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Updated: September 13, 2025
Most of them are water creatures, though there are a few that can live on land and in the water, too, and in the latter part of the coal-making period enormous reptiles crawled over the wet floor of the forest.
Although coal-beds are by no means peculiar to the Carboniferous period, since such deposits must be formed wherever the decay of vegetation is going on extensively, yet it would seem that coal-making was the great work in that age of the world's physical history. The atmospheric conditions, so far as we can understand them, were then especially favorable to this result.
As such beds of limestone could have formed only in the ocean, their presence throws a good deal of light upon the geography of those distant times. Upon the Pacific slope the marshes were not so extensive, nor did they last for so long a period, as those in the East. Nature seems to have confined her strongest efforts at coal-making to the country east of the Rocky Mountains.
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