Precambrian- Emily Nguyen

Paleozoic- Davis Shirley

Mesozoic- Gabi Sadurski

Cenozoic- Cassie Peterson

ANIMAL LIFE

At this time, it is believed that the animals called Ediacaran biota, evolved from protists. However there is scientific evidence to prove that there were more complex organisms that were not soft bodied sea creatures. During this era their lived a sponge-like fossil called Cornoacollina acula, that is believed to have been one of the first hard bodied organisms of its time. The some plants that lived during this time are the Lichens. They are believed to have been the first fungi to photosynthesize other organisms live algae and bacteria.

Precambrian Era

Climate

The climate during the Precambrian Era was steaming hot. It had many volcanoes which helped to increase the temperature of the earth. There was a shortage of volcanoes which limited the amount of carbon dioxide that was emitted. The oceans during this time had a lot of volcanic ash and debris which helped to create new minerals. The extreme greenhouse gasses helped to keep the surface temperature just right for animal life. The greenhouse gasses also helped to counteract against the suns harmful radiation

Hadean Period

During the Hadean period, the solar system was forming. Due to scientific evidence, the excess amount of heavy elements in the solar system helped to form the earth through a super nova. The sun will be formed in this period which will eventually lead to the formation of the earth.

Archean Period

During the Archean period, the atmosphere was filled with many harmful gasses such as methane and ammonia. During thus time the earts crust was cool enough for rocks and continental plates could form.

Proterozoic Period

The first traces of life on earth appeared in the Proterozoic period. During this time oxygen levels also increased due to photosynthesis. The oceans changed significantly during this time. This period is most known for the breaking up of the super continent. The Cambrian Explosion led to the end of the Precambrian Era.

Paleozoic Era

The Paleozoic Era last from 544 to 245 million years ago. It was divided into six different periods. It was the age of marine life because every living thing lived in the water in this Era.

The Organisms

By the end of the Paleozoic, cycads, glossopterids, primitive conifers, and ferns were spreading across the landscape. tabulate andrugose corals, blastoid echinoderms, graptolites, and most crinoids died out, as did the last of the trilobites

Cambrian Period

Hard-shelled animals in great numbers in this period.

Ordovician Period

It was the time life diversified and specialized.

Silurian Period

This was when the sea level rose and the climate stabilized

Devonian Period

This was when reef ecosystems saw new and varied forms.

Carboniferous Period

It was divided into the Mississippian and Pennsylvanian Period. The continents below the equator still formed Gondwana the super continent.

Permian Period

This was the ending of the Paleozoic Era.

The Mesozoic Era was 65 million years ago. It was divided into three different periods, the Triassic period, the Jurassic Period and the Cretaceous Period. This Era is mostly known for dinosaurs.

Mesozoic Era

Triassic Period

The Triassic Period was the time of the first dinosaurs and mammals. During this time the Earth's continents were formed into one giant landmass called Pangaea. The climate was usually dry with hot summers and cold winters but no polar ice caps. It was said to end by climate change causing volcanic eruptions.