Middle Mississippian

Middle Mississippian is a epoch-level unit in the ICS 2026/06 timescale, displayed here from 346.7 to 330.3 Ma.

Represented range346.7 ± 0.4 Ma → 330.3 ± 0.4 Ma

Parent unitCarboniferous

ICS version2026/06

Evidence boundary

eag and lag are display projections of the versioned boundary records below. Phanerozoic numerical ages do not define the units; their GSSPs do. null uncertainty means the chart publishes a fixed GSSA/display value without an uncertainty in the numerical-age column.

Older boundary: 346.7 ± 0.4 Ma · Younger boundary: 330.3 ± 0.4 Ma · gtsd:MiddleMississippian

Numerical ages are versioned display values; Phanerozoic units are defined by GSSPs rather than by the numerical ages themselves.

References

International Chronostratigraphic Chart v2026/06Cohen, K.M.; Harper, D.A.T.; Gibbard, P.L.; Car, N. · 2026 · DOI 10.18814/epiiugs/2025/025001

ICS 2026/06 ↗RDF / CC BY 4.0 ↗