Abstract
I HAVE read with interest Prof. Coleman's timely reminder, in NATURE of June 17, p. 775, of the essentially intrusive relations of the Archæan and of the frequently made deduction that the oldest visible rocks of the earth's surface are sedimentary. Of course this deduction is perfectly sound, provided the age of an intrusive rock is taken, as has been the custom, to be that of its intrusion. We are entitled, however, to consider the previous history of the material composing these intrusive Archæan masses, and, in view of their predominantly banded structure, which marks them off as in some way different from later intrusive masses of similar composition, such consideration seems forced upon us.
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WRIGHT, W. Geology and the Nebular Theory. Nature 110, 76–77 (1922). https://doi.org/10.1038/110076c0
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DOI: https://doi.org/10.1038/110076c0
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