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Encyclopedia > Aeronian
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In the geologic timescale, the Aeronian is the age of the Llandovery epoch of the Silurian period of the Paleozoic era of the Fanerozoic eon that is comprehended between 439 million and 436 million years ago, approximatedly. The Aeronian age succeeds the Rhuddanian age and precedes the Telychian age, all in the same epoch. The geologic time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of the Earth. ... A geologic age is a time period on the geologic timescale delimited by major geologic or paleontologic events. ... Llandovery (Welsh: Llanymddyfri) is a market town in Carmarthenshire, Wales, lying on the River Tywi. ... Jump to: navigation, search The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443. ... In geology, a period or age is a time span of many millions of years that are assumed to have had similar characteristics. ... The Paleozoic is a major division of the geologic timescale, one of four geologic eras. ... The table and timeline of geologic periods presented here is in accordance with the dates and nomenclature proposed by the International Commission on Stratigraphy. ...

Silurian period
Llandovery Wenlock Ludlow Pridoli
Rhuddalian Aeronian Sheinwoodian Homerian Gorstian Ludfordian  
Telychian
Paleozoic era
Cambrian Ordovician Silurian Devonian Carboniferous Permian

Jump to: navigation, search The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443. ... The Paleozoic is a major division of the geologic timescale, one of four geologic eras. ... The Cambrian is a major division of the geologic timescale that begins about 542 million years before the present (BP) at the end of the Proterozoic eon and ended about 490 million years BP with the beginning of the Ordovician period. ... The Ordovician period is the second of the six (seven in North America) periods of the Paleozoic era. ... Jump to: navigation, search The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443. ... Jump to: navigation, search Disambiguation: Devonian is also an adjective relating to the English county of Devon or the people there. ... Jump to: navigation, search The Carboniferous is a major division of the geologic timescale that extends from the end of the Devonian period, about 359. ... The Permian is a geologic period that extends from about 280 to 248 million years before the present (mya). ...



Millions of Years

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Elevated Temperature Wear of Chromium Carbide Based Cermets (510 words)
Aeronian fl shales and overlying Telychian greenish-grey and red claystones of the deep shelf of the East Baltic Basin indicate different synsedimentary redox conditions of the bottom water of the sea.
In the Aeronian, the primary bioproductivity rise caused accumulation of organic-rich fl shale in deep shelf and formation of microcrystalline limestone with chertification, chert nodules, and barite in shoreward areas.
In the early Telychian, the bioproductivity decreased, as concluded from the absence of indicators of high primary bioproductivity in the Aeronian.
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