Table 2.

Fossils and their age ranges used for primary calibration of the molecular clock

No.	Fossil name	Description	Origin	Age (Ma)	Epoch	Publication
1	Chenopodipollis multiplex	Pollen record	USA	65–56	Palaeocene	Nichols and Traverse (1971)
2	Salicornites massalongoi	Part of an axis	Italy	35–23	Oligocene	Principi (1926)
3	Parvangula randeckensis	Chenopodium-Like seeds	Germany	23–16	Early Miocene	Gregor (1982)