The Mesozoic Era

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.

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

The Cretaceous Period had a similar climate to the Jurassic, warm. The geography, however, was changed a drastic amount from the previous period. The Earth had very high sea levels at this time due to the lack of polar ice caps. The supercontinents Laurasia and Gondwana were breaking apart into the continents that are the same in the present day. Although the continents were the same, they did not yet look exactly the same. The continents will be further shaped by volcanic activity and tectonic plate activity. The shaping of the modern era was under way.

this mass extinction is what brought us the jurassic period, and from the Jurassic period, or the

According to a live science, an article written by Mary Bagley, "The Cretaceous Period was the last and longest segment of the Mesozoic Era. It lasted approximately 79 million years, from the minor extinction event that closed the Jurassic Period about 145.5 million years ago to the Cretaceous-Paleogene extinction event dated at 65.5 million years ago"(Mary Bagley, LS). In the cretaceous period, the continent of Pangea was still breaking away from itself, forming what we now know as the seven world continents. In the many eras of dinosaurs, the cretaceous era was responsible for evolving some, but not all the dinosaurs from full land dinosaurs to some who were able to live both on land and in water, semi-aquatic carnivorous dinosaurs. This era had produced some of the dinosaurs that maybe us non- paleontologist are more familiar with like the all mighty tyrannosaurus rex or the long neck. Well let me tell you, there were a lot more dinosaurs than just those two. Although the tyrannosaurs rex was an enormous dinosaur, a bigger dinosaur was discovered in 1912, the Spinosaurus. This discovery would change peoples, kids, and paleontologists view on which dinosaur was bigger than the other. This semi-aquatic dinosaur, Spinosaurus, was much larger than the T-rex due to its sail like backbones that stuck out of its back. Furthermore, spinosaurus had a huge advantage that the tyrannosaurus-rex did not.

The Cambrian era which can also be known as the Paleozoic era was a result of the period known as “Snowball Earth” that took place over 700 million years ago. The earth had frozen over for more than 200 million years, covering the entire surface with ice a mile long thick in length, killing off all species except for tiny micro organisms, but finally the ice layer on the earth exploded. The layer exploded from the volcanic activity deep beneath the icy surface, but when it finally did explode, it caused an eruption of an enormous amount of carbon dioxide, creating what they call a “green house” effect. Creating the water to become generously oxygenated for life to begin again on earth, but this time, only in the water.

The dinosaurs appeared after the greatest mass extinction event occurred. This is known as the Permian-Triassic extinction. It has been estimated to have occurred around two hundred and fifty million years ago. (6) It is also known as the Great Dying with over ninety percent of species dying off, leaving the Earth essentially a wasteland. It led to the extinction of “57% of all families, 83% of all genera and 90% to 96% of all species. 53% of marine families, 84% of marine genera, about 96% of all marine species and an estimated 70% of land species, including insects.”(7) By the late-Permian, global temperatures were very hot, with them being the highest ever on the planet.

Space scientists are attempting to comprehend which far-off worlds may have livable environments. To aid in this research a team has been studying the Earth past, “during the Archean era, one through half a billion years early ().” Earth atmosphere was unlike the present day Earth, possible because of different level of elements in the air. Astronomers find the Archean era Earth is the most unfamiliar world in their records. Haze in this world’s environment could play host to various elements, and block ultra violet radiation from the sun.

The Precambrian era does not have a previous era.But the era after the Precambrian was the Paleozoic. The Precambrian era was from 4.8 to 4.5 million years ago with the paleozoic era before it and then the Mesozoic era after. The time periods in the paleozoic era were Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Carboniferous, and Permian.The precambrian era did not have a previous Geologic era. The precambrian era had different periods which are Proterozoic, Archaean, and Hadean my major climate was the the ice age.my main geologic period was formation of earth and life for an example plants.The continents that the precambrian era had were pangia, animals that lived in the geologic era was waptia Dickinsonia protozoa

It is said during the Archean period, the temperature of Earth was higher than compared to during the Wopmay orogen tectonism. This was the case because of the heavy, widespread and firm crust of the Earth. Likewise the Cordillera found in modern day west part of Canada, orogeny has three structurally

The sixth and final period was the Permian Period during this period there was the biggest mast extinction to ever come. The climate went through extreme conditions. The supercontinent of Pangea had extreme cold weather the south was cold and dry and the majority of the area was covered in ice caps. The northern area dealt

Interval of geologic time lasting from approximately 66 million to 2.6 million years ago. It is the traditional name for the first two periods in the Cenozoic Era (66 million years ago to the present). The Tertiary has five principal subdivision, called epochs,which from oldest to youngest are the Paleocene (66 million to 55.8 million years ago), Eocene (55.8 million to 33.9 million years ago), Oligocene (33.9 million to 23 million years ago), Miocene (23 million to 5.3 million years ago), and Pliocene (5.3 million to 2.6 million years ago). During the Tertiary period, the compressional phase of intraplate tectonism transformed Texas west of the Pecos River into a dynamic landscape studded with scores of volcanoes. The peak of this volcanic

At the start of the Devonian Period, about 419.2 million years ago, our planet was undergoing major change. The union of the paleo-continents of Laurentia and Baltica (made up of what is now parts of modern day North America, northern Europe, Russia, and Greenland) occurred near the beginning of the Devonian Period and formed a supercontinent that straddled the Equator. That landmass has been called Laurussia, or Euramerica.

These techniques led to the discovery of the boundary between the two eras. A single thin layer of clay found within predominantly limestone rocks established this. By comparing the marine life found in, above, and below the clay, the marine life, like the dinosaurs, had been terribly affected by the extinction event. The percentage of life in the upper layers was dramatically lower than that in the lower. This was far more compelling than what was suggested by dinosaur’s fossils.