In the geologic timescale the Bathonian is an age or stage of the Middle Jurassic. It lasted from approximately 168.3 Ma to around 166.1 Ma (million years ago). The Bathonian age succeeds the Bajocian age and precedes the Callovian age. ==Stratigraphic definitions== The Bathonian stage takes its name from Bath, a spa town in England built on Juras...
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http://en.wikipedia.org/wiki/Bathonian
A stage of the Jurassic 166.1 - 161.3 Ma
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https://www.encyclo.co.uk/local/20501
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