Pridoli Series

Pridoli Series

      uppermost of four main divisions of the Silurian (Silurian Period) System, representing those rocks deposited worldwide during the Pridoli Epoch (418.7–416 million years ago). The series name is derived from the Pridoli area of the Daleje Valley on the outskirts of Prague in the Czech Republic, where about 20 to 50 metres (about 65 to 165 feet) of platy limestone strata rich in cephalopods (cephalopod) and bivalves (bivalve) are well-developed.

      By international agreement, the base of the Pridoli Series is defined by the first occurrence of the graptolite species Monograptus parultimus in rock exposures at the entrance to the Pozary Quarries, which lie about 1.5 km (about 1 mile) east of Reporyje, outside of southwestern Prague. The M. parultimus biozone, in short, constitutes the global stratotype section and point (GSSP) for the base of the series. In addition, two species of chitinozoans (a type of marine plankton), Urnochitina urna and Fungochitina kosovensis, first occur at or just above the base of the series. The earliest known simple vascular land plants (plant), of the genus Cooksonia, typically occur in the lower portions of the Pridoli Series in many parts of the world. The Pridoli Series is overlain by the Lochkovian Stage, the first stage of the Devonian System (Devonian Period). The base of the Lochkovian and the base of the Devonian System automatically define the top of the Pridoli and thus the top of the Silurian System. The Pridoli Series has not been divided into stages and is underlain by the Ludlow Series.

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Universalium. 2010.

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  • Ludlow Series — ▪ geology       the third of four main divisions (in ascending order) making up the Silurian (Silurian Period) System; it represents all those rocks on a global basis deposited during the Ludlow Epoch (422.9–418.7 million years ago). The name is… …   Universalium

  • 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

  • Pridolium — System Serie Stufe ≈ Alter (mya) höher höher höher jünger Silur Pridolium 418,7–416 …   Deutsch Wikipedia

  • Ludlovium — System Serie Stufe ≈ Alter (mya) höher höher höher jünger Silur Pridolium 418,7–416 …   Deutsch Wikipedia

  • Ludlow (Serie) — System Serie Stufe ≈ Alter (mya) höher höher höher jünger Silur Pridolium 418,7–416 …   Deutsch Wikipedia

  • Ludlowium — System Serie Stufe ≈ Alter (mya) höher höher höher jünger Silur Pridolium 418,7–416 …   Deutsch Wikipedia

  • Ludlow (Geologie) — System Serie Stufe ≈ Alter (mya) höher höher höher jünger Silur Pridolium 418,7–416 …   Deutsch Wikipedia

  • Lochkovian Stage — ▪ geology       lowermost of the three standard worldwide divisions of Early Devonian (Devonian Period) rocks and time. It is the lowest division of the Devonian Period and the Lower Devonian Series. The Lochkovian Stage spans the interval… …   Universalium

  • Junggaria — Temporal range: Late Pridoli …   Wikipedia

  • Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… …   Wikipedia

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