SCIENCE|natural and applied sciences|earth sciences|geology
- córas Tagairt Faomhadh an téarma seo mar chuid de Thionscadal Lex
- ga
- system
- en
- Sainmhíniú "chronostratigraphic unit above a series and below an erathem and whose geochronologic equivalent is a period" Tagairt "COM-Terminology Coordination, based on: International Commission on Stratigraphy. Stratigraphic Guide. 'Chapter 9. Chronostratigraphic Units' (8.3.2024)"
- Nóta "A system is composed of several consecutive series."