Definitions for "Silurian"
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.
Keywords:  flecks, threads, paper, material, term
term for paper which has flecks in it, often material or threads.
Keywords:  slates, age, brown, best, derivative
The Silurian age.
rocks of Silurian age, represented in our area primarily by the slates of Down; the best derivative soils are acid brown earths, widely distributed in the Down area.