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The Triassic Period of Earth's geologic history occurred from 250 million years to 200 million years ago as the first part of the Mesozoic Era. The Triassic was the first stage after the Permian extinction, an event that... More »

www.reference.com Science Earth Science

The Triassic period began approximately 248 million years ago and ended 206 million years ago; although, some sources date it to be between 251 and 199 million years ago. It was followed by the Jurassic period; it was th... More »

www.reference.com History Prehistory

According to the Encyclopedia Britannica, the Triassic period was named after three rock layers found in central Germany that laid above the Permian layer and below the Jurassic layer. The original name "Trias" was later... More »

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At the beginning of the Triassic Period, all of the major landmasses of the Earth were still joined in a single supercontinent now known as Pangaea. This landmass began to break up through the middle period of the Triass... More »

www.reference.com Science Earth Science Landforms

The Quaternary Period includes the most recent 2.6 million years of the geologic time scale and is the time period in which humans first appeared. During the Quaternary Period, 30 percent of Earth's surface was covered b... More »

www.reference.com Science Earth Science

The Triassic period began approximately 248 million years ago and ended 206 million years ago; although, some sources date it to be between 251 and 199 million years ago. It was followed by the Jurassic period; it was th... More »

www.reference.com History Prehistory

While no one knows for certain how the Earth formed, scientists theorize that it formed over 4 million years ago after the sun went through its initial formation, gravity began to draw heavy particles together into a pla... More »

www.reference.com Science Earth Science