Report of the Committee on the Measurement of Geologic Time
National research council, 19, 1952 - Geological time
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Abstract acid allanite Alter ammonia ammonium amount analysis anhydrite apparently atomic weight average beds bottom Bull carbonate changes Chem color committee complete concentrated consists contain cool core crucible crystal cycles deposits described determination dilute discussion dissolve evaporate Exhibit filter filtrate final follows formation forms Geol geologic given gives haloes Hecht helium ignite Includes indicate isotopes Kroupa Lake laminae Lane layers lead less locality Marble material measurements method Michigan million minerals minutes Nature nearly non-glacial varves obtained organic matter Phys pitchblende Pleistocene possible precipitate present probably production radioact radium ratio recent remove residue rocks salt sample sediments seems separation solution steambath studies suggested thick thorium tion uraninite uranium variation varves volume warm wash Washington weight zone