Ordovician Period - Natural History Museum
WEBAug 10, 2012 · Artist’s depiction of the rich fauna of the Ordovician. Animals include, from left: Cystoids, jawless fish (Sacabambaspis) captured by a large cephalopod (Endoceras), Rugose corals, brachiopods, trilobite, gastropod (Cyclonema), a …
Ordovician Period | Major Events, Extinction, & Facts
WEBAug 9, 2024 · Ordovician Period, in geologic time, the second period of the Paleozoic Era. It began 485.4 million years ago and ended 443.8 million years ago. The interval was a time of intense diversification (an increase in the number of species) of marine animal life in what became known as the Ordovician radiation.
Ordovician Period Information and Facts - National Geographic
WEBThe few complete fossils that have been found suggest they were finned, eel-like creatures with large eyes for locating prey. The conodonts are now thought to have been true vertebrates; however,...
Ordovician - Wikipedia
WEBThe Ordovician (/ ɔːrdəˈvɪʃi.ən, - doʊ -, - ˈvɪʃən / or-də-VISH-ee-ən, -doh-, -VISH-ən) [9] is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period 485.4 Ma (million years ago) to the start of the Silurian Period 443.8 Ma. [10]
The Ordovician Period - Paleontology World
WEBRemains of ostracoderms (jawless, armored fish) from Ordovician rocks comprise some of the oldest vertebrate fossils. Despite the appearance of coral fossils during this time, reef ecosystems continued to be dominated by algae and sponges, and …
Sacabambaspis - Wikipedia
WEBSacabambaspis is an extinct genus of jawless fish that lived in the Ordovician period. Sacabambaspis lived in shallow waters on the continental margins of Gondwana. [1] It is the best known arandaspid with many specimens known.
3 - The Ordovician Enigma - Cambridge University Press
WEBDec 31, 2018 · The Ordovician history of fish is limited by a combination of biological, environmental and taphonomic constraints but appears to contain significant milestones referencing the first appearances of a number of major …
Atlas of Ordovician Life – Exploring the fauna of the Cincinnati …
WEBExplore the diversity, systematics, biogeography, and stratigraphy of Late Ordovician fossils of the Cincinnati, Ohio region. Enter the Atlas. Kope through Bellevue strata, Maysville, KY.
Chapter 11 (The Later Ordovician) - University of Houston
WEBFigure 11.9: The fossil remains of Ordovician fish mainly consist of isolated plates and scales in marine rocks, although small bony scales resembling fish scales were recently found in Upper Cambrian sandstones in Wyoming.
The tail of the Ordovician fish Sacabambaspis | Biology Letters
WEBNov 14, 2006 · The tail of the earliest known articulated fully skeletonized vertebrate, the arandaspid Sacabambaspis from the Ordovician of Bolivia, is redescribed on the basis of further preparation of the only specimen in which it is most extensively preserved.