stage (stratigraphy)

墨西拿盐度危机 古新世至上新世的时间表 直轴：百万年前 赞克尔期（英語：Zanclean）在地质年代是上新世的最底層階段（英语：stage (stratigraphy)）早期阶段，又或是最早的一個期。其起止时间为5.332 ± 0.005百万年前和3.6 ± 0

THE CAMBRIAN: TERRENEUVIAN SERIES AND FORTUNIAN STAGE. International Subcommission on Cambrian Stratigraphy. [13 December 2020]. （原始内容存档于2022-03-28）. 

of the Lower Cretaceous, at the website of Norges Network of offshore records of geology and stratigraphy Albian Stage, Cretaceous Period in Hampshire

Survey, Urbana, Illinois. Willman, H.B., and J.C. Frye, 1970, Pleistocene Stratigraphy of Illinois. Bulletin no. 94, Illinois State Geological Survey, Champaign

(PDF)于2021-07-04）.  GSSP for Roadian Stage. International Commission on Stratigraphy. International Commission on Stratigraphy. [2020-12-13]. （原始内容存档于2021-10-25）