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The Ordovician Period - 7th Science

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Abigail Hyer

on 24 March 2014

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Transcript of The Ordovician Period - 7th Science

The Ordovician Period
Plants and Animals during the Ordovician Period
When was it?
-During this time, most of the continents formed the super continent of Gondwana. This continent included the land of Africa, South America,Southern Europe, Australia, and Antarctica.
-In time, Gondwana drifted south and settled on the South Pole.
-Also, during that time, the super continent Laurentia (which contained Northern Europe and North America) existed.
-Laurentia settled along the equator, separated from Gondwana only by a small ocean.
- Some common species of Ordovician animals are:
- Blastoids, Bryozoans, Corals, Crinoids, and several other species including snails and clams
- Blastoids or sea buds are a stemmed echinoderm.
- Bryozoans are a sedentary aquatic invertebrate of the phylum Bryozoa.
- Corals are a substance made of marine coelenterates as an external skeleton. They usually form in warm seas.
- Crinoids are echioderms in the class Crinoidea. They have a cup-like body, radiating arms, and barios fossil forms.

-During the beginning of the time period, the climate was typically warm and wet.
-Around this time the average temperature was estimated to be around 113 degrees Fahrenheit or 45 degrees Celcius.
-However, when Gondwana stopped moving near the South Pole, the climate turned icy and cold; this caused the extinction that ended the Ordovician time period.

- The Ordovician Period began about 488.3 million years ago.
- It lasted for nearly 45 million years before it ended around 443.7 million years ago.
-The Ordovician began because of an extinction event, eliminating several species of trilobytes, brachiopods, and conodonts, which ended the Cambrian period.
- The Ordovician ended because of a mass extinction,where nearly 60% of marine life went extinct. This is one of the largest extinctions ever recorded.
- During the Ordovician, life mostly consisted of plants and marine animals.
- Their fossils are usually found in rocks such as shale, limestone, dolostone, and sandstone.
What the land masses most likely looked like
An animal of the Ordovician Period
Map of the Average Temperatures in the Late Ordovician
- Some common fungi species during this time were:
-Green algae, lichens, and arbuscular mycorrhiza fungi
-Green algae were very common and led to the evolution of terrestrial plants.
-Arbuscular Mycorrhiza fungi played an important role in the plants moving onto land.

An Artist's Estimate of what the plant life in the ocean probably looked like
Bryozoan Fossil
Fossilized Remains of Blastiods
The Ordovician Extinction
-The Ordovician extinction is the second largest extinction event. It is second only to the Triassic-Permian extinction.
-This caused the disappearance of one third of all brachiopod and bryozoan families, which also affected groups of conodonts, trilobites, and graptolites.
-Overall, around 100 families were destroyed.
-Around 26% of marine families, 60% of all marine genera, and 82%-88% of all species went extinct.
-The Ordovician period was a time period that lasted for 45 million years.
-It ended with a mass extinction, one of the largest ever recorded
-During this time, the plants and animals were mostly found in the ocean.
-It ended 443.7 million years ago.
Plants and Animals Pictures
A Criniod Fossil
Green Algae
-The Ordovician Period was the second period of the Paleozoic Era.
-During this time, life forms diversified dramatically and were the basis of many marine forms today.
-For the first time, plants were able to inhabit the land, which up to this point was barren.
-Some common plant species during the Ordovician Period were:
-Liverwort-like plants, bryozoan plants,triletes, and cooksonia
-Liverwort-like plants were some of the first terrestrial plants.
-The bryophyte moss animal was the result of the role of the Arbuscular Mycorrhiza making mineral nutrients available to plants.
-Cooksonia is a simple vascular plant and an early plant that lived in shores.
-Triletes were believed the ancestors of most modern land plants.
The Cooksonia plant
Triletes cell
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