The Old Stone Age is also known as the Paleolithic Era and began at the dawn of human existence, about 2.5 million years ago, until 12,000 years ago. The New Stone Age is also called the Neolithic Era and lasted from abo... More »

The period of time commonly referred to as the Stone Age, or more specifically the "Old" or "Early" Stone Age, began with the first emergence of human beings and ended about 12,000 years ago. The descriptive term "Stone ... More »

During the long Neolithic period, from 6800 to 3200 B.C., shelters were built using thick timber posts, clay and stone for the foundation and walls, while roofs were made from tree trunks, clay and hay. Other characteris... More »

The era occurring before the current geologic era was the Mesozoic, which began roughly 245 million years ago and ended about 64 million years ago. The Mesozoic era consisted of three periods; from oldest to more recent,... More »

Australopithecus Africanus lived during the late Pliocene and early Pleistocene epochs, about 3.3 to 2.1 million years ago. Thought to be a direct ancestor of modern humans, these early hominids possessed a combination o... More »

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The Paleozoic Era, which marked the appearance of almost all animal phyla within a few million years, was ended by a mass extinction. The mass extinction was the virtual opposite of what started the era, with over 90 per... More »

The Paleozoic Era saw changes to Earth's landscapes, life forms and atmosphere over the course of several million years. On land, at sea, below the surface and in the skies, change occurred throughout the six distinct pe... More »