Ordovician Sea Floor

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 sea floor. Also invertebrates burrowed into the seafloor more intensely during the ordovician period than in the cambrian period reaching depths of up to 1 metre 3 feet below the seafloor. In fact if you went to the beach anytime from 550 to 250 million years ago most of the shells you would have collected would have been brachiopods. ə n or də vish ee ən doh vish ən 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 million years ago mya to the start of the silurian period 443 8 mya. These uplifts are seen as the precursor to glaciation.

The ordovician ɔːr. D ə ˈ v ɪ ʃ. During the ordovician brachiopods were the dominant shellfish and occurred abundantly on the seafloor globally. It began 485 4 million years ago and ended 443 8 million years ago.

Stroms are calcareous sponges that form mounds 2 to 3 feet across on the sea floor. The ordovician period lasted almost 45 million years beginning 488 3 million years ago and ending 443 7 million years ago during this period the area north of the tropics was almost entirely ocean and most of the world s land was collected into the southern supercontinent gondwana. During the ordovician they generally lived anchored to the sea floor by a stalk that could be metres or even tens of metres long living in huge underwater prairies looking more like flowers than the animals they are. The ordovician named after the welsh.

The ordovician radiation which followed the late cambrian extinctions lead to a tripling of marine diversity the greatest increase in the history of life and giving the highest levels of diversity seen during the paleozoic era. The causes of the ordovician radiation remain unclear. ə n d oʊ ˈ v ɪ ʃ. Most modern forms don t have a stem and can crawl or swim though slowly.

Increased sea floor spreading and ridge activity accompanied by volcanic activity occurred in the llanvirnian. Ordovician period in geologic time the second period of the paleozoic era. One of the lesser known geologic spans in the earth s history the ordovician period 448 to 443 million years ago didn t witness the same extreme burst of evolutionary activity that characterized the preceding cambrian period. Ordovician fossil stromatoporoids can be seen along roadcuts in the blue grass region especially near lexington where the white mounds contrast against the gray limestones.

The ordovician lasted about 45 million years and saw the transition from very primitive to relatively modern life forms in the seas. Also during the middle ordovician latitudinal plate motions appear to have taken place including the northward drift of the baltoscandian plate northern europe.