It is true that the Carboniferous is known as "The Age of Swamps" and coals.
The Carboniferous Period is well-known for its vast swamp forests.
These swamps produced the coal that gave rise to the term Carboniferous, or "carbon-bearing." During the late Paleozoic Era, the Carboniferous Period lasted from 359.2 to 299 million years ago*.
The Carboniferous period is often referred to as "the age of swamps and coal." Swamps and seas covered much of the land during this time period.
Thus, the given statement is true.
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