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Cambrian Period
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Cambrian paleogeography A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years. Cambrian paleogeography trilobite trilobite Illustration of Anomalocaris canadensis, a soft-bodied Cambrian predator, showing its elongated segmented body, large frontal appendages, circular mouth, and prominent eyes, with a simplified top view inset. breccia A chart showing the Cambrian period within the Paleozoic era on the geologic time scale, listing its epochs, stages, and corresponding ages in millions of years ago, with color-coded divisions and notes on boundary definitions. trilobite fossil Geochronology. Table 5: Subdivisions of the Cambrian System.
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Cambrian paleogeography
Cambrian paleogeography Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the late Cambrian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.

Cambrian Period

geochronology
Written by
Rex E. Crick
Professor of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, Texas.
Rex E. CrickAll
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•History

Cambrian Period, earliest time division of the Paleozoic Era, extending from 538.8 million to about 485.9 million years ago. The Cambrian Period is divided into four stratigraphic series: the Terreneuvian Series (538.8 million to 521 million years ago), Series 2 (521 million to 506.5 million years ago), the Miaolingian Series—formerly Series 3—(506.5 million to 497 million years ago), and the Furongian Series (497 million to about 485.9 million years ago). Rocks formed or deposited during...

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