Abstract
Abstract One of six galena samples from the Pilbara of Western Australia, located in a ‘greenstone’ sequence, appears from its lead‐isotope ratios to be of great age. ‘Linear Model III’ ages of Cumming & Richards (1975) agree with available geological evidence for this, and for one other younger sample located in the Shaw Batholith. Two of the other samples, also from Archaean granitic host rock, appear to be significantly younger than the host; the other two, from within the Lower Proterozoic Fortescue Group, suggest that its age is not yet well known. Previously‐published age information has been adapted to the newly‐accepted values for the decay constants throughout this discussion.
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