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1 The Ordovician Period
https://ucmp.berkeley.edu/ordovician/ordovician.php
From the Lower to Middle Ordovician, the Earth experienced a milder climate — the weather was warm and the atmosphere contained a lot of moisture. However, when ...
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2 Ordovician Period | Major Events, Extinction, & Facts
https://www.britannica.com/science/Ordovician-Period
Most Ordovician reefs were built on continental shelves or in shallow seas within the continental interior, although some were built at the edge of continental ...
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3 Environment of the Ordovician Period
http://members.wolfram.com/jeffb/Fossils/drift.shtml
During the Ordovician Period, the surface of the earth was dramatically different than it is today. Nearly all life on earth was in the oceans.
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4 Ordovician Period—485.4 to 443.8 MYA
https://www.nps.gov/articles/000/ordovician-period.htm
During the Ordovician, many new species replaced their Cambrian predecessors. In addition, primitive plants called lycophytes began to move onto ...
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5 Ordovician - Wikipedia
https://en.wikipedia.org/wiki/Ordovician
Invertebrates, namely molluscs and arthropods, dominated the oceans, with members of the latter group probably starting their establishment on land during this ...
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6 Ordovician Period | Natural History Museum
https://natmus.humboldt.edu/exhibits/life-through-time/visual-timeline/ordovician-period
Animals include, from left: Cystoids, jawless fish (Sacabambaspis) captured by a large cephalopod (Endoceras), Rugose corals, brachiopods, ...
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7 The Ordovician Period of the Paleozoic Era - Palaeos
http://palaeos.com/paleozoic/ordovician/ordovician.html
A major transgression in the Middle Ordovician created widespread shallow, warm epicontinental seas. Thus, most of the Ordovician was favorable for marine life, ...
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8 The Ordovician Period (488-443 Million Years Ago)
https://www.thoughtco.com/ordovician-period-488-443-million-years-1091428
Climate and Geography ... For most of the Ordovician period, global conditions were as stifling as during the preceding Cambrian; air temperatures ...
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9 Ordovician palaeogeography and climate change
https://www.sciencedirect.com/science/article/pii/S1342937X20302756
The Ordovician saw some of the most varied climates and sea level variations of the whole Phanerozoic (Fig. 3). At the beginning of the Ordovician the Earth was ...
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10 Ordovician
https://earth.usc.edu/~stott/Catalina/Ordovician.html
The Devonian is thought to have been quite warm. Evidence of this comes from the extensive amount of tropical-like reefs. The climate is also thought to have ...
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11 Ordovician Period: Facts, Information, and Timeline
https://a-z-animals.com/blog/ordovician-period-facts-information-and-timeline/
The Ordovician is the second period of that era. It follows the Cambrian Period, which ended about 485.4 million years ago and ended at the ...
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12 The Ordovician Period: The Rise of the Cephalopods
https://www.fossils-facts-and-finds.com/ordovician_period.html
During the first parts of the Ordovician the climate was fairly warm. The land uplifted and the continents moved around. When Gondwana stopped its movement over ...
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13 Ordovician Era 570 mya
http://personal.denison.edu/~hauk/bio380-2001/Ordovician.html
Climate/ecological communities ... Early in the Ordovician period, the climate was tropical and mildly warm, with an atmosphere containing an excess of moisture.Ý ...
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14 Ordovician - New World Encyclopedia
https://www.newworldencyclopedia.org/entry/Ordovician
The Ordovician atmosphere had about 70 percent as much oxygen and about 1500 percent as much carbon dioxide as today's atmosphere. The Ordovician, named after ...
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15 Ordovician period - Geology Page
https://www.geologypage.com/2014/03/ordovician-period.html
Climate and sea level. The Ordovician saw the highest sea levels of the Paleozoic, and the low relief of the continents led to many shelf ...
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16 Ordovician Period | Encyclopedia.com
https://www.encyclopedia.com/earth-and-environment/geology-and-oceanography/geology-and-oceanography/ordovician-period
Ordovician The second (510–439 Ma) of six periods that constitute the Palaeozoic Era, named after an ancient Celtic tribe, the Ordovices. The Ordovician follows ...
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17 Ordovician Period - Ohio History Central
https://ohiohistorycentral.org/w/Ordovician_Period
The Ordovician Period began about 488 million years ago and ended about 444 million years ago. These are the oldest rocks in the state that are exposed at ...
