The Ordovician (/ɔːrdəˈvɪʃi.ən, -doʊ-, -ˈvɪʃən/ or-də-VISH-ee-ən, -⁠doh-, -⁠VISH-ən) is a geologic period and system, the second of six periods of the...

Cap Late D O–S The Late Ordovician mass extinction (LOME), sometimes known as the end-Ordovician mass extinction or the Ordovician-Silurian extinction, is...

The Early Ordovician is the first epoch of the Ordovician period, corresponding to the Lower Ordovician series of the Ordovician system. It began after...

The Late Ordovician, also called the Upper Ordovician by geologists, is the third and final epoch of the Ordovician period. At this time, Western and Central...

K–Pg Tr–J P–Tr Cap Late D O–S The Cambrian–Ordovician extinction event, also known as the Cambrian-Ordovician boundary event, was an extinction event that...

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...

subdivided into six geologic periods (from oldest to youngest), Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian. Some geological timescales...

appearing in the Ordovician include: Cyclopyge (Early to Late Ordovician) Selenopeltis (Early to Late Ordovician) Parabolina (Early Ordovician) Cheirurus (Middle...

The Great Ordovician Biodiversification Event (GOBE), was an evolutionary radiation of animal life throughout the Ordovician period, 40 million years after...

The Ordovician meteor event was a dramatic increase in the rate at which L chondrite meteorites fell to Earth during the Middle Ordovician period, about...

Ice Age (EPIA), the Early Paleozoic Icehouse, the Late Ordovician glaciation, or the end-Ordovician glaciation, occurred during the Paleozoic from approximately...

Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovician Period 485.4 Ma. Most of the continents lay in the southern hemisphere...

(Ordovician) Chlamydosphaeridia (Ordovician) Comasphaeridium (Ordovician) Coronitesta (Ordovician) Coryphidium (Ordovician) Costatilobus (Ordovician)...

[citation needed] As such, it's not until the Ordovician that the first crown-group members arise. By the Ordovician period the gastropods were a varied group...

point been present around Earth during the Ordovician period. These rings may have formed during the Ordovician impact spike approximately 466 million years...

into the super-continent Gondwana. The Ordovician spans from 485 million to 444 million years ago. The Ordovician was a time in Earth's history in which...

and extending southwest to Longford and south to Navan is a province of Ordovician and Silurian rocks, with similarities to the Southern Uplands province...

Sacabambaspis is an extinct genus of jawless fish that lived in the Ordovician period. Sacabambaspis lived in shallow waters on the continental margins...

; Owen, A. W. (2002), Palaeobiogeography and Biodiversity Change: The Ordovician and Mesozoic–Cenozoic Radiations, Geological Society Special Publication...

the Mexican amber by García-Villafuerte (2018). Redescription of the Ordovician malacostracan Wuningia multisegmenlata is published by Lin (2018). A member...

Europe. The Caledonian orogeny encompasses events that occurred from the Ordovician to Early Devonian, roughly 490–390 million years ago (Ma). It was caused...

Orthoceras is a genus of extinct nautiloid cephalopod restricted to Middle Ordovician-aged marine limestones of the Baltic States and Sweden. This genus is...

(Silurian or younger). It was formed in a marine environment in the Late Ordovician period. The meteorite is estimated between 50 and 90 million tons and...

Iapetus Ocean and Khanty Ocean. The Ordovician period started at a major extinction event called the Cambrian–Ordovician extinction event some time about...

coast Ordovician genus, in prior times it was employed as a general name given to all straight-shelled nautiloids that lived from the Ordovician to the...

Representatives of this genus have been found in the Upper Ordovician of the Czech Republic. Biogeography of Ordovician bryozoans. Michael E Tuckey, Palaeogeography...

malacology known as teuthology. Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two...

in the Middle Ordovician period. If rocks of unknown age are found to have traces of E. pseudoplanus, they must have a mid-Ordovician age. Such index...

(Ordovician) Actinotrypidae (Carboniferous-Permian) Anolotichiidae (Ordovician) Botrylloporidae (Ordovician-Devonian) Ceramoporidae (Ordovician-Devonian)...

to the present. They diversified profusely in the Ordovician, and are most common in the Ordovician, Silurian and Devonian marine deposits of the Paleozoic...