Lower Silurian
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Lower Silurian — n. former name for ORDOVICIAN … English World dictionary
Lower Silurian — adjective see ordovician I … Useful english dictionary
Silurian — Si*lu ri*an, a. [From L. Silures, a people who anciently inhabited a part of England and Wales.] (Geol.) 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… … The Collaborative International Dictionary of English
Silurian Period — 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… … Universalium
Silurian — Geological period from=444 middle=429 to=416 o2=14 co2=4500 temp=17The Silurian is a geologic period and system that extends from the end of the Ordovician period, about 443.7 ± 1.5 Ma (million years ago), to the beginning of the Devonian period … Wikipedia
Evolution — Evolution (History and Scientific Foundation) † Catholic Encyclopedia ► Evolution (History and Scientific Foundation) The world of organisms comprises a great system of individual forms generally classified according to structural… … Catholic encyclopedia
Thelodonti — Temporal range: 453–359 Ma … Wikipedia
Clinton Group — Stratigraphic range: Late Silurian Rocks of the Clinton Group on the east face of Schuylkill Gap Type sedimentary Sub units Rochester Shale … Wikipedia
Tumblagooda sandstone — The Tumblagooda sandstone is a geological formation deposited during the Silurian or Ordovician periods, around four to five hundred million years ago, and is now exposed on the west coast of Australia, straddling the boundary of the Carnarvon… … Wikipedia
Thylacocephala — Taxobox | name = Thylacocephala fossil range = Early Cambrian Late Cretaceous regnum = Animalia phylum = Arthropoda subphylum = Crustacea? classis = Thylacocephala classis authority = Pinna, Arduini, Pesarini and Teruzzi, 1982The Thylacocephala… … Wikipedia
