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BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
NTCambrian
 Ordovician
 Silurian
 Devonian
 Carboniferous
 Permian
 Acadian Phase
 Alice Springs Orogeny
 Antler Orogeny
 Arbuckle Group
 Baralaba Coal Measures
 Bedford Shale
 Berea Sandstone
 Bird Spring Formation
 Bowers Supergroup
 Broken River Formation
 Bucksport Formation
 Caledonian Orogeny
 Cape Elizabeth Formation
 Casco Bay Group
 Casper Formation
 Catskill Formation
 Chattanooga Shale
 Collier Shale
 Cow Head Group
 Deadwood Formation
 Downtonian
 Dunkard Group
 Earn Group
 Ellesmerian Orogeny
 Ellis Bay Formation
 Endicott Group
 Exshaw Formation
 Geirud Formation
 Hanson Creek Formation
 Hartland Formation
 Hidden Valley Dolomite
 Honaker Trail Formation
 Horton Group
 Hunton Group
 Ishbel Group
 Itarare Subgroup
 Keyser Limestone
 Kittery Formation
 Knox Group
 Laborcita Formation
 Leinster Granite
 Lisburne Group
 lower Paleozoic
 Magdalena Group
 Manhattan Formation
 Maroon Formation
 Matapedia Group
 Merrimack Group
 middle Paleozoic
 Mikabu System
 Minnelusa Formation
 Oquirrh Formation
 Ouachita Orogeny
 Paganzo Group
 Peel Sound Formation
 Petersburg Granite
 Phuket Group
 Pilot Shale
 Rangeley Formation
 Read Bay Formation
 Ringerike Sandstone
 Road River Formation
 Rondout Formation
 Sambagawa Belt
 Shawangunk Formation
 Shoo Fly Complex
 Silvretta Group
 Taconic Orogeny
 Taiyuan Formation
 Talchir Formation
 Talladega Group
 Tensleep Sandstone
 Tippecanoe Sequence
 Tulghes Series
 upper Paleozoic
 Waits River Formation
 Weber Sandstone
 Wells Formation
 Wissahickon Formation
 Woodford Shale
RTPhanerozoic
 Nubian Sandstone
 Moldanubian
 lower Gondwana System
 Catalina Schist
 Ceneri Zone
 Rhenohercynian
 Saxothuringian
 Klodzko Unit
 Shuswap Complex
 New England Orogeny
 Riggins Group
 Yellow Aster Complex