Transcript Triassic period - Digging-Up-The-Past
Trissic period Ethan guest Environment • 251 mya to 199 mya. • The start of the Triassic period (and the Mesozoic era) was a desolate time in Earth's history. Something—a bout of violent volcanic eruptions, climate change. • perhaps a fatal run-in with a comet or asteroid—had triggered the extinction of more than 90 percent of Earth's species. Land • The Triassic period was a transition from the Paleozoic Era to the Mesozoic. It is situated between the end of the permian period and the beginning of the Jurassic, lasting from 254 mya to 206 mya. • . As with almost any other period of the Earth's history, the Triassic had a unique climate and biota indigenous to that time. The paleoclimate was influenced largely by tectonic events that never existed before or since. weather • The Triassic Period (250-108 million years ago): In Triassic times, all of the earth's continents were joined together into a vast landmass called Pangaea vegetation • • The Triassic period (248 - 206 million years ago). the Triassic Period followed the biggest mass extinction in the history of the Earth, the Permian extinction. • This left the Earth relatively unpoplated (especially the seas) and ready for new life. • Jurassic Period Ethan guest Environment • Pangaea started to break apart during the Jurassic Period. The Atlantic Ocean opened to the west of Britain and the Americas drifted away from Europe. The Earth was relatively warm, sea levels were high and there were hardly any polar ice caps. Land • The giant continent Pangaea broke up into two landmasses known as Laurasia (in the north) and Gondwanaland (in the south). The budding Atlantic Ocean started to separate Eurasia and North America. Weather • Jurassic climate stayed warm and became more humid. The polar areas were ice-free during this Period. vegetation • The rainfall on the lands was sufficient to support luxuriant vegetation. There were no ice-caps, and the seas were very warm and clear. Over wide areas old land areas were covered by shallow water. Cretatious period Ethan Guest Environment • The world during the Cretaceous looked very different. Its continental arrangement was different, as was the 'flora and fauna' that survived in a very different climate. Land • During the Late Cretaceous, land and seas continued to change and move. The climate of the world changed toward cooler and more seasonal weather. New types of plants and animals were appearing. Weather • There was a major change in the climate in the Cretaceous Period. During the Cretaceous Period the weather was very warm. It was considered "tropical." At around the ending of the Cretaceous Period, however, the temperature dropped making the climate very cold. Vegetation • The main innovation of the Cretaceous was the evolution of flowering plants, which spread across the separating continents, along with thick forests and other kinds of dense, matted vegetation. Dinosaur Extinction • Well some people believe that there are two ways that dinosaurs got extinct the first reason is because the great flood the time when Noah built the ark and the massive earthquake. There was no sun it was just pitch black. There was no air for them to breathe in. so no one really knows what happened.