51.1 - 45.9 Ma

The definition of this interval in the timescale North American Land Mammal Ages is taken from the following source:

• F. J. Goin, E. C. Vieytes, J. N. Gelfo, L. Chornogubsky, A. N. Zimicz and M. A. Reguero. 2020. New Metatherian Mammal from the Early Eocene of Antarctica. Journal of Mammalian Evolution 27:17-36 view

There are intervals in 10 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Eocene epoch, Lutetian age, Ypresian age
• Cenozoic Subepochs: Early Eocene subepoch, Middle Eocene subepoch
• Mammal Paleogene Zones: MP 10 zone, MP 12 zone, MP 11 zone, MP 7 zone, MP 13 zone, MP 15 zone, MP 14 zone, MP 8 + 9 zone
• Paleogene Mammal Ages of Asia: Sharamurunian age, Irdinmanhan age, Bumbanian age, Arshantan age
• North American Mammal Subages/Zones: Twinbuttean subage, Blacksforkian subage, Gardnerbuttian subage
• South American Land Mammal Ages: Mustersan age, Casamayoran age
• Calcareous Nannoplankton Zones: NP14 zone, NP13 zone, NP12 zone, NP15 zone
• Planktic Foraminiferal Zones: G. nuttalli LOZ zone, A. cuneicamerata LOZ zone, M. aragonensis/M. subbotinae CRZ zone, A. pentacamerata PRZ zone
• Geomagnetic Polarity Chrons: C20 chron, C23 chron, C21 chron, C22 chron
• Cretaceous-Cenozoic of New Zealand: Mangaorapan age, Dannevirke epoch, Heretaungan age

This interval is used in the definition of 710 collections

A total of 710 collections with 3852 occurrences lie within this time span