广义两栖类导航范围以东柯克顿 Balanerpeton 样本及其 3.41±0.03 亿年前碎屑锆石最大沉积年龄约束作为老端证据锚点，以 0 Ma 的现生两栖类作为年轻端；最大沉积年龄不是化石直接测年、全球首现、现生两栖冠群年龄或直系祖先主张。
claim:taxon:amphibia:fossil-range图谱首页 / 参考文献 / New U-Pb constraints and geochemistry of the East Kirkton Quarry, Scotland: Implications for early tetrapod evolution in the Carboniferous
参考文献 / paperNew U-Pb constraints and geochemistry of the East Kirkton Quarry, Scotland: Implications for early tetrapod evolution in the Carboniferous
Garza, H.K.; Catlos, E.J.; Lapen, T.J.; Clarke, J.A.; Brookfield, M.E.
年份2025
来源角色primary-study
DOI / ID10.1371/journal.pone.0321714
适用范围
range · geochronology · methods
Detrital-zircon LA-ICP-MS study reporting a 341 ± 3 Ma maximum depositional age for East Kirkton Unit 82; an MDA is an upper age constraint and not a direct date on Balanerpeton.