In the geologic timescale, the Aeronian is the age of the Llandovery epoch of the Silurian period of the Paleozoic era of the Phanerozoic eon that began 440.8 ± 1.2 Ma 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.[3]

Epochs in the Silurian
Epochs of the Silurian Period.
Axis scale: millions of years ago.


The GSSP is located in the Trefawr Track section, 500m north of Cwm-coed-Aeron Farm, Wales, UK.[4] The GSSP lies within the gently-dipping blocky mudstones of the Trefawr Formation, which principally yield abundant and diverse shelly faunas, but also contain enough graptolites to allow recognition of several biozones.[5]



Agnathans of the Aeronian
Taxa Presence Location Description Images
Rhuddanian-Telychian It had an elongated body and a dorsal fin and an anal fin near the back third of its body.


Arthropods of the Aeronian
Taxa Presence Location Description Images
Balizoma 440.8 million years ago to Pridoli epoch Dudley, England only been found in rocks of Silurian age.


Cephalopods of the Aeronian
Taxa Presence Location Description Images
Dapingian-Homerian The shallow seas of Laurentia, Baltica and Siberia.[6] Head was soft muscular tissue at the opening of hard cone-like shell.


  1. Jeppsson, L.; Calner, M. (2007). "The Silurian Mulde Event and a scenario for secundo—secundo events". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 93 (02): 135–154. doi:10.1017/S0263593300000377.
  2. Munnecke, A.; Samtleben, C.; Bickert, T. (2003). "The Ireviken Event in the lower Silurian of Gotland, Sweden-relation to similar Palaeozoic and Proterozoic events". Palaeogeography, Palaeoclimatology, Palaeoecology. 195 (1): 99–124. doi:10.1016/S0031-0182(03)00304-3.
  3. "GSSP Table - All Periods". International Commission on Stratigraphy. Retrieved 2018-09-15.
  4. Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (2004). A Geologic Time Scale 2004. ISBN 9780521786737.
  5. "GSSP for Aeronian Stage". International Commission on Stratigraphy. Retrieved September 15, 2018.
  6. Frey, R.C. 1995. "Middle and Upper Ordovician nautiloid cephalopods of the Cincinnati Arch region of Kentucky, Indiana, and Ohio" (PDF). U.S. Geological Survey, p.73

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