Type
Subchron
Age range
138.42–138.25 Ma
Early Cretaceous
Berriasian
M12Ar
M13n
M13r
138.42138.41138.40138.39138.38138.37138.36138.35138.34138.33138.32138.31138.30138.29138.28138.27138.26138.25