The Permian-Triassic Period

The Jurassic Period was the second half of the Mesozoic Era. It took place around 199.6 to 146.5 million years ago, following after the Triassic period and before the Cretaceous period. During this time period, the supercontinent known as Pangaea broke apart. The Northern half, called Laurentia and would later part into North America and Eurasia, was starting to split. The tearing of this part of the continent also started to make way for water passages that would soon be known as the Gulf of Mexico and the Atlantic ocean. Meanwhile, the southern half, Gondwana, started to drift in a more eastern direction, slowly pulling apart in order to begin the creation of Antarctica, Madagascar, India and Australia. A more western portion of Gondwana

For the time compass enveloping vertebrate advancement, there are three periods: the Paleozoic, the Mesozoic and the Cenozoic. The very effective mammalian versatile radiation is altogether inside the latest period of topographical history, the Cenozoic. There are seven ages in the Cenozoic - Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene and Holocene. In Paleocene (65 m.y.a.), the Lemuroids were the gathering of primates that existed. The Ruffed Lemur began in the tropical rainforests of Madagascar.

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

In addition to carnivore and herbivore mammals, there were also many different species of birds and reptiles that existed. A common misconception is that dinosaurs lived during this time, but they had gone extinct some 60 million years before the Pleistocene began. Some species of

Tertiary is the third era. “During the Tertiary period placement of the continents were different than were they are located today.” “There were only the Pacific Ocean, Atlantic Ocean, and the Indian Ocean.” “ Continents were North America, Greenland, northern Europe, Asia, and Iberia.” Climate change from the beginning to end was very significant. “During the beginning the earth was warm and moist compared to the weather now.” By the middle of the period earth started to cool. This was cause by volcanoes that kept giving off carbon dioxide.” After a while by the end of this period it was so cold that the last ice age had started.” “However this had to be the most important time period for mammals.” “The time period before Tertiary which was the Cretaceous period.” “The Cretaceous period ended with the extinction of dinosaurs, large reptiles, and many different others.” “After all the extinction of the other animals mammals became the dominant species on Earth.” “This is why the Tertiary Period is called the age of mammals.” “There are to unusual mammals that we have researched on from this period that were

The end-Triassic or Triassic-Jurassic extinction event occurred around 200 million years ago is and thought by numerous have helped dinosaurs to be the dominant species on earth for 135 million years. It additionally finished life for generally 50% of all species that were available around then. Until this event, mammal like animals known as therapsids were much more than the ancestors of the dinosaurs, known as archosaurs. The dinosaurs survived better compared to the early proto-vertebrates, and this extinction event may have altogether tipped it to support them clarifies #########. Of the Big Five, the Triassic-Jurassic extinction event has the least number of current researches. Its cause stays under debate,

dinosaur age to the Cretaceous period, to the world we are living in today, where global warming

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.

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.

Towards the center of the period the atmosphere ended up hotter and milder, the ice sheets subsided, and the mainland insides wound up drier. A significant part of the inside of Pangea was presumably bone-dry, with incredible regular vacillations (wet and dry seasons), due to absence of the directing impact of close-by waterways. This drying inclination proceeded through to the late Permian, alongside substituting warming and cooling

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 late Devonian extinction events were actually two sharp pulses of death about 360 million years ago, each just 100,000 to 300,000 years apart. Each pulse was accompanied by a massive drop in temperature, with the steaming seas of the Devonian—surface temperatures of which were about 93 degrees F (34 degrees C)—dropping to about 78 degrees F (26 degrees C), "and marine organisms would not have liked that at all," McGhee said. As to what caused these cold snaps, the ever-popular suspects are ash and dust kicked up by either astronomical impacts or massive volcanism. At that time, plants had made it onto land, as had spiders, scorpions and similar creatures. Right before the extinction events, the first proto-amphibians

The Mesozoic Era was from 248 mya to 65mya. The previous era was Paleozoic and the era after was Cenozoic. The cretaceous period: Upper 96-65 mya, high tectonic and volcanic activity. Primitive marsupials develop. Continents have a modern day look. Minor extinction 82 mya. Ended with large extinction, lower 146-98 the heyday of the dinosaurs. First crocodiles and feathered dinosaurs appear. Jurassic: 208-146 many dinosaurs there's, sauropods,Archaeopteryx, flowering plants,Ammonites, pterosaurs.Triassic: 248-208 mya first dinosaurs appear, mammals, and crocodile forms appear. True flies appear. The temperature in both land and water were much higher than during the Paleozoic period. Climates were more tropical in nature. There were desserts

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.

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