Paleozoic Era
The Paleozoic Era was an era that lasted from around 600 million years ago to 230 million years ago. Here in the Paleozoic, the Earth's interior has cooled down to something like modern levels, so that volcanic activity is usually about as humanity experiences it: a few minor eruptions like Mount St. Helens each year, and major ones like Krakatoa every century or so. However, gigantic "hot-spot" type eruptions still occur every hundred million years or so. During the Cambrian Era, the first period of the Paleozoic Era, there was an abundance of hard-shelled organisms, including the famous trilobite, which has been found in many areas around the world. Additionally, the first vertebrate, a small fish, came into existence during the Cambrian Epoch, although life was still restricted to the seas. During the next period, the Ordovician period, seas had spread across much of North America, and many new animals, including shellfish, coral, and fishlike vertebrates had developed. Life finally spread onto the land in the following Silurian period, and the land had now exhibited
arachnids and simply pants. The following period, the Devonian period, was also known as “The Age of Fishes” due to the proliferation of fish in the seas. The same period also marked the proliferation of plant life on land as well as the first amphibians. The first reptiles on the Earth appeared in the following Carboniferous period, which is responsible for many of the oil deposits that we have today. The climate of the Earth was very hot and moist, but cooled down in the following
Permian period, which was characterized by the first conifers (a type of gymnosperm) as well as the formation of glaciers in many areas. The Appalachian Mountains also formed during this period, but a mass extinction spelled the end of this period and of the Paleozoic Era, as 90% of all species of life on Earth had disappeared in this mass extinction (The Cambrain Explosion); all within a few million years. These mass dying were probably caused by climate changes and periods of giant volcanic eruptions. Some were mostly invertebrates.
arachnids and simply pants. The following period, the Devonian period, was also known as “The Age of Fishes” due to the proliferation of fish in the seas. The same period also marked the proliferation of plant life on land as well as the first amphibians. The first reptiles on the Earth appeared in the following Carboniferous period, which is responsible for many of the oil deposits that we have today. The climate of the Earth was very hot and moist, but cooled down in the following
Permian period, which was characterized by the first conifers (a type of gymnosperm) as well as the formation of glaciers in many areas. The Appalachian Mountains also formed during this period, but a mass extinction spelled the end of this period and of the Paleozoic Era, as 90% of all species of life on Earth had disappeared in this mass extinction (The Cambrain Explosion); all within a few million years. These mass dying were probably caused by climate changes and periods of giant volcanic eruptions. Some were mostly invertebrates.
 |  | 
| 
| 
|
| 
| 
| 
|
RSS Feed
![](http://justjennrecipes.com/wp-content/uploads/2013/02/angel1-504x300.jpg")