Type
Subchron
Age range
164.32–164.24 Ma
Middle Jurassic
Callovian
M38n.2r
M38n.3n
M38n.3r
164.32164.31164.31164.31164.30164.29164.29164.28164.28164.28164.27164.26164.26164.25164.25164.25164.24