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...
- 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...
- Tetragraptus approximatus is a species of dichograptid graptolite belonging to the genus Tetragraptus. It existed during the Floian Age (477.1 million...
- boundary is defined as the first appearance of the graptolite species Tetragraptus approximatus. The base of this stage was ratified by the International...
- 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'...
- Mucrospirifer mucronatus Devonian 416–359 Palmatolepis unicornis Devonian Tetragraptus fructicosus Ordovician Paradoxides Cambrian 509–500 Billingsella corrugata...
- †Sinograptus rastritoides †Tetragraptus Cf. †Tetragraptus (Tetragraptus) bigsbyi Cf. †Tetragraptus minutus †Tetragraptus pendens †Tetragraptus pendens liber - type...
- quarry as the lowest stratigraphic occurrence of the graptolite species Tetragraptus approximatus. "GSSP Table - Paleozoic Era". Geologic TimeScale Foundation...
- 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...
- type locality for species †Tetracamera †Tetragraptus †Tetragraptus amii †Tetragraptus pseudobigsbyi †Tetragraptus quadribrachiatus †Tetralobula – tentative...