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Trefawr Track : ウィキペディア英語版 | Trefawr Track
Trefawr Track, a forestry road north of Cwm-coed-Aeron Farm, Llandovery, Wales, is the location of the Global Boundary Stratotype Section and Point (GSSP) which marks the boundary between the Rhuddanian and Aeronian stages of the Silurian period on the geologic time scale. The GSSP was ratified in 1984. The boundary is defined as the first appearance of the graptolite ''Monograptus austerus sequens'' (the base of the ''Monograptus triangulatus'' biozone). The section is primarily mudstone, which yields an abundance of shelly faunas. The graptolite ''Diplograptus elongatus'' occurs immediately below the boundary. == References == *
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Trefawr Track」の詳細全文を読む
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