

Illinois State Geological Survey radiocarbon dates V.
Keywords
government agencies;Illinois;silt;survey organizations;Illinois State Geological Survey;caliche;vegetation;organic compounds;organic materials;United States;peat;organic residues;sediments;Cenozoic;charcoal;Quaternary;wood;clastic sediments;geochronology;C 14;carbon;dates;isotopes;radioactive isotopes;shells;absolute age;sedimentary rocks;carbonate rocks