Report of the Committee on the Measurement of Geologic TimeNational research council, 19, 1943 - Geological time |
Contents
Summary Report of the Committee on the Measurement of Geologic | 1 |
Summary Report of the Committee on the Measurement | 2 |
B Stratigraphically Dated Lavas for Radioactive | 22 |
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Abstract of paper activity age determinations age measurements Ahrens allanite amounts Anal analyses appears atomic weight Bibliography Bull C. R. Acad calculated Canada carnotite Chairman Chem chemical Committee concentration cosmic counting crystals decay deposits described discussion Exhibit field formation further geochemical Geol geologic age Geophysical given granite heat helium Holmes Inst interest isotope isotope ratios isotopic composition John Putnam Marble Keevil lead lepidolite localities magnetite material Measurement of Geologic meteorites method Mineralogist monazite neutron Nier nuclear original particles pegmatites Phys pitchblende Pleistocene pollucite possible potassium preCambrian present probably quantities Ra content radioactive content radioactive decay radioactive elements radioactive minerals radiogenic radium rare earth rare earth oxides recent region Report rubidium samarskite samples sedimentary sediments separation shales specimens spectrographic strontium studies thorium types uraninite uranium Urry variation various varves workers zircon