Aeronian
Template:Short description Template:Infobox geologic timespan In the geologic timescale, the Aeronian is an age of the Llandovery Epoch of the Silurian Period of the Paleozoic Era of the Phanerozoic Eon that began 440.5 ± 1.0 Ma and ended 438.6 ± 1.0 Ma (million years ago). The Aeronian Age succeeds the Rhuddanian Age and precedes the Telychian Age, all in the same epoch.[1]
During the Aeronian the Sedgwickii Event occurred in which graptolite diversity was greatly reduced.[2] 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).[2]
It was also from this time that the first gnathostomates appeared, represented by the genera Qianodus and Fanjingshania.
GSSP
The GSSP is located in the Trefawr Track section, 500m north of Cwm-coed-Aeron Farm, Wales, UK.[3] 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.[4]
References
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- ^ Page Module:Citation/CS1/styles.css has no content."GSSP Table - All Periods". International Commission on Stratigraphy. Retrieved 2018-09-15.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Lopez, Fernando Enrique; Kaufmann, Cintia (2023). "New insights on the Silurian graptolite biostratigraphy of the La Chilca Formation, Poblete Norte section, Central Precordillera of San Juan, Argentina: faunal replacement and paleoenvironmental implications". Andean Geology. 50 (2). doi:10.5027/andgeov50n2-3617.
- ^ Page Module:Citation/CS1/styles.css has no content.Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (2004). A Geologic Time Scale 2004. ISBN 9780521786737.
- ^ Page Module:Citation/CS1/styles.css has no content."GSSP for Aeronian Stage". International Commission on Stratigraphy. Retrieved September 15, 2018.
