The Permian-Triassic Extinction

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 cretaceous-tertiary (KT) boundary extinction happened approximately sixty five million years ago. Sixty to eighty percent of all living species became extinct at this boundary (Raup 1988). The KT extinction was indeed a mass extinction event. Mass extinctions are periods in Earth's history when extremely large numbers of species die out simultaneously or within a limited time frame. The most severe mass extinction ever occurred at the end of the Permian period when 96% of all species died out. The K-T mass extinction obliterated almost all the large vertebrates on Earth, on land, at sea, and in the air (all dinosaurs, plesiosaurs, mosasaurs, and pterosaurs) suddenly became extinct at the end of the Cretaceous Period. At the same time, most

Around 250 million years ago, dinosaurs were the premiers of the Earth. A few questions are posed when looking at the dinosaurs. What is classified as a dinosaur? How did dinosaurs come to rule? Did the same dinosaurs live for all 150 million years they were here? Where did they all go? Taking a look at the evidence, all the answers to these questions are there. Maybe even more questions can be posed from the answers to the ones above.

There have been 5 mass extinctions in Earth’s existence. The names of these are (from most recent to least recent): Cretaceous–Paleogene, Triassic–Jurassic, Permian–Triassic, Late Devonian, and Ordovician–Silurian. The most well known mass extinction, Cretaceous-Paleogene, was theorized to have occurred through a massive comet or asteroid impact. A cold winter created by the impacting object forbid any plants and plankton to carry out photosynthesis. During this time, about three quarters of all life went extinct. This happened approximately 66 million years ago. Most life forms went extinct, with some ectothermic species and tetrapods weighing less than 25 pounds. Although everything seemed to look hopeless, adaptive radiation caused evolution

It took at least 10 million years for life to recover to pre-event levels. If catastrophe hadn't struck, I could have been a super-intelligent Pentecopterus, writing this article right now, about how my species wiped out the dim-witted Jaekelopterus 252 million years ago with cunning technological

The earliest of the Big Five, the end-Ordovician or Ordovician-Silurian extinction events some 444 million years ago, are reckoned by many to be the second largest.

The second mass extinction happened to sea creatures once again. Somewhere between 375-360 million years ago, fluctuations of the sea levels in the ocean caused a large portion of Earth’s species to disappear. Another cause would be the changes in climate change, asteroid strikes, or new land plants. Some theories suggest that oxygen depletions in shallow waters caused the Devonian Extinction. Other theories say that algae

The Triassic Period was the first period of the Mesozoic Era. A lot happened to Earth and its life-forms during the Triassic but the most celebrated event was the evolution of dinosaurs. The Triassic Period was the first period of the Mesozoic Era, and ran from 248 to 200 million years ago.Scientists first began studying dinosaurs during the 1820s, when they discovered the bones of a large land reptile buried in the English countryside. In 1842, Sir Richard Owen, first made the term “dinosaur.” Owen had examined bones from three different creatures. Each of them lived on land, was larger than any living reptile, walked with their legs directly beneath their bodies instead of out to the sides and had three more vertebrae in their hips than other known

The Mesozoic Era contains three geologic time periods including the Triassic Period ,from 252 million to 200 million years ago. The Triassic period was named in 1834 by the German geologist Friedrich August Von Alberti (1795-1878). It was originally named the "Trias". It got its name because this period of geologic time is represented by a three-part division of rock types in Germany . It began 252 million years ago, at the close of the Permian Period, and ended 201 million years ago. Jurassic Period, from about 200 million to 145 million years ago. During the Jurassic Period, the supercontinent Pangaea split apart. The Jurassic was a golden age for the large herbivorous dinosaurs known as the sauropods—Camarasaurus, Apatosaurus, Diplodocus,

billion years ago Earth was totally hostile to any life and multi-cell life that only

Dinosaur extinction could arguably be the most important event that contributed to world history. Without the extinction of dinosaurs, the human race would not exist let alone world history. These beautiful creatures appeared during the Triassic period about 231.4 million years ago. These creatures lived everywhere in the world including Antarctica. During the Triassic period all of the continents were morphed together into one called the Pangaea making travel a lot easier. Since the climate was different Antarctica had forest and was able to inhabit life. The dinosaurs disappeared at the end of the cretaceous period about 65 million years ago to an unknown source.

In the history of the earth there have been five known mass extinctions (9, 12). The destruction of the dinosaurs is called the Cretaceous Tertiary extinction, also known as the K-T extinction (12). The extinction of the K-T happened 65.5 million years ago (9), caused by a huge meteorite hitting the Earth (12) and causing dust to block the sun (9, 12). Without sunlight, it became cold and food was scarce. Approximately 200 million years ago, the Triassic-Jurassic extinction occurred (9, 12). Grand scale of volcanic activity was the cause (12), which resulted in lava burning the organisms, environmental destruction, and food scarce. The Permian-Triassic extinction occurred 205 million years ago; also affected by volcanic activity (12). The result

Triassic Period, The Triassic period was the first-time period of the Mesozoic era. This period occurred between 251 to 199 Million years ago. This was the period of diversification of the earth's ecology especially the marine creatures. Triassic Period is often known as the age of reptiles because there were a group of animals and plants that were extinct the Permian Extinction: One called the Therapsids, which were mammal-like reptiles, spiders, millipedes, scorpion, and centipedes but there was a new insect group of the Triassic period was the grasshoppers. Mosses and fern survived in the coastal regions you could find Lycopodiopsid, Puzzlegrass, Conifers, Cycad plants. Geologists said this period began and end when the large extinction

“Maybe a torrid climate dried up the available sources of water, some say. Maybe it was lava that covered the land, poisoned the air, and brought on an ice age. Maybe too many early mammals dined on too many dino eggs, or the meat-eating dinosaurs ate up all the vegetarian ones. Maybe the need to find water led to massive migrations that spread diseases. Maybe the real problem was a reconfiguration of land masses, caused by tectonic shifts” ( DeGrasse Tyson, Neil. "Knock 'Em Dead." Alabama Virtual Library. N.p., n.d. Web. 15 Nov. 2016.). Father-and-son scientists Luis and Walter Alvarez discovered a distinct layer of iridium that corresponds to the precise time the dinosaurs died. With this information it suggests that a comet, asteroid or meteor impact could be the cause of the extinction of

Such extinctions and adventures have left people like me confused. How much did the earth loose in such a short period of time?