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Published online by Cambridge University Press: 01 May 2009
Mr. Jukes-Browne's proposed classification of our rock groups, in the July Number of the Geological Magazine, is a commendable attempt to solve an important question, especially where he proposes to establish divisions on palæontological evidence, in preference to depending upon minor breaks in the succession, which must always be more or less local
page 359 note 1 It may be found advisable to class the Upper Palæozoic Rocks, like the Lower, into one system with three Primary divisions. In that case the term Devonian would be applied, in a better sense, as the lowest of the Primary Divisious in that system.
page 359 note 2 The term Silurian may possibly occur to some as suitable, but to my mind it seems entirely out of the question, as comparatively only a few of the groups,—none indeed of the more important of the lower groups,—occur anywhere within the limited area formerly occupied by the Silures.