See E. F. Zeuner, Dating the Past (4th ed. 1970); R. H. Dott and R. L. Batten, Evolution of the Earth (1988); M. J. Aitken, Science-based Dating in Archaeology (1990); W. B. Harland et al., A Geologic Time Scale 1989 (1990).
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.