Tham khảo Tầng Olenek

↑ “International Chronostratigraphic Chart” (PDF). International Commission on Stratigraphy. 2020.
↑ According to Gradstein (2004). Brack et al. (2005) give 251 to 248 Ma
↑ See for a detailed geologic timescale Gradstein et al. (2004)
↑ Tozer E. T. (1965): Lower Triassic stages and ammonoid zones of Arctic Canada: Paper of the Geological Survey of Canada 65:1–14.

Văn liệu

Brack, Peter; Rieber, Hans; Nicora, Alda; Mundil, Roland (ngày 1 tháng 12 năm 2005). “The Global boundary Stratotype Section and Point (GSSP) of the Ladinian Stage (Middle Triassic) at Bagolino (Southern Alps, Northern Italy) and its implications for the Triassic time scale”. Episodes. 28 (4): 233–244. doi:10.18814/epiiugs/2005/v28i4/001.
Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press.
Kiparisova, L.D. & Popov, J.N.; 1956: Расчленение нижнего отдела триасовой системы на ярусы (Subdivision of the lower series of the Triassic System into stages), Doklady Akademii Nauk SSSR 109(4), pp 842–845.

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