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The Ordovician Time Period

A presentation by Liz Cable and Lauren Tishkevich on the development of our world during this time period.

Lauren Tishkevich

on 10 March 2011

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Transcript of The Ordovician Time Period

The Ordovician Time Period late middle tremadoclan llanvirnina ashgillian Ordovician Time Period The Ordovician Time Period began 490 million years ago and lasted about 47 milion years. The Ordovician Period was the second period of the Paleozoic Era The Ordovician Time Period is under the Phanerozoic Eon, the Paleozoic Era. It is the 5th on down and has the first vertebrates. Climate squidlike nautiloids condonts fish Horseshoe Crabs graptolites cephalopods stromatoporoids Plants and Animals of the Period Late Ordovician In the late Ordovician, the supercontinent was covered by a huge Ice Cap. This sudden climate change was responsible for the death of almost half of all marine life, the second biggest demolition of a species ever. Early Ordovician The earlier part of the period had a warm and wet climate. Various marine animals thrived at this time geography Gondwana Oceans Major Events Why is this Period important? Vertebrate fossils Extinction Transgression The end of the Ordovician Time Period Ice Age The Ordovician Time Period ends in huge extinction, due to glaciation. The Ordovician Time Period went through a major transgression in the Middle Ordovician, which created widespread shallow, warm epicontinental seas The supercontinent of Gondwana drifted over the south pole, initiating a great Ice Age that gripped the earth at this time. This important period saw the origin and rapid evolution of many new types of invertebrate animals which replaced their Cambrian predecessors. Primitive plants move onto land, until then totally barren. About 60% of animal genera became extinct, making this the second or third most deadly mass extinction of the Phanerozoic Gondwana was the name of the supercontinent in place during the Ordovician time period. It contained Africa, South America, Antarctica and Australia The oceans of the Ordovician Time Period were the habitat of mostly all life forms. Marine animals flourished. But, after the ice cap formed in the later part of the period, the oceans levels dropped greatly. A type of tentacled mollusk, these prehistoric animals had gas filled chambers in their conical heads, which propelled them off the seabeds and allowed them to move easily Condonts are mainly know by the tiny fossil teeth they left behind. The few complete skeletons found suggest that they looked like long, finned eels During this time period, horseshoe crabs started to come ashore and into lagoons. They began evolving and they are sometimes referred to as “living fossils”, because they have not evolved in much since then, which is quite a long period of time to never change. Also during this period, fish became abundant. They, however were not like modern fish- they had small, downward-pointing, jawless mouths, which leads scientists to believe that they sucked in their prey from the seabed rather than chew things up. Lampreys and Hagfish are this type of fish’s descendents. Graptolites were small marine animals that lived in little "cups" which were combined into a string. The colonies looked twig-like. Stromatoporoids formed massive skeletons- some of the domes were about 5 meters in diameter. They grew by excreeting calcerous sheets which ten formed layers of growth, like rings in a tree stump. Cephalopods are an animal group which animals like the squidlike nautiloids. It is characterized by bilateral body symmetry, a prominent head, and a modification of the mollusk foot, a muscular hydrostat, into the form of arms or tentacles by Liz Cable and Lauren Tishkevich The tremadoclan time period encompasses all rocks formed during the Tremadocian Age, which spanned the interval between 488.3 and 478.6 million years ago. early During the ashgillian period a major glaciation centered in Africa occurred. During the Llanvirnina time period there was increased sea floor spreading and ridge activity accompanied by volcanic activity
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