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Index fossil: A fossil that identifies and dates the strata in which it is typically found.

The term Ediacaran was replaced for a while by Vendian, but now it seems that Ediacaran is back in fashion.

With most earlier periods, epoches are often equivalent to the Early, Middle, and Late part of the period.

Fission: The spontaneous or induced splitting, by particle collision, of a heavy atomic nucleus into a pair of fragments plus some neutrons.

During the time the planet was formed, but conditions were unsuitable for life. ; A sample of ice taken from glaciers or other accumulations, often showing seasonal layering.

[den., science] Ice cores can be dated by multiple independent means, with the oldest published date of 140,000 ± 15,000 years for the Vostok core from Antarctica. The other two types of rock are sedimentary, formed by the cementing together of soil or sand, and metamorphic rocks reformed by heat over long periods of time.

Element: A substance, made up of atoms, that cannot be further subdivided by chemical means.

It has a certain number of protons in the nucleus and unique properties.A fossil may be a bone, shell, leaf impression, footprint, insect in amber, etc.Geologic(al) column: The arrangement of rock units in chronological order from the youngest (at the top) to the oldest (at the bottom).Mammals and birds are the dominant vertebrates on land, teleost fish in the sea, and angiosperms (flowering plants) and in certain areas conifers the predominant form of plant life.more Closed system: A system (rock, planet, etc.) which has no influence or exchange with the outside world.An atom may share electrons with an adjacent atom or atoms; the result being a molecule.