Ludfordian ICS Stage
From 421.3 +/- 2.6 To 418.7 +/- 2.7 Ma
Start Defined By: Imprecise. May be near base of Saetograptus
leintwardinensis graptolite zone.
End Defined By: Graptolite, lowest occurrence of Monograptus parultimus.
Start Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
End Based On: Gradstein, Ogg, Smith, _A Geologic Time Scale 2004_
Global Stratotype Section and Point: Sunnyhill Quarry, Ludlow, Shropshire,
southwest England, UK
-- A Substage of --
Eon: Phanerozoic (542 - -5.5012e-005)
Era: Paleozoic (542 - 251)
Period: Silurian (443.7 - 416)
Epoch: Late Silurian (422.9 - 416)
Sub-Epoch: Ludlow (422.9 - 418.7)
Australian Stage: Melbournian (428.2 - 416)
Chinese Stage: Miaogoalingian (422 - 418.7)
North American Stage: Cayugan (421.3 - 416)
-- Preceeded By --
ICS Stage: Gorstian (422.9 - 421.3)
North American Stage: Niagaran (438 - 421.3)
-- Followed By --
Sub-Epoch: Pridoli (418.7 - 416)
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