ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] THE development of modern techniques of isotopic age determination makes possible an absolute definition of the geological time-scale. The scale in common use was constructed by Holmes1 2 and placed the beginning of the Upper Cambrian at 450 million years ago. He was handicapped, however, by ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/185495a0
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