The Maclurites genus of gastropods lived during the Paleozoic era, particularly during the Silurian and Devonian periods, approximately 419 to 359 million years ago. They were marine organisms that had cone-shaped shells.
gastropod snail
I think it is one year :P
require a long period of time to form
about 1.9 billion years ago.
Roman Imperialism is a term that was defined in later times than the Roman Empire and it best describes the tendency of the Romans to extend the authority of their state [Imperium Romano] to all neighbour countries/ regions or territories in the same way that all empires did in the past - Sumerian, Assyrian, Babylonian, Persian, Roman, Byzantine, Ottoman, Spanish, Portugese, French, British; currently USA [President G W Bush: who is not with us is against us] and god knows who the next will be.
Something Is Considered Medival When It Came Form The Medival Time Period.
Usually in the time period April to June of the year.
No, it is not. It is a noun usually meaning a short period of time (with the adjective form momentary).
The Jurassic Period followed the Triassic.
Sea stacks form over a long period of time—thousands or even millions of years.
Granite does not come from any particular time period. Nor does any kind of rock. Most granites, though, are quite old, though, as it takes time for them to form and then be exposed.
metamorphisis or evolution. evolution is the period of time in which a living organism slowly changes.