Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Subage and Substage

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_2369

A subage is lower than an age in the hierarchy of regional geochronologic units. It is equivalent to the time span of a substage (regional stratigraphic unit). A substage is the rock that formed during a subage; it is a regional stratigraphic unit that is lower than a stage and is a subdivision of a stage. The nomenclature is similar to that of stages; they are named after a location. A substage can also be labelled as a lower substage, middle substage or upper substage.

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