Of or pertaining to the country of the ancient Silures; -- a term applied to the earliest of the Paleozoic eras, and also to the strata of the era, because most plainly developed in that country.
The geological period between 436 and 415 million years ago.
A period of geological time, dating from about 440 to 420 million years ago.
A geological period; the third of the Paleozoic Era from 439 to 409Ma. The fossil record from this period includes a huge variety of marine fossils, land plants and early invertebrate land animals.Epochs:Prídolí 411-409Ma Ludlow 423-411Ma Wenlock 430-423M... More
Period of geologic time 395-430 million years ago.
The third of the six Geologic Periods of the Paleozoic Era. It extends from the end of the Ordovician Period (about 435 million years ago) to the beginning of the Devonian Period (about 395 million years ago).
A period of the Paleozoic Era, thought to have covered the span of time between 440 and 400 million years ago. This period of geologic history follows the Ordovician period and precedes the Devonian period.
from 425 million to 405 million years ago; first air-breathing animals
A geological time period from 408 to 439 million years ago.
a period of geologic time from 440 to 410 million years ago.
the third epoch of the Palaeozioc era, the last of the Lower Paleozoic, lasting for 40 million years during which fish firrst appeared in the Earth's oceans; named after the native British Silures tribe from South Wales, in whose former territories outcrops of these rocks appear.
The geological period between about 439 million years to about 409 million years ago.
A period of the Paleozoic, spanning the time between 440 and 410 million years ago. It is named after a Celtic tribe called the Silures.
(see Geological Timescale)
Geological period 440 – 395 million years ago.
the period of geological time between 440 and 410 million years ago. The name comes from the Silures, a tribe of Celts. See Geological Timescale.
Middle Paleozoic age ranging from 435 Ma to 410 Ma.
A geological era lasting from approximately 438 to 408 million years ago.
A period of time stretching from 443 to 417 million years ago. The fossil evidence preserved from this period indicates a rapid expansion of marine life, including trilobites and corals.
A geological period; the third of the Paleozoic Era from 443 to 416Ma. The fossil record from this period includes a huge variety of marine fossils, land plants and early invertebrate land animals. Epochs: PrÃdolÃ 418-416Ma Ludlow 422-418Ma Wenlock 428-422Ma Llandovery 443-428Ma
the thrid geological period of the Paleozoic era, after the Ordovician and before the Devonian, characterized by the development of early invertebrate land animals and land plants. The Silurian formerly included what is now Ordovician and what is now Silurian; the rocks formed during this period. [AHDOS
The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443.7 Â± 1.5 Ma (million years ago), to the beginning of the Devonian period, about 416.0 Â± 2.8 Ma (ICS 2004). As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by 5-10 million years. The base of the Silurian is set at a major extinction event when 60% of marine species were wiped out.
The name Silurians refers to a fictional race of reptile-like beings in the long-running British science fiction television series Doctor Who. The Silurians were Earth's first sentient species, were scientifically advanced, and lived during prehistoric times. At some point, the Moon approached close to Earth, threatening to cause geological upheaval, and the Silurians went into self-induced hibernation to survive.