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Gzhelian
BT
Chronostratigraphic Units
.
Phanerozoic
..
Paleozoic
...
Carboniferous
....
Pennsylvanian
.....
Gzhelian
BT
Chronostratigraphic Units
.
Phanerozoic
..
Paleozoic
...
Carboniferous
....
Upper Carboniferous
.....
Gzhelian
SN
Added to Thesaurus in 1981.
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