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The Paleozoic Era was 359.2 to 299 million years ago. (Also known as the Carboniferous Period.

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Plants and animals had an effect on the atmosphere in the Carboniferous Period, "As plants became firmly established on land, life once again had a major effect on Earth's atmosphere during the Carboniferous Period. Oxygen made up 20 percent of the atmosphere—about today's level—around 350 million years ago, and it rose to as much as 35 percent over the next 50 million years."

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There were swamps and trees, but there was much Peat. This was a brown, soil-like material characteristic of boggy, acid ground, consisting of partly decomposed vegetable matter. It is widely cut and dried for use in gardening and as fuel. Here is a diagram on how coal was formed. Carboniferous Coal was formed by trees that grew in swamplands.Over time the plant debris formed the world's first coal deposits. Amazingly we are still using this coal to this day.

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The Average temperatures during the Carboniferous period, were moderately hot. 68 degrees fahrenheit in the early period, but it cooled during the middle of the period. It was 54 degrees fahrenheit. Based on this chart, the temperature was similar to the Earth's today.

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This was a time when Marine life was abundant and unique. Shallow, warm, marine waters often
flooded the continents.  Filter feeders such as bryozoans, particularly fenestellids, were abundant in this environment, and the sea floor was controlled by brachiopods. Trilobites were  scarce while foraminifera were abundant. The heavily armored fish became extinct, being replaced with more modern-looking fish fauna

These are the Trilobites.

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This is the Placoderm, which was a heavily armored fish, that lived in the Carboniferous Period. It became Extinct at the end of the Devonian Period.

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The Giant Arthropleura Millipede from the Carboniferous Period.

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The Carboniferous Period, located between the Permian and the Mississippian Period.

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The mass extinction was at the end of the Moscovian Era.The rainforest collapsed and most new species were killed and went extinct.

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The Mississippian Period came after the Paleozoic Era

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The End of the Paleozoic Era was 298.8 Years ago.

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Earth's climate during this period was fairly warm. It was similar to Earth's climate today. There were trees and branches over head, which blocked out some of the air in the atmosphere. Thus caused the air to be humid and warm.

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Mostly plants evolved during the Carboniferous period. The Lycopods went through extinction during a dry period of time. "Ferns and Sphenopsids became more important later during the Carboniferous, and the earliest relatives of the conifers appeared."

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The hot and humid climate of the Middle Carboniferous Period was accompanied by an explosion of terrestrial plant life.

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Britannica, The Editors of Encyclopedia. “Tracheophyte.” Encyclopedia Britannica, Encyclopedia Britannica, Inc., 31 Aug. 2016, www.britannica.com/plant/tracheophyte.

“Carboniferous Period and Prehistoric Facts.” Information and Prehistoric Facts | National Geographic, 10 Jan. 2017, www.nationalgeographic.com/science/prehistoric-world/carboniferous/.

“Equisetopsida.” Wikipedia, Wikimedia Foundation, 25 Apr. 2018, en.wikipedia.org/wiki/Equisetopsida.

“10 Terrific Facts About Trilobites.” Mental Floss, 24 Sept. 2015, mentalfloss.com/article/68881/10-terrific-facts-about-trilobites.

Erjavec, James. “Extinction Events.” Pinterest, 29 Apr. 2015, www.pinterest.com/pin/385480049332211911/.

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Some Floras that still existed were the horsetail rush, it was the only flora that existed in the earlier periods. These were  cylindrical stem like leaves. They are found in moist shady locations.

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This is what the Earth looked like during this period.

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The main type of Flora that was most abundant was the Vascular Land Plants called Tracheophytes. These were "small shrubby growths", that could exceed 100 feet tall.

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“Horsetail Rush.” The Pond Guy, www.thepondguy.com/product/horsetail-rush/water-gardens-fish-ponds-bog-plants.

Hieb, Monte. “Plant Fossils of West Virginia.” Climate during the Carboniferous Period, 21 Mar. 2009, www.geocraft.com/WVFossils/Carboniferous_climate.html

Origin of Coal, butane.chem.uiuc.edu/pshapley/environmental/l4/1.html.

“Carboniferous Period and Prehistoric Facts.” Information and Prehistoric Facts | National Geographic, 10 Jan. 2017, www.nationalgeographic.com/science/prehistoric-world/carboniferous/.

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The Change in the Atmospheric Conditions

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The Change in the Atmospheric Conditions

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The Nitrogen Levels in the air did not drop. The air Pressure was increased.

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Freshwater Clams came into existence, and there was a variety of bony fish and different kinds of sharks. Predators with long snouts, short sprawling limbs and flattened heads called the temnospondyls, appeared also. They looked like this: