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Intervals
Macrostrat
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Clarkforkian
182
Type
Age
Age range
57.5–56
Ma
International Timescale
Eocene
Ypresian
Paleocene
Thanetian
North American Land Mammal Ages
Wasatchian
Clarkforkian
Tiffanian
North American Regional
Wasatchian
Clarkforkian
Tiffanian
57.5
57.4
57.3
57.2
57.1
57.0
56.9
56.8
56.7
56.6
56.5
56.4
56.3
56.2
56.1
56.0
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