An interim time-scale

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Abstract
Summary: The time-scale presented here endeavours to take cognisance of the views expressed in the Symposium, those expressed in other recent publications, notably the reviews and collations of Odin (1982) and Harland et al. (1982; based on Armstrong 1978), and the suggestions of the Subcommission on Precambrian Stratigraphy (Sims 1980). The conclusions of the contributors to these various works are not always compatible and this scale involves elements of both compromise and personal judgement. No plus or minus figures have been assigned to the boundaries although estimates of the uncertainty to be attached to the boundaries are commonly to be found in the more recent literature. It should be emphasized that these uncertainties are generally expressions of the limits within which a particular boundary probably lies according to the author concerned , they are thus apt to be somewhat subjective.