Type
Sub-age
Age range
50.835–50.628 Ma
C22r
C23n.1n
C23n.1r
50.8450.8350.8250.8150.8050.7950.7850.7750.7650.7550.7450.7350.7250.7150.7050.6950.6850.6750.6650.6550.6450.6350.62