carboniferous

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

From carbon + -i- + -ferous.

It is too low to be in the Carboniferous." — The Bishop of Cottontown: A Story of the Southern Cotton Mills, John Trotwood Moore
In the Carboniferous map the whole globe--ocean floor and rifted land mass alike--bore symbols of the Old Ones' vast stone cities, but in the later charts the gradual recession toward the antarctic became very plain. — At the mountains of madness, H. P. (Howard Phillips) Lovecraft
It is a narrow plain of Carboniferous and Triassic marls, shales, sandstones, and conglomerates, abounding in fossils, the most arid part of Arizona; even the river's lower reaches dry up for a part of each year. — The Book of the National Parks, Robert Sterling Yard

Carboniferous period

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