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Published online by Cambridge University Press: 14 March 2018
Rocks composed mainly of the hydrated ferrous silicate greenalite are of very restricted geological and geographical distribution and, up to the present, have been recognized only from certain of the pre-Cambrian sedimentary iron-bearing formations of the Lake Superior region. It is of interest, therefore, to record an additional occurrence, not only from another region but from a later geological system.
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page 435 note 1 Jolliffe, F., loc. cit., 1935, p. 410.Google Scholar
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