American Heritage Dictionary
Century Dictionary
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
When they get to the pre-cambrian, they can stop: They have then found the truth, as recorded multiple times in the Grand Canyon area.— Science News / Features, Blog Entries, Column Entries, Issues, News Items and Book Reviews
Potsdam: Upper cambrian.— The Evolution of Man — Volume 2
Longmynd: Lower cambrian.— The Evolution of Man — Volume 2
Natural resources: shale oil (kukersite), peat, phosphorite, amber, cambrian blue clay, limestone, dolomite— The 1999 CIA Factbook
Estonia: shale oil (kukersite), peat, phosphorite, amber, cambrian blue clay, limestone, dolomite, arable land— The 2001 CIA World Factbook

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