https://gcmdservices.gsfc.nasa.gov/kms/concept/4e10cbfa-f2d3-4397-a353-752126197158
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definition | In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 166.1 ± 4.0 Ma (million years ago) and 163.5 ± 4.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the Oxfordian. | ||||||
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in scheme | chronounits original |