Bridgerian North American Stage

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Bridgerian North American Stage is a faunal stage in the North American Land Mammal Ages (NALMA) timeline. It lasted about 4.1 million years, from roughly 50.3 to 46.2 million years ago. It spans the early to middle Eocene and overlaps the Ypresian and Lutetian ages. The Bridgerian comes after the Wasatchian and before the Uintan. It includes several substages.