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18 Ordovician Period , Fossils of Kentucky by Geologic ...
https://www.uky.edu/KGS/fossils/fossil-region-ordovician-period.php
Common Ordovician fossils found in Kentucky include sponges (Porifera), corals (Cnidaria), bryozoans, brachiopods, trilobites, snails ( ...
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19 Relationship Found Between Ancient Climate Change and ...
https://beta.nsf.gov/news/relationship-found-between-ancient-climate-change
In the Late Ordovician Period of Earth's geologic history, about 450 million years ago, more than 75 percent of marine species perished and ...
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20 Deep Time-Ordovician Period. - PBS
https://www.pbs.org/wgbh/evolution/change/deeptime/ordovician.html
Without extinction, we might not have the variety of organisms we see today -- turtles, birds, worms, spiders. The late Ordovician extinction is indeed a ...
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21 Paleozoic Era: Facts & Information - Live Science
https://www.livescience.com/37584-paleozoic-era.html
Gondwana moved further south during the Ordovician, while the smaller continents started to move closer together. In the Silurian Period, the ...
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22 Ordovician - Energy Education
https://energyeducation.ca/encyclopedia/Ordovician
The Ordovician was the second geological period of the Paleozoic era, extending from approximately 485.4 million to 443.8 million years ago. It is divided into ...
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23 Plant Evolution & Paleobotany - Ordovician - Google Sites
https://sites.google.com/site/paleoplant/geologic/phanerozoic/paleozoic/ordovician
Age of the earliest land plants ... The Ordovician Period (485-444 Ma) is in the Paleozoic Era, occurring after the Cambrian Period and before the Silurian Period ...
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24 ordovician - The Virtual Fossil Museum
http://www.fossilmuseum.net/Paleobiology/paleobiology%20development/ordovician.htm
Green algae were common in the Ordovician and Late Cambrian (perhaps earlier). Plants probably evolved from green algae. The first terrestrial plants appeared ...
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25 The Complete History Of The Earth: Ordovician Era - YouTube
https://www.youtube.com/watch?v=QoIy1YNdhjE
Jun 24, 2022
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26 End-Ordovician Extinction - Sam Noble Museum
https://samnoblemuseum.ou.edu/understanding-extinction/mass-extinctions/end-ordovician-extinction/
All of the major animal groups of the Ordovician oceans survived, including trilobites, brachiopods, corals, crinoids and graptolites, but each lost important ...
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27 Ordovician - AWS
https://content-calpoly-edu.s3.amazonaws.com/evolution/1/images/5earth-and-geobiosphere/catastrophes/Ordovician%20-%20wiki.pdf
Climate and sea level. Life. Fauna. Flora. End of the period. References. External links. The Ordovician Period began with a major ...
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28 Life Through the Ages – UMORF - University of Michigan
https://umorf.ummp.lsa.umich.edu/wp/life-through-the-ages/
Many groups of marine organisms diversified in this period, increasing the number of species. The earliest evidence of land plants comes from the Ordovician ...
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29 Ordovician-Silurian Mass Extinction: Causes & Lost Species
https://study.com/academy/lesson/ordovician-silurian-mass-extinction-causes-evidence-species.html
The first stage occurred at the end of the Ordovician period and was likely due to climate change, specifically, a cooling of Earth's ...
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30 Geology Rocks - The Ordovician Period - Fun Kids
http://www.funkidslive.com/learn/geology-rocks/geology-rocks-ordovician-period/
At the end of the Ordovician Period, Gondwana suddenly stopped travelling over the South Pole, when glaciers formed, causing the temperature of the seas to drop ...
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31 Impact of Late Ordovician Glaciation-Deglaciation on Marine Life
https://www.ncbi.nlm.nih.gov/books/NBK231940/
Although many glaciations have occurred during the history of the Earth, the glaciation near the end of the Ordovician stands out because the environmental ...
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32 The End-Ordovician Mass Extinction Wiped Out 85 Percent of ...
https://www.discovermagazine.com/the-sciences/the-first-mass-extinction-event-explained-end-ordovician
During the Ordovician Period, around 485 to 444 million years ago, the diversity of marine life exploded. Trilobites and mollusks crawled on the ...
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33 Uncovering the Secrets Behind Earth's First Major Mass ...
https://thecollege.syr.edu/news-all/news-from-2021/uncovering-the-secrets-behind-earths-first-major-mass-extinction/
Ordovician Period Fossils · Close-up image of fossils from Anticosti Island. · These Brachiopod fossils date back to the time of the Late ...
