Geokronologi: Forskelle mellem versioner
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==Se også==
*[[Kronostratigrafi]]
== Kilder ==
*Julia Jackson: ''Glossary of Geology'', 1987, American Geological Institute, ISBN 0-922152-34-9
*Brian J. Skinner & Stephen C. Porter, ''Physical Geology'', 1987, John Wiley & Sons, ISBN 0-471-05668-5
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