Type
Subchron
Age range
163.99–163.88 Ma

International Timescale

Middle Jurassic
Callovian

Geomagnetic Polarity Subchron

M37r
M38n.1n
M38n.1r
163.99163.99163.98163.97163.97163.97163.96163.96163.95163.94163.94163.94163.93163.93163.92163.91163.91163.91163.90163.90163.89163.88163.88

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