The earth had been by no means all swamp in the Carboniferous age.
"The Story of Evolution" by Joseph McCabe
I should say that it was in the Carboniferous age.
"The Skylark of Space" by Edward Elmer Smith and Lee Hawkins Garby
Smooth boles ascended inconceivably toward a brightening sky, trees bizarre as the forests of the Carboniferous age.
"Pygmalion's Spectacles" by Stanley Grauman Weinbaum
The high-grade coals of the eastern and central United States are found in rocks of Carboniferous age.
"The Economic Aspect of Geology" by C. K. Leith
Cinto; but between the Gulfs of Porto and Galeria, schists, limestones and anthracite, containing fossils of Upper Carboniferous age, occur.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 4" by Various
The Western coal-fields belong to the period following the Carboniferous Age.
"Earth and Sky Every Child Should Know" by Julia Ellen Rogers
A large part of N. Devon is occupied by the Culm shales, limestones and grits of Carboniferous age.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 4" by Various
During the carboniferous age the earth was a great hotbed.
"Nature's Miracles, Volume 1" by Elisha Gray
The Palaeozoic beds have yielded fossils of Cambrian, Ordovician, Devonian and Carboniferous age.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 2" by Various
Mostly large forms, of Carboniferous and Permian age, with a more or less complex infolding of the walls of the teeth.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 4" by Various