Milne-Edwards and Haime.
(28) 'Polypiers Foss. des Terrains Paleozoiques.' Milne-Edwards
and Jules Haime.
(29) "Devonian Fossils of Canada West"--'Canadian Journal,' new ser.,
vols. iv.-vi. Billings.
(30) 'Palaeontology of New York,' vol. iv. James Hall.
(31) 'Thirteenth, Fifteenth, and Twenty-third Annual Reports on the
State Cabinet.' James Hall.
(32) 'Palaeozoic Fossils of Canada,' vol. ii. Billings.
(33) 'Reports on the Palaeontology of the Province of Ontario for 1874
and 1875.' Nicholson.
(34) "The Fossil Plants of the Devonian and Upper Silurian Formations
of Canada"--'Geol. Survey of Canada.' Dawson.
(35) 'Petrefacta Germaniae.' Goldfuss.
(36) 'Versteinerungen der Grauwacken-formation.' &c. Geinitz.
(37) 'Beitrag zur Palaeontologie des Thueringer-Waldes.' Richter and
Unger.
(38) 'Ueber die Placodermen der Devonischen System.' Pander.
(39) 'Die Gattungen der Fossilen Pflanzen.' Goeppert.
(40) 'Genera et Species Plantarum Fossilium.' Unger.
CHAPTER XII.
THE CARBONIFEROUS PERIOD.
Overlying the Devonian formation is the great and important series
of the _Carboniferous Rocks_, so called because workable beds
of coal are more commonly and more largely developed in this
formation than in any other. Workable coal-seams, however, occur
in various other formations (Jurassic, Cretaceous, Tertiary), so
that coal is not an exclusively Carboniferous product; whilst
even in the Coal-measures themselves the coal bears but a very
small proportion to the total thickness of strata, occurring
only in comparatively thin beds intercalated in a great series
of sandstones, shales, and other genuine aqueous sediments.
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