WordNet
n. a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods" [syn: period]
Usage examples of "geological period".
The belemnites had given way to their squidlike cousins-but the geological period in which belemnites had existed in the absence of ammonites was restricted.
When I found in La Plata [Argentina] the tooth of a horse embedded with the remains of Mastodon, Megatherium, Toxodon, and other extinct monsters, which all co-existed at a very late geological period, I was filled with astonishment.
But we have good evidence in almost every case, that the epoch was included within the latest geological period.
Tambora was the greatest ash eruption of the current geological period.
It was everywhere the same: savagely tropical, in the throes of a geological period roughly comparable to Earth's Carboniferous Era, Plainly, the only habitable planet would be nothing but a way station.
So then, the origin of coal mines, in whatever part of the globe they have been discovered, is this: the absorption through the terrestrial crust of the great forests of the geological period.
The belemnites had given way to their squidlike cousins - but the geological period in which belemnites had existed in the absence of ammonites was restricted.
But upon investigation we find, that not only are the whales of the present day superior in magnitude to those whose fossil remains are found in the Tertiary system (embracing a distinct geological period prior to man), but of the whales found in that Tertiary system, those belonging to its latter formations exceed in size those of its earlier ones.
It was everywhere the same: savagely tropical, in the throes of a geological period roughly comparable to Earth’.
It was everywhere the same: savagely tropical, in the throes of a geological period roughly comparable to Earth's Carboniferous era.
The crystals were skeletal remains of a creature belonging to an early geological period when there still had been water on Mannafra.
It is of our own geological period, but it is simply from a path in time in which Rio de Janeiro never happened to be built.