Type
Chron
Age range
138.25–137.94 Ma

International Timescale

Early Cretaceous
Berriasian

Geomagnetic Polarity Chron

M12
M12A
M13
138.26138.24138.22138.20138.18138.16138.14138.12138.10138.08138.06138.04138.02138.00137.98137.96137.94

Macrostrat

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