Or·do·vi·cian

(ôr′də-vĭsh′ən)

adj.

Of, relating to, or being the period of geologic time from about 488 to 444 million years ago, the second period of the Paleozoic Era. It is characterized by a major increase in marine biodiversity and the appearance of the supercontinent Gondwana. Some evidence suggests that the first land plants appeared at this time. See Table at geologic time.

The Ordovician Period.

[From Latin Ordovicēs, an ancient Celtic tribe of Wales, from Celtic Ordovices; see weik- in Indo-European roots.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Ordovician

(ˌɔːdəʊˈvɪʃɪən)

adj

(Geological Science) of, denoting, or formed in the second period of the Palaeozoic era, between the Cambrian and Silurian periods, which lasted for 45 000 000 years during which marine invertebrates flourished

(Geological Science) the Ordovician the Ordovician period or rock system

[C19: from Latin Ordovices ancient Celtic tribe in N Wales]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

Or•do•vi•cian

(ˌɔr dəˈvɪʃ ən)

adj.

1. noting or pertaining to a geologic period of the Paleozoic Era, from 500 million to 425 million years ago, notable for the advent of fish.

2. the Ordovician Period or System.

[1879; after the Ordovices (pl.) (< Latin) an ancient British tribe in N Wales]

Or·do·vi·cian

(ôr′də-vĭsh′ən)

The second period of the Paleozoic Era, from about 505 to 438 million years ago, characterized by the appearance of primitive fishes. See Chart at geologic time.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

Ordovician - from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds

Ordovician period

Paleozoic, Paleozoic era - from 544 million to about 230 million years ago

Translations

ordovicense ordovícico

Ordovicien

ordovicium

ордовик

Ordovician

[ˌɔːdəʊˈvɪʃɪən] ADJ → ordoviciense

Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

Mentioned in

References in periodicals archive

We studied the genesis of a single shallow-water siliciclastic bed, also called the Volkhov Oil Collector (Yakovleva 1977), in the tectonically stable Ordovician Baltoscandian palaeobasin.

A siliciclastic shallow-marine turbidite on the carbonate shelf of the Ordovician Baltoscandian palaeobasin/Terrigeenne madalmere turbidiit Ordoviitsiumi Baltoskandia paleobasseini karbonaatsel selfil

This study offers significant implications towards the features associated to the sedimentation pattern in the shallow skeleton-deficient sea during Furongian before the metazoan radiation of the Middle Ordovician.

CALCIFIED CYANOBACTERIA FOSSILS FROM THE MICROBIALITIC BIOHERMS IN CAMBRIAN SERIES 3 AND FURONGIAN OF SHANXI PROVINCE, NORTH CHINA PLATFORM

The first new batch of 2018 photographs taken Curiosity Lens Imager (MAHLI) could be similar to Ordovician trace fossils.

NASA Rover's images similar to trace fossils on Mars: Scientists

This paper focuses on a relatively quiet interval from Late Ordovician (Ashgill) to Late Silurian times when an enormous volume of sediment eroded from post-Middle Ordovician highlands was deposited in extensive basins on the Ganderian composite plate.

Provenance and paleogeography of post-Middle Ordovician, pre-Devonian sedimentary basins on the Gander composite terrane, eastern and east-central Maine: implications for Silurian tectonics in the northern Appalachians

For the Tahe Oilfield, the current main oil-gas production layer is the Middle Ordovician Yijianfang Formation and the Early Middle Ordovician Ying-shan Formation, and considerable previous works have been done on these layers [12-17].

Multiphase Calcite Cementation and Fluids Evolution of a Deeply Buried Carbonate Reservoir in the Upper Ordovician Lianglitag Formation, Tahe Oilfield, Tarim Basin, NW China

A UNESCO map for Yemen in 1985 showed them as Ordovician.

YEMEN - The North-Western Sector

Nevertheless, a series of Ordovician marine carbonatite oil and gas fields has been discovered in the northern and central paleohigh areas of the Tarim Basin (Kang, 2007; Zhou, 2010).

Geochemical characteristics and paleoenvironmental significance of the Ordovician paleokarst reservoir in the Maigaiti slope of Tarim Basin

Ordovician Trilobites of Southern Ontario, Canada and the Surrounding Region

This area was a southernmost part of Gondwana and was situated near the South Pole during the Early Ordovician (e.g., Cocks and Torsvik, 2002).

Lower/Middle Ordovician (Arenigian) shallow-marine trace fossils of the Pochico Formation, southern Spain: palaeoenvironmental and palaeogeographic implications at the Gondwanan and peri-Gondwanan realm

The term was coined in 1980 to indicate the system of carbonates and related shallow-water siliciclastics that were deposited on and around the Laurentian continent--the northern fragment as Pangaea broke up--during the Cambrian, Early Ordovician, and earliest Middle Ordovician nearly 500 million years ago.

The great American carbonate bank; the geology and economic resources of the Cambrian-Ordovician Sauk Megasequence of Laurentia