A chron is the geologic time corresponding to a chronozone. A chronozone is the rock that is formed within a time interval of an extended biological zone. A chronozone is a formal chronostratigraphic unit at the level below a stage. Another interpretation is that chrons and chronozones are informal or freely designated units. For example, a magnetostratigraphic unit or stratigraphic unit can be subdivided into corresponding chrons and chronozones.
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(2020). Chron and Chronozone. In: Chen, A., Ng, Y., Zhang, E., Tian, M. (eds) Dictionary of Geotourism. Springer, Singapore. https://doi.org/10.1007/978-981-13-2538-0_320
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