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34 Nautiloids: Shelled Marauders of Indiana's Ordovician Seas
https://igws.indiana.edu/FossilsAndTime/nautiloids
At the end of the Ordovician, there was a dramatic extinction in which 100 families of marine invertebrate animals disappeared. This Ordovician extinction was ...
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35 What caused the Earth's first mass extinction?
https://cosmosmagazine.com/nature/evolution/what-caused-the-ordovician-mass-extinction/
Nearly 500 million years ago in the late Ordovician period, a mass extinction wiped out 85% of marine species. Scientists have now used ...
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36 Climate change and the selective signature of the Late ... - PNAS
https://www.pnas.org/doi/10.1073/pnas.1117039109
The Late Ordovician Mass Extinction (LOME) was the first of the “Big Five” Phanerozoic mass extinctions, and it eliminated an estimated 61% of ...
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37 A nutrient control on expanded anoxia and global cooling ...
https://www.nature.com/articles/s43247-022-00412-x
The late Ordovician also saw periods of intense volcanism, ... Data for δ13Corg, Corg, Ptot, climate change and redox conditions for the SH ...
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38 First plants cooled the Ordovician - geo.uni-bremen.de
https://www.geo.uni-bremen.de/~apau/dynamic_climate/CCYCLE/lenton_et_al_2012.pdf
The Late Ordovician period, ending 444 million years ago, was marked by the onset of glaciations. The expansion of non-vascular land plants accelerated chemical ...
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39 Plant invasion triggered ice ages | University of Oxford
https://www.ox.ac.uk/news/science-blog/plant-invasion-triggered-ice-ages
OSB: How did the climate change during this period? LD: Climate changed dramatically during the late Ordovician Period. It changed from a ...
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40 Mass extinction of the marine biota at the Ordovician-Silurian ...
https://link.springer.com/article/10.1134/S0001437014050014
The appearance and development of terrestrial plants and microphytoplankton, which consumed atmospheric carbon dioxide, thus, diminishing the ...
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41 Low solar levels during Ordovician Period - Skeptical Science
https://skepticalscience.com/print.php?r=97
Older scientific papers inferred very high CO2 levels in the Ordovician, generating a paradox of a cold climate during a time of high greenhouse gas levels. But ...
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42 Uncovering the secrets behind Earth's first major mass extinction
https://www.sciencedaily.com/releases/2021/11/211101141526.htm
To paint a picture of the oceanic ecosystem during the Ordovician Period, mass extinction expert Seth Finnegan, associate professor at UC ...
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43 Paleozoic | U.S. Geological Survey - USGS.gov
https://www.usgs.gov/youth-and-education-in-science/paleozoic
What did Earth look like during the Ordovician Period? ... Sources/Usage: Public Domain. Artist's rendition of marine life in the Orodovician Period. Marine life ...
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44 Trilobites - British Geological Survey
https://www.bgs.ac.uk/discovering-geology/fossils-and-geological-time/trilobites/
They appeared abruptly in the early part of the Cambrian Period and came to dominate the Cambrian and early Ordovician seas. A prolonged decline then set in ...
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45 An Overview of the Flora and Fauna During the Ordovician ...
https://sciencestruck.com/an-overview-of-flora-fauna-during-ordovician-period
Ordovician is the second period of the Paleozoic Era, and covered a time span of about 41.2 million years, from 485 million years ago to 443 million years ago.
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46 Ordovician-Silurian Mass Extinction | by William House
https://medium.com/earthsphere/ordovician-silurian-mass-extinction-15558f4c4fe2
The Ordovician Period was a great time for life on Earth until the Ordovician-Silurian mass extinction catastrophe.
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47 Ordovician Period - The Inquisitive Biologist
https://inquisitivebiologist.com/tag/ordovician-period/
In Explorers of Deep Time, Roy Plotnick, a palaeontologist and emeritus professor in earth and environmental sciences, challenges this and other stereotypes.
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48 Chapter 11 (The Later Ordovician)
https://uh.edu/~geos6g/1376/ordovician11.html
The Ordovician was a time when multiple feeding levels began to develop both above and below the sea floor. Brachiopods attached to the substrate fed on food ...
