The First Period In The Phanerozoic Eon

Paleolithic: The Paleolithic period lasted from about 200,000 b.c. to about 10,000 b.c. It was the early phase of the Stone Age; and encompassed a steady development of stone tools, antler and bone artifacts, engraving on bone and stone, and paintings on the walls of caves and rock structures. There was not much structure built or agriculture done in this period as the people lived a nomadic lifestyle, migrating with the herds of animals they hunted for food.

The Paleolithic Period is the earliest time period man has been alive, and the longest of the Stone Age's. It dates from 2,000,000 B.C to 10,000 BC The people of the Paleolithic Period lived simple lives, which consisted primarily of survival. Man's life was simply to hunt, eat, and survive, while the woman's job was to gather and watch over the children.

     The Paleolithic Period is the earliest time period man has been alive, and the longest of the Stone Age's. It dates from 2,000,000 B.C to 10,000 BC The people of the Paleolithic Period lived simple lives, which consisted primarily of survival. Man's life was simply to hunt, eat, and survive, while the woman’s job was to gather and watch over the children.

The Jurassic Period is a time period were new dinosaurs were being discovered and found. It was about 199.6 to 145.5 million years ago. Some of the species that were found in the Jurassic Period are the Stegosaurus, Ceratosaurus, Brachiosaurus, and Allosaurus. Each dinosaur had their own characteristics for survival.

In the history of Mesoamerica, the Paleo-Indian period applies specifically to when the very first indications of human habitation within the Mesoamerican region began. An event that took place during the stone age (paleolithic) stage of human evolution.

Shifting from the end of the Permian period 250 million years ago into the next era, the Triassic period occurred between 250 and 199 million years ago and was know for further diversifying life on land. After the Permian period, the Triassic period was largely successful in adapting and evolving, as the world was going through many changes. The land mass known as Pangea began its separation, which would be completed in the Jurassic period. The climate was relatively more severe during this time, with hotter summers and colder winters, but because of the warmer atmosphere, there were no polar ice caps at this time. Towards the center of Pangea, it was mostly a dry desert climate. As for life on earth, most of the marine life had been wiped

The Cambrian Period marks the beginning of the Paleozoic Era. This period gets its name from a place in Wales where the first examples of this type of ancient life was found. The period lasted for nearly 53 million years, from about 543 million years ago until 490 million years ago. The Cambrian Period marks an important point in the history of life on earth; it is the time when most of the major groups of animals first appear in the fossil record. This event is sometimes called the "Cambrian Explosion", because of the relatively short time over which this diversity of forms appears. It was once thought that the Cambrian rocks contained the

Major Biological Event: Life evolved and diversified greatly during this Era, in an event called the Cambrian Explosion. Plants began to grow on the land and jawed fish began to appear. The first forests made of small trees and bushes forms, populated by insects, reptiles, amphibians. However, this Era ended with a max extinction in which 96% of the populus went extinct.

The Cretaceous period is a period of time within the Mesozoic Era lasting from 146 million years ago to 65.5 million years ago. It is one of three periods in the Mesozoic Era along with the Triassic and Jurassic periods. The Cretaceous period is well known for the amount of dinosaurs it had, and the event that put an end to the dinosaurs reign, the K-T mass extinction. During the K-T mass extinction, a huge asteroid hit earth and caused tons of dust to infiltrate the air. Only a small portion of dinosaurs died on impact Instead, the dust blocked out sunlight which caused plants to die. Without plants, many dinosaurs did not have a food source, so the died out. Carnivore dinosaurs, such as the Tyrannosaurus Rex, survived a little longer

The Paleolithic is divided into three phases which are Lower, Middle, and Upper. The upper stone age began about 42,000-37,000 years ago and has continued up until the ice age ended. Their ways of forms of communication are much different of the way we communicate now. Their forms of communication is visual arts which consists of

When, where and how did dinosaurs live? Dinosaurs arose around 200 million years ago and lived and evolved for about 185 million years. There were 5 eras in which dinosaurs were alive; the Archezoic Era, Proterozoic Era, Palezoic Era, Mesozoic Era and the Cenozoic Era (“Dinosaurs”). Dinosaurs roamed the entire Earth when all continents were

The Permian Period was the final period of the Paleozoic Era. This period lasted from 299 to 251 million years ago. The transition from the Paleozoic Era and the Mesozoic Era was the Permian Period. During the end of the Permian Period, Earth’s largest mass extinction occurred.

The Devonian period took place in the middle of the Paleozoic Era. Devonian period occurred between 416 million years to 358 million years ago lasting 58 million years. It is widely known as the age of fishes. A variety of fish and plants covered a vast majority of the Earth during this time. A vertebrate named a tetrapod had the capability of living on both land and in sea. The warm climate made it extremely accessible for plants to thrive on land, which was a big thing during this period as well. Many fish like Placoderms were born with jaws, but no actual teeth. Placoderms were armored fish and the first to develop pelvic fins. The pelvic fins allowed them to balance themselves and stayed level. Some fossils were found of them measuring

The carboniferous period lasted from about 359.2 to 299 million years ago, during the Paleozoic era. The name “carboniferous” came from the large amounts of carbon-bearing coal that was formed during the period. Several major biological, geological, and climatic events occurred at this time. The amniote egg allowed further exploitation for certain tetrapods. It enabled ancestors of birds, mammals, and reptiles to lay their eggs on land without fear of being dehydrated. The carboniferous period was divided into two major subdivisions, the Mississippian and the Pennsylvanian. The Mississippian was the early half and the Pennsylvanian being the last half.

Jurassic is a period of time with Dinosaurs, rodents and birds. There were also island seas consisting of sharks, sea monsters and blood-red planktons. The existing plants in that period were cycads, ferns and conifers. The Mesozoic era was about 245 million years ago to 65 years ago, so it almost lasted about 180 years in total. The Mesozoic era is divided into three periods of Triassic, Jurassic and Cretaceous. Mesozoic era means middle animals and it is the era, which the word’s fauna has changed from what is in the Paleozoic era and the most famous organisms of this era are dinosaurs. In the Mesozoic era, the extinction of more than 90 percent of species in the earth was observed and the reason behind it was mostly volcanic eruptions and climate changes. On the other hand, this era had massive changes that represented ecological niches and rise to new creatures such as rodent-size mammals and first dinosaurs. In Triassic, which was the first period of Mesozoic, the mammals and first dinosaurs existed. Later than that, the second period was Jurassic, which giant shaped dinosaurs and other kinds of dinosaurs were developed. Besides that the first flowering plants and primitive birds, with long teeth appeared in that era as well.