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Intervals
Macrostrat
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Wasatchian
183
Type
Age
Age range
56–52
Ma
International Timescale
Eocene
Ypresian
Paleocene
Thanetian
North American Land Mammal Ages
Bridgerian
Wasatchian
Clarkforkian
North American Regional
Bridgerian
Wasatchian
Clarkforkian
56.0
55.8
55.6
55.4
55.2
55.0
54.8
54.6
54.4
54.2
54.0
53.8
53.6
53.4
53.2
53.0
52.8
52.6
52.4
52.2
52.0
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