The Bridgerian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 50,300,000 to 46,200,000 years BP lasting 4.1 million years. It is usually considered to overlap the Ypresian and Lutetian within the Eocene epoch. The Bridgerian is preceded by the Wasatchian and followed by the Uintan NALMA stages.
The Bridgerian is considered to contain the following substages:
- Twinbuttean: Lower boundary source of the base of the Bridgerian (approximate).
- Lutetian which is contained within the Middle Eocene sharing the lower boundary. The Lutetian overlaps with New Zealand's Arnold epoch, Dannevirke epoch, Bortonian stage, and Heretaungan stage.
| Paleogene Period | ||
|---|---|---|
| Paleocene Epoch | Eocene Epoch | Oligocene Epoch |
| Danian | Selandian Thanetian |
Ypresian | Lutetian Bartonian |Priabonian |
Rupelian | Chattian |
Famous quotes containing the words north, american and/or stage:
“Ah, how shall you know the dreary sorrow at the North Gate,
With Li Po’s name forgotten,
And we guardsmen fed to the tigers.”
—Li Po (701–762)
“While the focus in the landscape of Old World cities was commonly government structures, churches, or the residences of rulers, the landscape and the skyline of American cities have boasted their hotels, department stores, office buildings, apartments, and skyscrapers. In this grandeur, Americans have expressed their Booster Pride, their hopes for visitors and new settlers, and customers, for thriving commerce and industry.”
—Daniel J. Boorstin (b. 1914)
“Harvey: Oh, you kids these days, I’m telling you. You think the only relationship a man and a woman can have is a romantic one.
Gil: That sure is what we think. You got something better?
Harvey: Oh, romance is very nice. A good thing for youngsters like you, but Helene and I have found something we think is more appropriate to our stage of life—companionship.
Gil: Companionship? I’ve got a flea-bitten old hound at home who’ll give me that.”
—Tom Waldman (d. 1985)