What happened at the beginning of the Ordovician period?
Beginning in the Ordovician Period, a series of plate collisions resulted in Laurentia, Siberia, and Baltica becoming assembled into the continents of Laurussia by the Devonian and Laurasia by the Pennsylvanian (also see Cambrian Period).
What life form first appeared during the Middle Ordovician?
One of the earliest known armoured agnathan (“ostracoderm”) vertebrate, Arandaspis, dates from the Middle Ordovician. Trilobites in the Ordovician were very different from their predecessors in the Cambrian.
What major events in geologic history occurred during the Ordovician period?
The Ordovician Period started at a major extinction event called the Cambrian–Ordovician extinction events about 485.4 ± 1.9 Mya (million years ago), and lasted for about 44.6 million years. It ended with the Ordovician–Silurian extinction event, about 443.4 ± 1.5 Mya (ICS, 2004) that wiped out 60% of marine genera.
What organisms appeared during the Ordovician period?
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 these animals, plus red and green algae, primitive fish, cephalopods, corals, crinoids, and gastropods.
Is Ordovician and Silurian older?
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 ago, when the Silurian Period began.
What plants were in the Ordovician period?
Sponges, corals and even primitive fish lived in Ordovician waters. The plant life in the water was red and green algae.
What ended the Ordovician period?
443.8 (+/- 1.5) million years ago
Ordovician/Ended
How do you pronounce Ordovician period?
Phonetic spelling of Ordovician period
- Or-dovi-cian pe-riod.
- ordovician period. Keagan Mante.
- Or-dovi-cian period. Blanche Mraz.
What organisms disappeared during the Ordovician period?
Who became extinct? All of the major animal groups of the Ordovician oceans survived, including trilobites, brachiopods, corals, crinoids and graptolites, but each lost important members. Widespread families of trilobites disappeared and graptolites came close to total extinction.
What animals went extinct during the Ordovician period?
