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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 Age 10 of the Furongian epoch of the Cambrian and lasted from 486.85 to 471.3 million years ago, until the Dapingian age of the Middle Ordovician .
The Ordovician saw the highest sea levels of the Paleozoic, and the low relief of the continents led to many shelf deposits being formed under hundreds of metres of water. [41] The sea level rose more or less continuously throughout the Early Ordovician, leveling off somewhat during the middle of the period. [41]
The Sandbian is the first stage of the Upper Ordovician.It follows the Darriwilian and is succeeded by the Katian.Its lower boundary is defined as the first appearance datum of the graptolite species Nemagraptus gracilis around 458.2 million years ago.
This category includes biological taxa of rank more inclusive than genus that evolved during the Ordovician period of geologic time, between 485.4 and 443.8 million years ago, as well as genera and species that evolved during this time and persisted across multiple geological periods
The Ordovician Period of the Paleozoic Era, in the Phanerozoic Eon. This category contains events which happened in the Ordovician, a division of the geologic time scale. See geologic time scale for information about its divisions and how they relate to each other.
Biological taxa that first appeared during the Early Ordovician epoch of geologic time, between 485.4 and 470 million years ago. See also the preceding Category:Furongian first appearances and the succeeding Category:Middle Ordovician first appearances
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This page was last edited on 3 November 2023, at 00:12 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.