adj of, belonging to, or designating the oldest and largest division of geologic time, preceding the Cambrian, often subdivided into the Archeozoic and Proterozoic eras, and marked by the appearance of primitive forms of life
In this Eon the creation of the solar system occurred, around 5 billion years ago then the planets formed and earth began its long great life! The first single-celled organisms appeared around 70 to 1 billion years ago Toward the latter part of the Precambrian Eon jellyfish, primitive arthropods, and sponges diversified
The earliest part of the geological time scale, including all corresponding rocks, equivalent to about 90 percent of geologic time; from the beginning of time until the beginning of the Paleozoic, about 600 million years ago
An era in the geologic time scale that began with the creation of the Earth (4 5 billion years ago) and spans to about 570 million years before the present
The ancient epoch of geological time (3 5 billion to 600 million years ago), marked in the North Country by the Early Precambrian Keewatin, Laurentian, Knife Lake, and Algoman periods (3 5 to 2 7 billion years ago); the Middle Precambrian Early, Middle, and Late Huronian(Animikean) periods (2 6 to 1 6 billion years ago); and the Late Precambrian Early, Middle, and Late Keweenawan periods (1 6 billion to 600 million years ago)