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Aeronian Stage
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A geologic time scale chart showing the Silurian period of the Paleozoic era, listing its epochs and stages with corresponding ages in millions of years ago, from 443.8 to 419.2 million years ago. A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years.
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Llandovery Series
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Silurian Period
Silurian Period

Aeronian Stage

geology and stratigraphy
Written by
John P. Rafferty
John P. Rafferty writes about Earth processes and the environment. He serves currently as the editor of Earth and life sciences, covering climatology, geology, zoology, and other topics that relate to...
John P. Rafferty
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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History

Aeronian Stage, second of three stages of the Llandovery Series, encompassing all rocks deposited during the Aeronian Age (440.8 million to 438.5 million years ago) of the Silurian Period. The name of the interval is derived from the Cemcoed-Aeron Farm near Llandovery, Powys, Wales.

In 1984 the International Commission on Stratigraphy established the Global Stratotype Section and Point (GSSP) defining the base of the Aeronian Stage within the block-shaped mudstones of the Trefawr Formation near Llandovery. The GSSP marks the first appearance of the graptolite Monograptus triangulatus. The Aeronian Stage follows the Rhuddanian Stage and precedes the Telychian Stage.

John P. Rafferty