Geological Age: the Extreme Antiquity of Pegmatites from Manitoba

An inspection of the available data on geological ages determined by the lead method shows that in two areas the pegmatite ages appear to be considerably greater than those of any other Pre-Cambrian pegmatites so far determined. These two areas are located in northern Karelia and south-east Manitoba...

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Veröffentlicht in:	Nature (London) 1947-12, Vol.160 (4077), p.874-875
1. Verfasser:	AHRENS, L. H
Format:	Artikel
Sprache:	eng
Schlagworte:	Humanities and Social Sciences letter multidisciplinary Science Science (multidisciplinary)
Online-Zugang:	Volltext
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