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Marine protozoa subject to silica replacement fossilization sound in limestone, shale and other rocks

Lines converging at a single center

Alpha, beta or gamma energy emitted by the decay of atomic nuclei from their radioactive source

A trace radioactive element, symbol, Ra. It occurs in uranium ores

Samples large enough to contain a similar percentage of mineral constituents of the host rocks from which it was removed

Rocks transformed by the replacement of eroded or precipitated minerals, by the introduction of newly deposited minerals and while retaining a high percentage of its original form

The time lapse between volcanic eruptions

Having the shape of a kidney

Another term for the shape of the earth surface at a specific point

The layer of rocks, gravel, sand, soil and other matter between surface and bedrock