Ordovician Period - Cal Poly Humboldt Natural History Museum
Aug 10, 2012 · The Ordovician* lasted about 45 million years and saw the transition from very primitive to relatively modern life-forms in the seas. The “Ordovician radiation” which followed …
Ordovician Period | Major Events, Extinction, & Facts | Britannica
Dec 24, 2024 · Ordovician Period, in geologic time, the second period of the Paleozoic Era. It began 485.4 million years ago, following the Cambrian Period, and ended 443.8 million years …
Prehistoric Life During the Ordovician Period - ThoughtCo
Oct 13, 2019 · The Ordovician is the second period of the Paleozoic Era (542-250 million years ago), preceded by the Cambrian and succeeded by the Silurian, Devonian, Carboniferous and …
Ordovician - Wikipedia
The Ordovician Period in Britain was traditionally broken into Early (Tremadocian and Arenig), Middle (Llanvirn (subdivided into Abereiddian and Llandeilian) and Llandeilo) and Late …
The Ordovician Period - University of California Museum of …
The Ordovician is best known for its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates). A typical marine community consisted of …
Ordovician Period—485.4 to 443.8 MYA - U.S. National Park Service
Apr 28, 2023 · The sea teemed with life different from its Cambrian predecessors such as bivalves, gastropods (snails), bryozoans (moss animals), and crinoids (sea lilies). Bryozoans …
Ordovician Period Information and Facts - National Geographic
Learn more about the time period that took place 488 to 443 million years ago. During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the vast …
Ordovician - New World Encyclopedia
In the seas, which covered much of the continental land mass, one prominent form of life was the cephalopods, a group of mollusks related to the squid and octopus, while trilobites and …
Ordovician Period - peripatus.gen.nz
About 480 million years ago, in the Ordovician period, life forms diversified dramatically and gave rise to many of the marine forms familiar today. The fossil record of this period is amazingly …
The Ordovician Period - Paleontology World
The Ordovician is best known for its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates). A typical marine community consisted of …