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INSIDE YAHOO! Join a Chat Post a Message Headline News CATEGORIES Permian Period (2) Carboniferous Period (5) Devonian Period (7) Silurian Period (4) Ordovician Period (3) Cambrian Period (11) Trilobites@ SITE LISTINGS Alphabetical  |  By Popularity    (What's This?) GONIAT: Paleozoic Ammonoid Database System - Designed as a tool for investigations of the Paleozoic ammonoids, their paleogeographic distribution, and their biostratigraphic range. Paleozoic Era - Addresses the stratigraphy, ancient life, tectonics, and localities of formations and outcroppings. Paleozoic Era: The Age of Ancient Life - Comprised of six periods, it lasted from 570 to 250 million years ago. Paleozoic Extinctions - Highlights the major episodes, describes the geological settings, and lists the primary species affected.

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Directory > Science > Earth Sciences > Geology and Geophysics > Geologic Time > Paleozoic Era

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