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After the long ice age, the ice melted and flooded Southern Ontario. This brought lots of marine animals in to live. After this period the land began to dry, and paved the way for humans.
At this time, Southern Ontario was above Sea level and was part of the super continent Pangaea. During this time period, the land of Southern Ontario was mainly dominated by dinosaurs. Some of the many dinosaurs that were roaming Ontario include: Tyrannosaurus Rex, Parasaurolophus, Deinonychus, and Lambeosaurus are just some examples. Most of the rocks deposited during this time period, are below the surface, or they were eroded away over time. However there is some record of lakes, wetlands, and rivers stretching across Southern Ontario during this time period.
During the Precambrian age Southern Ontario was mainly covered by bedrock. This bed rock was subjected to tropical climates which caused enrichment of minerals to further develop the bed rock surface. However, also during this period there was an abundance of stromatolites through out Ontario. The first stromatolites that would have formed here was blue green algae. This algae started to convert carbon dioxide into oxygen and made way for life on earth.
During this Era, the Canadian shield had just began to form. Most fossils in Ontario are found in the Paleozoic rocks and they show the life that lived in the shallow seas. Near the shore of lake Huron you can see many corals, trilobites, sea lilies and other invertabreas living during the Paleozoic time period. There was no polar ice, and the sea water flooded over Ontario, leaving many shallow seas. During this time, Ontario was part of the super continent Laurentia. Trilobites being only a few centimeters long were in an abundance in Southern Ontario, with the largest one being 30 centimeters.
During this period of time, 97% of Canada was covered in ice. The animals that lived in Ontario during this period had to adapt to the ice age. Many of the animals living in Southern Ontario during this time were animal like elephants with large tusks and teeth. These animals also had large fur coats to deal with the cold weather and they were herbivores. The result of all the glaciers was large amounts of deposit left throughout ontario, along with landforms.