{i} third geologic period of the Paleozoic Era during which the first animal and land plants that breath air appeared (Geology)
{s} of or pertaining to the Silures; of or pertaining to or being the third period of the Paleozoic Era (Geology)
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
Interval of geologic time, 443-417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were distributed as follows: Arctic Canada, Scandinavia, and Australia were probably in the tropics; Japan and the Philippines may have been inside the Arctic Circle; South America and Africa were likely near the South Pole, with either present-day Brazil or western Africa as the locus of the pole. The land surface was buried by an ice sheet, possibly as deep as that covering Antarctica today