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Early Ordovician life
- the International Geological Congress. Life continued to flourish during the Ordovician as it did in the earlier Cambrian period, although the end of the
- interval of 455 to 430 million years ago, lasting from the Middle Ordovician to Early Silurian, thus including the extinction period. This event was the
- Ordovician radiation, or the great Ordovician biodiversification event GOBE was an evolutionary radiation of animal life throughout the Ordovician
- The Late Ordovician Glaciation is the first part of the Andean - Saharan glaciation. It was centered on the Sahara region in late Ordovician about 440 460
- in sea level, killing off all life that had established along coastal Gondwana. Glaciation may have caused the Ordovician Silurian extinction events, in
- jaws, such as the acanthodians, first appeared in the Late Ordovician Adaptation to life on land is a major challenge: all land organisms need to avoid
- Early Ordovician conodont distribution from craton to basin and island terranes in East Gondwana 9th International Symposium on the Ordovician System
- Middle Ordovician Reudemannoceratidae and from there diverges into three main lineages. Questionable discosorids have been reported as early as the Middle
- group of extinct marine arthropods, which lived during the Ordovician Tremadocian to early Hirnantian in what are now the Yukon Territories, Virginia
- Endocerida comprises a diverse group of cephalopods that lived from the Early Ordovician possibly to the Late Silurian. Their shells varied in form. Some were
- during the Ordovician The Ordovician carbonate rocks deposited in that environment are now world - class sources of fossils. Ordovician algae were preserved
- Furongian or early Ordovician Tremadocian of the Santa Rosita Formation in Argentina. Conodonts from the Prairie du Chien Lower Ordovician beds of the
- end of the Ordovician eliminated most graptolites except the neograptines. Diversification from the neograptines that survived the Ordovician glaciation
- Hirnantian is the seventh and final internationally recognized stage of the Ordovician Period of the Paleozoic Era. It was of short duration, lasting about 1
- group of extinct armored jawless vertebrates, which lived in the Middle Ordovician about 450 million years ago in North America. They are placed among
- snails, mud - dwelling marine gastropod mollusks known from the early - middle Ordovician apparently allied with the Caenogastropoda. Stanley, Jnr., George
- Orthoceratoid cephalopods also known as the Michelinocerda that lived from the Early Ordovician 490 million years ago possibly to the Late Triassic 240 million
- extinct genus of conodonts. The Whiterock Stage refers mainly to the early Middle Ordovician in North America. It is often used in the older literature in a
- Eocrinoids and paracrinoids of the Baltic Ordovician basin: a biogeographical report. IGCP Meeting, Ordovician palaeogeography and palaeoclimate, Copenhagen
- cephalopods whose fossils ranged from the late Whiterockian Stage in the early Middle Ordovician through the remainder of the period and on into the Upper Silurian
- is a genus of very small agnostid trilobites whose fossils are found Ordovician - aged marine strata from Eurasia, North America and Argentina. balanolobus
- geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago Mya to the beginning of the Devonian
- during the late Ordovician and the Silurian period. For the Ordovician Saharan part, see the more extensive article on the Late Ordovician glaciation. According
- Canadian Epoch and take a tumble following the early Cincinnatian Sandbian in the early Late Ordovician from which the group never recovers. It is thought
- family Phyllograptidae. Fossils of this genus have been found in the Early Ordovician 475 - 473 million years ago in the sediments of Australia, Bolivia
- E. 2008 Onset of the Ordovician cephalopod radiation evidence from the Rochdale Formation middle Early Ordovician Stairsian in eastern New
- with a widespread distribution that lived during the Late Cambrian and Ordovician The Ellesmerocerida are characterized by shells that are typically small
- Ediacaran Period 541 million years ago mya to the beginning of the Ordovician Period 485.4 mya. Its subdivisions, and its base, are somewhat in flux
- which formed longer tentacles. Michelinoceras ranges from late in the Early Ordovician to the Devonian with more poorly known species from the Carboniferous
- generally small nautiloid cephalopods known from the Middle Ordovician to the Mississippian early Carboniferous in which the connecting rings are thin and