Type
Zone
Age range
166.6–166.4 Ma

International Timescale

Middle Jurassic
Bathonian

Ammonite Zonation - Boreal

Oxycerites orbis
Procerites hodsoni
Morrisiceras morrisi
166.60166.59166.58166.57166.56166.55166.54166.53166.52166.51166.50166.49166.48166.47166.46166.45166.44166.43166.42166.41166.40

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