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Monastersky, Richard – Science News, 1992
Researchers who study the fossil record are seeking to determine whether the impact made by a comet or meteor really did decimate up to half of the life on this planet at the end of the Cretaceous period. Questions whether the extinction of plant and animal life was abrupt, started before the impact, or was a gradual change. (KR)
Descriptors: Archaeology, Evolution, Paleontology, Plants (Botany)
Badash, Lawrence – Scientific American, 1989
Summarizes the development of the Earth's age calculation including the work of Archbishop Ussher, James Hutton, Lord Kelvin, Ernest Rutherford, Bertram Boltwood, and Arthur Holmes. Describes the changes in radioisotope dating methods. (YP)
Descriptors: Evolution, Geology, Paleontology, Physics
