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Geological Society, London, Special Publications; 1964; v. 1; p. 73-86;
DOI: 10.1144/GSL.SP.1964.001.01.09
© 1964 Geological Society of London

Part 2: Radiometric Methods with Respect to the Time-Scale

Uranium–thorium–lead age-determinations with respect to the phanerozoic time-scale

A. G. Darnley, M.A., PH.D., A.M.I.M.M., F.G.S.

Geological Survey of Great Britain, Atomic Energy Division, Young Street, London, W.8

Topics discussed in this short review are: the physical basis of the method, common lead ages, calculation of results, the significance of discordant results, and the selection of material for analysis. It is stressed that all aspects of the geology of an area, including its mineralogy and geochemistry, must be studied before age-determinations on material can be properly evaluated.