Scientific Earth Drilling Information Service - SEDIS
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Silurian
BT
Chronostratigraphic Units
.
Phanerozoic
..
Paleozoic
...
Silurian
NT
Llandovery
Wenlock
Ludlow
Priduli
Aberystwyth Grits
Bass Islands Dolomite
Clinch Sandstone
Crab Orchard Formation
Fusselman Dolomite
Henryhouse Formation
Lower Silurian
Middle Silurian
Perry Mountain Formation
Rockwood Formation
Sangerville Formation
Scandian Orogeny
Upper Silurian
Vassalboro Formation
Waterville Formation
UF
Gothlandian
Gotlandian
RT
Ellis Bay Formation
Broken River Formation
Dalradian
Berwick Formation
Merrimack Group
Henderson Gneiss
Downtonian
range
New York City Group
Peel Sound Formation
Hanson Creek Formation
Hunton Group
Hidden Valley Dolomite
Kittery Formation
Madrid Formation
SN
Above Ordovician, below Devonian.