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49 The Late Ordovician Mass Extinction - Annual Reviews
https://www.annualreviews.org/doi/pdf/10.1146/annurev.earth.29.1.331
faunas of Ordovician aspect survived into the earliest Silurian Period (Baarli &. Harper 1986). Correlations based on shelly fossils from this interval are ...
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50 Historylines Ordovician Period
http://www.historylines.net/history/Geophysical/ordovician.html
For most of the Ordovician Period, however, temperatures were warm, and carbon dioxide (CO2) concentrations in the atmosphere were incredibly high (eight to ...
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51 Ordovician in Indiana map - The Paleontology Portal
http://paleoportal.org/index.php?globalnav=time_space§ionnav=state&state_id=51&period_id=15
The majority of the Ordovician rocks in Indiana are limestones and shales, which are exposed in the southeastern part of the state. These rocks contain abundant ...
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52 Ordovician period: characteristics, geology, climate, flora and ...
https://www.meteorologiaenred.com/en/ordovicico.html
During the Ordovician period the fauna was really abundant in the oceans. There was a great biodiversity from the smallest and most primitive to other somewhat ...
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53 Ordovician period - Infoplease
https://www.infoplease.com/encyclopedia/earth/geology-oceanography/info/ordovician-period
ôrdəvĭsh´ən [key] [from the Ordovices, ancient tribe of N Wales], second period of the Paleozoic era of geologic time (see Geologic Timescale, ...
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54 Rapid marine oxygen variability: Driver of the Late Ordovician ...
https://www.science.org/doi/10.1126/sciadv.abn8345
... severe mass extinction occurred at the end of the Ordovician period, ... biotic responses to rapid climate and environmental change.
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55 Ordovician Period Essay - 794 Words | Internet Public Library
https://www.ipl.org/essay/The-Paleozoic-Period-FJ6CQGX5ZNR
The Ordovician period is mostly known its various marine invertebrates. The climate during this period seemed to be mostly cold. At the time most of the lands ...
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56 Geochemical Records Reveal Protracted and Differential ...
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021AV000563
The Ordovician (Hirnantian; 445 Ma) hosts the second most severe mass extinction in Earth history, coinciding with Gondwanan glaciation and ...
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57 Large trilobites in a stress-free Early Ordovician environment
https://www.cambridge.org/core/journals/geological-magazine/article/large-trilobites-in-a-stressfree-early-ordovician-environment/DBF7C9E9D57547EE85E27B66A67DB974
by F Saleh · 2021 · Cited by 8 —
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58 Global changes during the Ordovician period. Appearances of...
https://www.researchgate.net/figure/Global-changes-during-the-Ordovician-period-Appearances-of-non-vascular18-and-vascular23_fig1_220023048
Appearances of non-vascular18 and vascular23 plants dot the timeline of climate change as recorded by conodont δ18O values1 (diamonds, left-hand scale). The ...
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59 The Ordovician Period - about 505-446 Ma - Austhrutime
https://austhrutime.com/ordovician.htm
The climate appears to have been hot in the Early Ordovician, cooler in the Middle Ordovician, hot again in the Late Ordovician, but cool again ...
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60 MICHILOGIC TIME LINE - State of Michigan
https://www.michigan.gov/-/media/Project/Websites/egle/Documents/Programs/OGMD/Catalog/03/GIMDL-CMG94.pdf?rev=7f7f4f988b8f4313825ccbeedd9807cd
Department of Environmental Quality, Geological Survey Division. ... During the Ordovician Period, 70 percent of the North American.
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61 New clues about Earth's earliest major mass extinction • Earth ...
https://www.earth.com/news/new-clues-about-earths-earliest-major-mass-extinction/
Professor Seth Finnegan, an expert in mass extinction at UC Berkeley, said the seas were full of biodiversity during the Ordovician Period.
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62 The Ordovician diorama | Redpath Museum - McGill University
https://www.mcgill.ca/redpath/article/ordovician-diorama
The Ordovician period lasted almost fifty million years, from 488 through to 443 million years ago. It is the second period in the Paleozoic ...
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63 Paleozoic Era (541 million years ago to 252 ... - GeoKansas
https://geokansas.ku.edu/paleozoic-era-541-million-years-ago-to-252-million-years-ago
During the Paleozoic Era, which lasted 289 million years, plants and reptiles ... into six periods: Permian, Carboniferous, Devonian, Silurian, Ordovician, ...
