Type
Zone
Age range
183.52–181.57 Ma

International Timescale

Early Jurassic
Toarcian

Calcareous Nannoplankton Zones

NJ7
NJ6
NJ5
183.6183.5183.4183.3183.2183.1183.0182.9182.8182.7182.6182.5182.4182.3182.2182.1182.0181.9181.8181.7181.6181.5

Macrostrat

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