geological period

DEFINITIONS OF: geological period

“ganoid fishes swarmed during the earlier geological periods”

Examples:: show 13 examples...; hide 13 examples...; Quaternary period
last 2 million years; Tertiary period
from 63 million to 2 million years ago; Cretaceous period
from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants; Jurassic period
from 190 million to 135 million years ago; dinosaurs; conifers; Triassic period
from 230 million to 190 million years ago; dinosaurs, marine reptiles; volcanic activity; Permian period
from 280 million to 230 million years ago; reptiles; Carboniferous period
from 345 million to 280 million years ago; Upper Carboniferous period
from 310 million to 280 million years ago; warm climate; swampy land; Lower Carboniferous period
from 345 million to 310 million years ago; increase of land areas; primitive ammonites; winged insects; Devonian period
from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites; Silurian period
from 425 million to 405 million years ago; first air-breathing animals; Ordovician period
from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds; Cambrian period
from 544 million to about 500 million years ago; marine invertebrates

Types:: glacial epoch, glacial period, ice age
any period of time during which glaciers covered a large part of the earth's surface

Type of:: geologic time, geological time
the time of the physical formation and development of the earth (especially prior to human history)

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