- of the Silures
Origin of Silurianbecause the rocks were first found in an area in southeastern Wales: see Silures designating or of the third geologic period of the Paleozoic Era, characterized by the development of coral reefs and small land plants, the first fish with jaws, and the first land arthropods
the Silurian Period or its rocks
Of, relating to, or being the period of geologic time from about 443 to 416 millions years ago, the third period of the Paleozoic Era. The Silurian Period is characterized by the development of jawed fishes, early invertebrate land animals, and land plants. See Table at geologic time.
The Silurian Period.
Origin of SilurianFrom Latin Silures, an ancient people of southwest Wales, where the rocks were first identified.