017)...

type locality for species †Tetracamera †Tetragraptus †Tetragraptus amii †Tetragraptus pseudobigsbyi †Tetragraptus quadribrachiatus †Tetralobula – tentative...

beginning of the Floian which is defined as the first appearance of Tetragraptus approximatus at the GSSP in Diabasbrottet quarry, Västergötland, Sweden...

The lower boundary of the Floian is defined as the first appearance of Tetragraptus approximatus, a graptolite species. The rock section belongs to the Tøyen...

manus D. spinosus Glossograptus G. echinatus G. horridus Phyllograptus Tetragraptus Paleontology portal List of fossiliferous stratigraphic units in Arkansas...

Rotaciurcidae within Cephalodiscida. The type species is R. superbus. Tetragraptus gerhardi Sp. nov Valid Maletz Ordovician  Sweden A graptolite belonging...

tennenbaumi Obenberger, 1934 Taphrocerus tenuis (Kirsch, 1873) Taphrocerus tetragraptus Obenberger, 1941 Taphrocerus theryi Obenberger, 1924 Taphrocerus tigrensis...

Dinorthis obispoensis Orthambonites calligramma Peelerophon oehlerti Tetragraptus quadribrachiatus Thysanopyge argentina Yutagraptus vdeflexus Phyllograptus...

multiramous dichograptid, also sometimes classified as Holograptus. “Tetragraptus” "T. bulmani" Araneograptus murrayi zone A common tetragraptid graptoloid...

Diabasbrottet quarry, Västergötland, Sweden Biologic: Lowest appearance of Tetragraptus approximatus (Graptolite). 58°21′32″N 12°30′09″E / 58.3589°N 12.5024°E...

Glossograptus G. hystrix Mesograptus Phyllograptus P. typus Retiograptus Tetragraptus T. clarkei T. fruticosus T. quadribrachiatus T. pendens T. serra T. similis...

deflexus, B. minutus Pircanchaspis rinconensis Pseudophyllograptus densus Tetragraptus cf. amii Didymograptus cf. suecicus Basilicus sp. Dinorthis sp. Famatinolithus...

quarry as the lowest stratigraphic occurrence of the graptolite species Tetragraptus approximatus. "GSSP Table - Paleozoic Era". Geologic TimeScale Foundation...

†Strophomena †Syringopora †Taeniocrada †Teganium †Tentaculites †Tetradium †Tetragraptus †Triarthrus †Uraloceras †Uraloceras burtiense †Uraloceras fedorowi †Uraloceras...

3/4, 189–192. Kraft J., Kraft P. (1994): The Azygograptus ellesi – Tetragraptus (reclinatus group) Biozone (Klabava Formation, Ordovician of the Prague...

†Spirifer †Spirifer brazerianus †Spiriferina †Strophomena †Syringopora †Tetragraptus †Tetrataxis †Thoracocare †Urotheca †Wilkingia †Worthenia – tentative...

type locality for species †Testispongia †Testispongia venula †Tetragraptus †Tetragraptus quadribrachiatus – or unidentified comparable form †Thalassinoides...

†Stigmaria †Syringopora †Teichichnus – tentative report †Terranovella †Tetragraptus †Thalassinoides – tentative report †Tricrepicephalus †Trigonocercella...

†Stylonema – tentative report †Subulites †Syringopora †Tentaculites †Tetragraptus †Tetrataxis †Thoracocare †Triarthrus †Trinodus †Trocholites †Tuzoia †Tylonautilus...

†Temnophyllum waltheri – type locality for species †Tentaculites †Tetragraptus †Tetragraptus bigsbyi †Tetraprioniodus – tentative report †Tetraprioniodus costatus...

†Tersella sainsburyi – type locality for species †Tetradium †Tetragraptus †Tetragraptus quadribrachiatus – or unidentified comparable form †Tetraprioniodus...

Late Ordovician Middle Ordovician Caño Cristales Meta Dichograptus sp., Tetragraptus sp., ?Lingulella sp., ?Obolus sp. Darriwilian El Higado Fm. Venado Fm...