Coocoocrazy+Silurian

__Silurian__ __440-410 million years ago__   By: Coocoocrazy Homepage :) __Silurian: Before, During, and After.__

 Silurian was the start of many new things, 440-410 million years ago. Animals such as fish were getting bones, jawless fish were evolving, and plants were beginning to grow. Not only that, but where everything was developing so was the Coral Reef. Ordovician period was about 100 million years before Silurian. In that time very little plants were developing and some jawless fish first started to appear. That’s how it leads in to this era, Silurian. The period after Silurian was Devonian. By that time plants were already fully growing more and more, and insects were coming along. Fish were not the only things swimming in the water, so was sharks.

__Continents in the Silurian time.__

In the Paleozoic era Silurian, many things were different then they are now, the climate, the structure of the continents, and everything in-between. The climate changed to various things. At first it would be warm, with seas mild and shallow. Most of the continents were all together. Not how it is now, where all the continents are in every hemisphere.

During the Silurian times the continents were mostly on the southern hemisphere or on the equator. Many people wonder where Massachusetts was in this time. Well, North America was around the equator and connected to Canada. Therefore Massachusetts was around the equator, rather than where it is now, In the northern hemisphere.

__Landforms: Rocks, An__ __d Fossils.__

In this time period a lot of animals that were alive then, may have been hardened into a rock or sand. Many fossils of animals were found. Such as: Graptolites- Click here Trilobites- Click here Crinoids- Click here Brachiopods- Click here

Mountain-buildings in eastern North America and in northwestern Europe, ended up in a formation of the mountain chains there. In other parts of the land large rock formations happened in Central Europe. Glaciers formed, but also melted, which as I mentioned, it caused the sea's to rise. Due to the sea level rising, it made new room for habitats for many more marine animals. If you want to find more fossils, rocks, or landforms, you can find them in South China, Siberia, Australia, and Northern Europe. There were many sand mountains in the Silurian time, kind of looked like a desert, just with an ocean. There weren't A LOT of volcanoes but there was many. Some causes that t he volcanoes caused was it made rocks. Two types of rocks were granite, and basalt. Click here for picture.

__Life on Earth: Plants and Animals.__

Plants- There was a plant in this time called // __Cooksonia__ // //. //It was a branching-stemmed plant which had sporangia at the tip of it. Also n one of the plants from this time had leaves. Another plant was called // __Baragwanathia__ //. It was more complex that Cooksonia. These pl ants can be found in northern hemisphere, Australia, Europe, Asia, and Africa.

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 120%;">Animals- Animals that were living in this time were : Conodonts, Graptolites, Brachiopods, Arthropods,Trilobites, Corals, Mollusks, Crinoids and Stromatoporoids. <range type="comment" id="177183">Some of them had vertebrates, some were jawless fish, and some fish had jaws. New life forms in the time were mostly the plants,they wernt fully developed into forests or a bunch of giant plants until the next era. New things appeared also, like spiders, millipedes, and centipedes. They were not seen often because they had a good hiding habitation.

Plant pictures- Click here

__Interesting <range type="comment" id="783421">fact about Silurian:__ <span style="font-family: Arial,Helvetica,sans-serif; font-size: 120%;">One of them getting eaten...
 * A British guy names Murchison found fossils in Whales. He then called this time SILURIAN because of those fossils were found in an area of Whales where a Celtic tribe lived. Silures is the Roman name for them.
 * The oxygen <range type="comment" id="452870">was 30% below today.
 * <span style="background-color: #ffffff; display: block; font-family: 'Droid Sans',Arial,sans-serif; text-align: justify;"> Around the beginning of the Silurian period there was the Ordovician-Silurian extinction events. It was the second-largest set of extinctions in the history of the planet after the larger Permian-Triassic which wiped out 60% of all marine organisms.
 * <span style="font-family: Arial,Helvetica,sans-serif; font-size: 120%;">There was HUGE Arthropods:


 * 1) [|Click here for External links if you want to know more about Silurian :)]
 * 2) [|Here's another external link to find out more about my topic, but also the other era's before and after Silurian.]
 * 3) Bibliography
 * 4) Reflection on my project