Type
Zone
Age range
387.5–385 Ma

International Timescale

Middle Devonian
Givetian

Conodont Zonation

Schmidtognathus hermanni
Polygnathus varcus
Polygnathus hemiansatus
387.6387.4387.2387.0386.8386.6386.4386.2386.0385.8385.6385.4385.2385.0

Macrostrat

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