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64 Oxygenation as a driver of the Great Ordovician ...
http://www.biodiversitycenter.org/files/seminars/15/Oxygenation%20as%20a%20driver%20of%20the%20Great%20Ordovician%20Biodiversification%20Event.pdf
Period about 450 million years ago. A leading hypothesis for this Great Ordovician Biodiversification Event is that cooling of the. Ordovician climate ...
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65 Oxygen levels link to ancient explosion of life, researchers find
https://source.wustl.edu/2017/11/oxygen-levels-link-ancient-explosion-life-researchers-find/
They cite a nearly 80-percent increase in oxygen levels where oxygen constituted about 14 percent of the atmosphere during the Darriwilian Stage ...
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66 Ordovician - Fossil Wiki | Fandom
https://fossil.fandom.com/wiki/Ordovician
The Ordovician is a geologic period and system, the second of six of the Paleozoic era, and covers the time between 488.3±1.7 to 443.7±1.5 million years ago ...
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67 The Ordovician Extinction: Life & Causes - SchoolWorkHelper
https://schoolworkhelper.net/ordovician-extinction-life-causes/
Organisms found in the Ordovician period were exclusively aquatic organisms. A small exception to this may have been extremely primitive non-vascular plants ...
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68 The first mass extinction - Geobites
https://geobites.org/the-first-mass-extinction/
In the late Ordovician period (~445 Myrs ago), geologists identified the oldest and second largest known mass extinction event where 85% of ...
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69 The End-Ordovician Extinction: 444 Million Years Ago
https://www.coursera.org/lecture/extinctions-past-present-and-future/the-end-ordovician-extinction-444-million-years-ago-yYL8E
For example, the end of the Paleozoic Era and beginning of the Mesozoic Era is marked by the largest mass extinction of the Phanerozoic at the ...
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70 First land plants plunged Earth into ice age | New Scientist
https://www.newscientist.com/article/dn21417-first-land-plants-plunged-earth-into-ice-age/
The first land plants appeared around 470 million years ago, during the Ordovician period, when life was diversifying rapidly.
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71 Palaeozoic landscapes shaped by plant evolution
https://wpg.forestry.oregonstate.edu/sites/wpg/files/seminars/2012_Gibling.pdf
Embryophytes (land plants) first appeared by the Middle. Ordovician period, on the basis of discoveries of palynomorphs.
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72 Ordovician Time Period | Sutori
https://www.sutori.com/story/ordovician-time-period--YvTELKYCf3fQKgnBRhvnAfGe
The Ordovician period took place 488mya and lasted for 44 million years before the Silurian period began. The Ordovician period is best known for its aquatic ...
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73 Ordovician Introduction - The Virtual Petrified Wood Museum
http://petrifiedwoodmuseum.org/OrdovicianIntroduction.htm
The Ordovician period was named for the Ordovices, a Celtic tribe living in Wales during the Roman conquest. The Ordovician period extends from 488.3 million ...
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74 Ordovician Period - Peripatus
http://www.peripatus.gen.nz/Paleontology/Ordovician.html
The Ordovician was an age of evolutionary experimentation, in which new organisms evolve to replace those that died out at the end of the Cambrian. It was one ...
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75 Definition of Ordovician period in Biology.
http://kolibri.teacherinabox.org.au/modules/en-boundless/www.boundless.com/biology/definition/ordovician-period/index.html
The first bryophytes (liverworts) probably appeared in the Ordovician period, about 450 million years ago. · By the Silurian period, however, vascular plants had ...
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76 ORDOVICIAN OF THE WORLD - Instituto Geológico y Minero
https://www.igme.es/isos11/ORDOVICIAN%20OF%20THE%20WORLD.pdf
A sixth decade of the Ordovician Period: status of the research infrastructure of a geological sys- tem. In: Gutiérrez-Marco, J.C., Rábano, I. and García- ...
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77 Minnesota at a Glance
https://conservancy.umn.edu/bitstream/handle/11299/59440/mn_glance_fossil_guide.pdf?sequence=69&isAllowed=y
by marine animals whose fossil shells remain in the bedrock. ... what is known as the Ordovician Period. ... The high-energy shoreline environment in.
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78 Geologists produce new timeline of Earth's Paleozoic climate ...
https://news.mit.edu/2021/geologists-produce-new-timeline-earths-paleozoic-climate-changes-0201
“We found that when it was warmer at the end of the Cambrian and early Ordovician, there was also a peak in microbial abundance,” Goldberg says.
