The Triassic is a geologic period that extends from about 245 to 202 million years ago. As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events.
The characteristic sediments of the Triassic are red sandstones and evaporites, which suggest a warm dry climate. The...
The Jurassic period is a major unit of the geologic timescale that extends from about 200 Ma (million years ago) at the end of the Triassic to 146 Ma at the beginning of the Cretaceous.
The Jurassic constitutes the middle period of the Mesozoic era, also known as the Age of Dinosaurs. The start of the period is marked by the major Triassic-Jurassic extinction event.
During the ear...
The Miocene epoch is a period of time that extends from about 23 to 5.3 million year ago.
Of the modern geologic features, only the land bridge between South America and North America was absent.
During this period, mountain building took place in Western North America and Europe. Both continental and marine Miocene deposits are common worldwide with marine outcrops common near m...
The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443.7 million years ago, to the beginning of the Devonian period, about 416.0 million years ago.
During this period, the Earth entered a long warm greenhouse phase, and warm shallow seas covered much of the equatorial land masses. There is evidence that the Silurian icecap...
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