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| image_caption = ''[[Vinlandostrophia ponderosa]]'' (Upper Ordovician). ...ared during the [[Early Cambrian]] period and became very diverse by the [[Ordovician]], living in shallow-shelf seas. Orthids are the oldest member of the subp ...

| fossil_range = [[Early Ordovician]]<br>{{Fossil range|480|470}} ...t was not determined that they were the oldest known vertebrates until the late 1960s. ''Arandaspis'' is named after a local [[Indigenous Australians|Indig ...

| fossil_range = [[Late Ordovician]], {{Fossil range|450}} ...naspis splendens, new genus, new species, a new ostracoderm from the Upper Ordovician of North America. Proceedings of the United States National Museum 108(3391 ...

| fossil_range = [[Early Ordovician]] – [[Late Ordovician]], {{fossil range|480|455}} ....jpg|thumb|left|''[[Sacabambaspis]]'', the best known arandaspid, from the Ordovician of Bolivia. shows the characteristic, frontally positioned eyes, like car h ...

...'''Cambrian–Ordovician extinction event''', also known as the '''Cambrian-Ordovician boundary event''',<ref name="RichardAlanFortey" /> was an [[extinction even ...the [[Cambrian]] [[geologic period|period]], and led into the subsequent [[Ordovician]] period. It eliminated many [[brachiopods]] and [[conodont]]s, and severel ...

| image_caption = Receptaculitid from the [[Ordovician]] of [[Estonia]]. ...ll continents except Antarctica.<ref>Rietschel, S. and Nitecki, M.H. 1984. Ordovician Receptaculitid algae from Burma. Palaeontology, vol. 27, p. 415-420.</ref>< ...

| fossil_range = {{fossil_range|Cambrian Stage 3|Late Ordovician}} ...half of the Lower [[Cambrian]], and the last species did not survive the [[Ordovician–Silurian extinction event]]. ...

| fossil_range = {{fossil range|Middle Ordovician|Permian|[[Ordovician]]–[[Permian]]}} ...ry rugose coral [[Grewingkia|''Grewingkia canadensis'']] in three views; [[Ordovician]], [[Indiana]] ...

...07.02.006| first1 = J.| volume = 40| title = 'Cambrian' demosponges in the Ordovician of Morocco: Insights into the early evolutionary history of sponges| journa [[Category:Silurian extinctions]] ...

| fossil_range = {{fossil range|480|359|[[Early Ordovician]] to [[Late Devonian]]}} [[Category:Early Ordovician first appearances]] ...

...lution and paleogeography of Eospirifer (Spiriferida, Brachiopoda) in Late Ordovician and Silurian |journal=Science China Earth Sciences |date=September 2012 |vo [[Category:Early Devonian genus extinctions]] ...

...497|359|ref=<ref name=HarperServais>{{cite book|chapter= 20. A synopsis of Ordovician trilobite distribution and diversity|author= J.M. Adrain|title= Early Palae ...] of [[trilobite|trilobites]] that lived from the Late [[Cambrian]] to the Late [[Devonian]]. It is made up of a morphologically diverse assemblage of taxa ...

...tinct]] [[mollusc]]s dating from the early [[Cambrian]] to the [[Lopingian|Late Permian]]. They were initially thought to be [[bivalve]]s, but were later g ..., heavily competing with the bivalves until their decline in the end-early Ordovician turnover. ...

...mily]] of [[Phacopida|phacopid]] [[trilobite]]s that ranges from the Lower Ordovician to the Upper Devonian, with representatives in all [[Supercontinents|paleoc ...rinella]]''.<ref name=HarperServais>{{cite book|chapter= 20. A synopsis of Ordovician trilobite distribution and diversity|author= J.M. Adrian|title= Early Palae ...

| fossil_range = {{fossil range | Early Ordovician | Late Devonian | ref=<ref name="Traverse2007">{{Cite book | last1 = Traverse | fi ...naceous 'linings'.<ref>Wood, G.D., Miller, M.A., and Bergstrom, S.M. 2004. Late Devonian (Frasnian) tentaculite organic remains in palynological preparatio ...

...on|Sampling bias in the fossil record raising difficulties to characterize extinctions}} [[File:Signor-lipps.svg|thumb|300px|The Signor–Lipps effect can make extinctions appear more extended in time than they actually are.]] ...

...[chronostratigraphic]] stages within the [[Ludlow Series]]. Its age is the late [[Silurian]] [[geologic period|Period]], and within both the [[Palaeozoic]] ...trophic end-Ordovician and end-Permian mass extinctions.<ref>M. Calner, "A Late Silurian extinction event and anachronistic period" ''Geology'' 33, pp. 305 ...

| fossil_range = {{fossil range|Lower Ordovician|Upper Triassic|latest=Early Cretaceous}} ...63|url-access=subscription }}</ref> They were most common however from the Ordovician to the [[Devonian]]. ...

| fossil_range = {{fossil_range|Cambrian Stage 3 |Late Ordovician}} ...vician]] transition, and the last agnostidans went [[extinct]] in the Late Ordovician.<ref>{{cite journal | vauthors = Barnes BD, Sclafani JA, Zaffos A | title = ...

...ites appear in the Upper [[Cambrian]], and the last species die out in the late [[Devonian]] period.<ref name="Mcnamaraetal2009"></ref> [[File:Entomaspis radiata.JPG|thumb|Life reconstruction of the Late Cambrian harpetid trilobite, ''[[Entomaspis]] radiata'', from [[Utah]] ]] ...