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79 Climate and evolution in times past | Ars Technica
https://arstechnica.com/science/2008/07/climate-and-evolution-in-times-past/
The earth's climate 450 million years ago (the Ordovician period) is one of the big unknowns. Past studies have looked at the 18O content of ...
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80 The Ordovician Period- First Vertebrates
https://www.secretsofuniverse.in/history-of-life-6-ordovician-period/
The triggers of the event might have been the changes in geography, that led to creating new environments. Another study suggests that it was the dropping of ...
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81 Learn About Ordovician Period | Chegg.com
https://www.chegg.com/learn/biology/introduction-to-biology/ordovician-period
The Ordovician period in geological time is the second period of the Paleozoic era that started around 485 million years ago and ended 443 million years ago.
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82 Palaeoecological Analysis of the Decline in Stromatolite ...
https://corescholar.libraries.wright.edu/cgi/viewcontent.cgi?article=1869&context=etd_all
Ordovician Life, Tectonics and Climate. The Ordovician Period is the second period in the Paleozoic Era. It was preceded by the.
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83 Late Ordovician Life - Limper Museum - Miami University
https://miamioh.edu/cas/academics/centers/limper-museum/local-geology/history/ordovician-life/index.html
Global climate during the Ordovician was generally warmer (compared to the present). · The area that would later become southwestern Ohio was about 20° south of ...
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84 plants in the ordovician period - Grafton Motors
https://graftonmotors.ie/ygy/plants-in-the-ordovician-period
T.M.L. The only land life was in the form of very primitive plants very near the water line of the coasts, probably mosses and algae and were of a non-vascular ...
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85 Precambrian Time and the Paleozoic Era
https://www.djuhsd.org/site/handlers/filedownload.ashx?moduleinstanceid=5063&dataid=7418&FileName=05%20Pages%20215-220.pdf
each layer reveal information about the environment when the layer formed. ... the Ordovician Period, as during the Cambrian Period and.
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86 26 Ordovician period ideas | paleontology, prehistoric, fossils
https://www.pinterest.com/kramaeker/ordovician-period/
The Ordovician climate was pretty mild throughout the world and the period. The weather was warm and there was a lot of moisture in the atmosphere.
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87 Cambrian-Ordovician Periods - SlideShare
https://www.slideshare.net/hzharraz/cambrianordovician-periods
48. Life of the Ordovician Fauna: Nearly all the important groups of the marine animals are represented. The most important members of the Ordovician fauna ...
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88 The Ordovician Period: Climate and Geogr | Book 276711
https://www.bookemon.com/book-profile/the-ordovician-period-climate-and-geography/276711
A book on the changing geography and climate during the Ordovician period. | Book 276711 by: Alexis Ball theme: Presentation format: 7"x10" ...
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89 Evidence from Middle Ordovician paleosols for the ...
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/37/1/91/193534/Evidence-from-Middle-Ordovician-paleosols-for-the
A period of warming and sea-level rise during the late Katian is marked by the widespread occurrences of oceanic anoxia in paleotropical and ...
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90 The Ordovician Period - Facts and Pictures - Dinosaurs
https://www.newdinosaurs.com/the-ordovician-period/
The Ordovician Period began about 485 million years ago and ran up until about 440 million years ago. This period was defined by Charles Lapworth in 1879 ...
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91 Chitinozoan Biodiversity in the Ordovician of Gondwana
https://ecommons.udayton.edu/cgi/viewcontent.cgi?article=1063&context=uhp_theses
Ordovician Period (488 million years ago) and diversify rapidly through the Paleozoic Era. The Ordovician. Period was a time of great global climate change, ...
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92 Geologic History of Georgia
https://www.georgiaencyclopedia.org/articles/science-medicine/geologic-history-of-georgia-overview/
During the Late Cambrian and Early Ordovician periods, carbonate rocks, or limestones, were deposited in the warm, shallow waters of this sea.
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93 Ordovician Facts for Kids
https://kids.kiddle.co/Ordovician
The Ordovician is the second period of the Paleozoic era. It lasted from about 485.4 million years (mya) to 443.4 mya. It follows the Cambrian period and is ...
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94 The Paleozoic Era - Global Climate
https://www.climate-policy-watcher.org/global-climate-2/paleozoic-era.html
The Early Paleozoic ended, rather abruptly, with the short, but apparently severe, Late Ordovician Ice Age. This cold spell caused the second- ...
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