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Data sets Publications Expeditions Thesaurus
middle Oligocene  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Paleogene
 ....Oligocene
 .....middle Oligocene
NTBucatunna Formation
 Byram Formation
 Marianna Limestone
 Vicksburg Group
RTupper Oligocene
 White River Group
 Brule Formation
 lower Oligocene