Type
Zone
Age range
165.5–165 Ma

International Timescale

Middle Jurassic
Callovian
Bathonian

Ammonite Zonation - Boreal

Sigloceras calloviense
Prolanulites koenigi
Macrocephalites herveyi
165.52165.50165.48165.46165.44165.42165.40165.38165.36165.34165.32165.30165.28165.26165.24165.22165.20165.18165.16165.14165.12165.10165.08165.06165.04165.02165.00164.98

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