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 »

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 » History Prehistory

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 » Science Earth Science Landforms

The Stone Age began 2 to 3 million years ago and ended at around 3300 B.C. The dates for the beginning and end of the Stone Age are ranges because the definition of the age refers to the tools which were developed at dif... More »

The Cenozoic Era began about 65 million years ago and continues today. It is the third documented era in the history of the Earth. It is marked by the proliferation of mammals, birds, grasses and flowering plants. More »

Dinosaurs first walked the earth 230 million years ago and dominated the land for 160 million years. They became extinct 65 million years ago during the Cretaceous period. More »

The Mesozoic era began between 251 and 199.6 million years ago with the Triassic time period. Two other time periods belonging to this era are the Jurassic period, which began 199.6 to 145.5 million years ago, and the Cr... More » History Prehistory