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Intervals
Macrostrat
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Bridgerian
408
Type
Age
Age range
52–47.9
Ma
International Timescale
Eocene
Lutetian
Ypresian
North American Land Mammal Ages
Uintan
Bridgerian
Wasatchian
North American Regional
Uintan
Bridgerian
Wasatchian
52.0
51.8
51.6
51.4
51.2
51.0
50.8
50.6
50.4
50.2
50.0
49.8
49.6
49.4
49.2
49.0
48.8
48.6
48.4
48.2
48.0
47.8
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