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In the geologic timescale, the Aeronian is an geologic age of the Llandovery Epoch of the Silurian geologic period of the Paleozoic geologic era of the Phanerozoic geologic eon that began 440.8 ± 1.2 annum and ended 438.5 ± 1.1 Ma (million years ago). The Aeronian Age succeeds the Rhuddanian Age and precedes the Telychian Age, all in the same epoch.
During the Aeronian the Sedgwickii Event occurred in which graptolite diversity was greatly reduced. This event has been attested in locations such as today's Canada, Libya as well as in La Chilca Formation in Argentina (then part of Gondwana).
GSSP
The GSSP is located in the Trefawr Track section, 500m north of Cwm-coed-Aeron Farm, Wales, United Kingdom. (2025). 9780521786737 ISBN 9780521786737 The GSSP lies within the gently-dipping blocky Mudstone of the Trefawr Formation, which principally yield abundant and diverse shelly faunas, but also contain enough Graptolithina to allow recognition of several Biozone.
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