Llandoverian Stage

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Llandoverian Stage

 

(also Llandovery stage; named after the population center of Llandovery, county of Carmarthenshire, Wales, Great Britain), the first stage from the bottom of the Silurian system. It was identified in 1859 by R. Murchison. The type section is composed of carbonate sediments, primarily with benthic fauna and occasional graptolites.

It is divided into the lower, middle, and upper Llandoverian and 11 graptolitic zones bounded beneath by the Monograptus persculptus zone and above by the M. crenulatus zone. Deposits of the Llandoverian stage are widely distributed in the countries of Western Europe (France, Sweden, the Federal Republic of Germany), North Africa, North America, and the USSR, where the stage is characterized by the greatest paleontological completeness in the Baltic region, the Siberian Platform, the Urals, Middle Asia, Kazakhstan, and the Northeast.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
According to the timescale of Tucker and McKerrow (1995), these tuffs were deposited during the Llandoverian stage of the Early Silurian.