SCIENCE|natural and applied sciences|earth sciences|geology
- a Chéim Thortónach Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
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- Tortonian stage
- en
- Definition "fifth stage of the Miocene series representing all rocks deposited worldwide during the Tortonian Age (11.6 million to 7.2 million years ago) of the Neogene Period (23 million to 2.6 million years ago)" Reference "COM-Terminology Coordination, based on: Britannica, The Editors of Encyclopaedia. ""Tortonian Stage"" (8.3.2024). Encyclopedia Britannica, 7 Jul. 2011."