{Pentamerus limestone} (Geol.), a Silurian limestone composed largely of the shells of Pentamerus. [1913 Webster]
The Collaborative International Dictionary of English. 2000.
Pentamerus — Pen*tam e*rus, n. [NL. See {Pentamerous}.] (Paleon.) A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian. [1913 Webster] {Pentamerus limestone} (Geol.), a Silurian limestone composed largely of the shells of… … The Collaborative International Dictionary of English
Aymestry Limestone — The Aymestry Limestone is an inconstant limestone deposited in a warm shallow sea near the eastern margin of the Iapetus Ocean. It occurs in England in the Ludlow series of Silurian rocks, between the Upper and Lower Ludlow Shales. It derives its … Wikipedia
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
Red Mountain (Birmingham, Alabama) — Red Mountain is a long ridge running southwest northeast and dividing Jones Valley from Shades Valley south of Birmingham, Alabama, United States. It is part of the Ridge and Valley province of the Appalachian mountains. The Red Mountain… … Wikipedia
Wenlock Group — (Wenlockian), in geology, is the middle series of strata in the Silurian (Upper Silurian) of Great Britain. This group in the typical area in the Welsh border counties contains the following formations: Much Wenlock Limestone Formation, 90 300 ft … Wikipedia
Llandovery Group — In geology, the Llandovery Group refers to the lowest division of the Silurian period (Upper Silurian) in Britain. It is named after the town of Llandovery in Wales, although Charles Lapworth had proposed the name Valentian (from the Roman… … Wikipedia
