(22) 'Traite de Paleontologie Vegetale.' Schimper.
(23) 'Fossil Flora.' Lindley and Hutton.
(24) 'Histoire des Vegetaux Fossiles.' Brongniart.
(25) 'On Calamites and Calamodendron' (Monographs of the
Palaeontographical Society). Binney.
(26) 'On the Structure of Fossil Plants found in the Carboniferous
Strata' (Palaeontographical Society). Binney.
Also numerous memoirs by Huxley, Davidson, Martin Duncan, Professor
Young, John Young, R. Etheridge, jun., Baily, Carruthers, Dawson,
Binney, Williamson, Hooker, Jukes, Geikie, Rupert Jones, Salter,
and many other British and foreign observers.
CHAPTER XIV.
THE PERMIAN PERIOD.
The Permian formation closes the long series of the Palaeozoic
deposits, and may in some respects be considered as a kind of
appendix to the Carboniferous system, to which it cannot be compared
in importance, either as regards the actual bulk of its sediments
or the interest and variety of its life-record. Consisting, as
it does, largely of red rocks--sandstones and marls--for the
most part singularly destitute of organic remains, the Permian
rocks have been regarded as a lacustrine or fluviatile deposit;
but the presence of well-developed limestones with indubitable
marine remains entirely negatives this view. It is, however,
not improbable that we are presented in the Permian formation,
as known to us at present, with a series of sediments laid down
in inland seas of great extent, due to the subsidence over large
areas of the vast land-surfaces of the Coal-measures.
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