Thực đơn
Tầng_HirnantThực đơn
Tầng_HirnantLiên quan
Tầng Tầng lớp Itaewon Tầng đối lưu Tầng Apt Tầng Champagne Tầng Carnia Tầng Anisia Tầng Noria Tầng Ladinia Tầng OlenekTài liệu tham khảo
WikiPedia: Tầng_Hirnant http://www.palaeos.com/Paleozoic/Ordovician/LateOr... http://www.scotese.com/mlordcli.htm http://stratigraphy.science.purdue.edu/gssp/index.... http://zircon.geology.union.edu/Gildner/globe.html http://hannover.park.org/Canada/Museum/extinction/... http://www.stratigraphy.org/geowhen/stages/Late_Or... http://www.stratigraphy.org/index.php/ics-chart-ti... //tools.wmflabs.org/geohack/geohack.php?language=v... https://web.archive.org/web/19991011121121/http://... https://web.archive.org/web/20050321004858/http://...