Ordovician: Difference between revisions
(Created page with "{{Wikipediainfo}} The '''Ordovician''' was an era of Earth's history dating from 488 million to 443 million BC. It was an era of hard-shelled sea creatures such as trilobites, with no life truly living on land yet. It was bookended by two extinction events: the Cambrian-Ordovician extinction event and the Ordovician-Silurian extinction event. (PROSE: {{cs|Prehistory Repeating Itself (feature)}}) {{Geologic time scale}} Category:Eras") |
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The '''Ordovician''' was an | The '''Ordovician''' was an period of [[Earth]]'s history, dating from 488 million to 443 million [[BC]], which was bookended by two [[extinction event]]s: the [[Cambrian-Ordovician extinction event]] and the [[Ordovician-Silurian extinction event]]. | ||
Concluding the [[Cambrian]], the Cambrian-Ordovician extinction event was likely due to a change in [[sea level]], [[flood]]ing portions of the two [[super-continent]]s. | |||
The dominant [[lifeform]]s throughout the Ordovician were hard-[[shell]]ed [[sea]] [[creature]]s such as [[trilobite]]s, [[brachiopod]]s, [[sea star]]s and [[coral]]s. Between [[ice age]]s, the [[atmosphere]] was [[hot]] and heavy in [[carbon dioxide]], together with plenty of [[sulphur]]. During the glaciated periods, the [[temperature]] droppped radically. | |||
Leading into the [[Silurian period]], the cause of the second set of extinctions was less clear, with hypotheses ranging from more [[glaciation]] to a change in carbon dioxide levels, or even a [[gamma ray burst]] from a [[dying]] [[star]] that destroyed the [[ozone layer]]. It could even have been the result of [[alien]] meddling, providing a [[mystery]] which [[Adventurers (Player's Guide)|time travellers]] may have potentially investigated. ([[PROSE]]: {{cs|Prehistory Repeating Itself (feature)}}) | |||
{{Geologic time scale}} | {{Geologic time scale}} | ||
[[Category:Eras]] | [[Category:Eras]] | ||
Latest revision as of 04:43, 5 November 2024
The Ordovician was an period of Earth's history, dating from 488 million to 443 million BC, which was bookended by two extinction events: the Cambrian-Ordovician extinction event and the Ordovician-Silurian extinction event.
Concluding the Cambrian, the Cambrian-Ordovician extinction event was likely due to a change in sea level, flooding portions of the two super-continents.
The dominant lifeforms throughout the Ordovician were hard-shelled sea creatures such as trilobites, brachiopods, sea stars and corals. Between ice ages, the atmosphere was hot and heavy in carbon dioxide, together with plenty of sulphur. During the glaciated periods, the temperature droppped radically.
Leading into the Silurian period, the cause of the second set of extinctions was less clear, with hypotheses ranging from more glaciation to a change in carbon dioxide levels, or even a gamma ray burst from a dying star that destroyed the ozone layer. It could even have been the result of alien meddling, providing a mystery which time travellers may have potentially investigated. (PROSE: Prehistory Repeating Itself [+]Loading...["Prehistory Repeating Itself (feature)"])
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