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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 »

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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 »

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 »

Historians believe fire first appeared in the world approximately 1 million years ago when inhabitants of Africa created fires for cooking food. The use of fires remained within the confines of Africa's borders for appro... More »

The first occurrence of simple animals was approximately 600 million years ago. These were characterized as multi-cellular organisms with basic structures, but no true tissues. An example would be a jellyfish or marine s... More »