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Intervals
Macrostrat
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M28n.4r
1187
Type
Subchron
Age range
164.78–164.65
Ma
International Timescale
Middle Jurassic
Callovian
Geomagnetic Polarity Subchron
M38n.4n
M28n.4r
M38n.5n
164.78
164.77
164.76
164.75
164.74
164.73
164.72
164.71
164.70
164.69
164.68
164.67
164.66
164.65
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