Definition of Tetragraptus. Meaning of Tetragraptus. Synonyms of Tetragraptus

Here you will find one or more explanations in English for the word Tetragraptus. Also in the bottom left of the page several parts of wikipedia pages related to the word Tetragraptus and, of course, Tetragraptus synonyms and on the right images related to the word Tetragraptus.

Definition of Tetragraptus

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Meaning of Tetragraptus from wikipedia

- 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 s****s to map out how...
- 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'...
- Devonian 416 to 359 million years ago Palmatolepis unicornis Devonian Tetragraptus fructicosus Ordovician Paradoxides Cambrian 509 to 500 million years...
- †Pseudophyllograptus Cooper & Fortey, 1982 †Pseudotrigonograptus Mu & Lee, 1958 †Tetragraptus Salter, 1863 †Tristichograptus Jackson & Bulman, 1970 Maletz, Jörg (2017)...
- boundary is defined as the first appearance of the graptolite species Tetragraptus approximatus. The base of this stage was ratified by the International...
- Rotaciurcidae within Cephalodiscida. The type species is R. superbus. Tetragraptus gerhardi Sp. nov Valid Maletz Ordovician  Sweden A graptolite belonging...
- 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...