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Intervals
Macrostrat
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Cayugan
155
Type
Age
Age range
425–419.62
Ma
International Timescale
Early Devonian
Lochkovian
Pridoli
Ludlow
Ludfordian
Gorstian
COSUNA
Gedinnian
Cayugan
Niagaran
North American Regional
Ulsterian
Cayugan
Niagaran
425.2
425.0
424.8
424.6
424.4
424.2
424.0
423.8
423.6
423.4
423.2
423.0
422.8
422.6
422.4
422.2
422.0
421.8
421.6
421.4
421.2
421.0
420.8
420.6
420.4
420.2
420.0
419.8
419.6
419.4
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