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Galena Dolomite
BT
Chronostratigraphic Units
.
Phanerozoic
..
Paleozoic
...
Ordovician
....
Middle Ordovician
.....
Galena Dolomite
RT
Iowa
Illinois
Wisconsin
Minnesota
SN
N Illinois, E Iowa, S Minnesota and SW Wisconsin. Added to Thesaurus in 1985.
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