Definitions for "Devonian Period"
Keywords:  phanerozoic, eon, geologic, ago, balech
A geologic period in the Phanerozoic Eon (410 to 360 Mya). diameter - With the exception of the Prorocentroids, the maximum cell width measured between the lateral extremes of the cingular flanges (Balech 1995).
A geological period of the Phanerozoic Eon of Earth's history, extending from 410 to 360 Ma ago.
from 405 million to 345 million years ago; dominance of fishes and appearance of amphibians and ammonites