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Paleozoic

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Acadian Phase Acatlan Complex Alice Springs Orogeny Ambo Group Antler Orogeny …

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geologic age
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        K-T boundary (1)
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- Mesozoic
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    - Upper Cretaceous
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      - Gulfian
        
        Eagle Ford Formation (2)
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      - Niobrara Formation (2)
      - Two Medicine Formation (1)
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  - Jurassic
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    - Lower Jurassic
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  - Triassic
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    - Moenkopi Formation (2)
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    - Upper Triassic
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- Paleozoic
  - Acatlan Complex (6)
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  - Cambrian
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    - Lower Cambrian
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    - Middle Cambrian
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    - Upper Cambrian
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      - Pilgrim Formation (1)
      - Trempealeauan (1)
  - Cape Elizabeth Formation (1)
  - Carboniferous
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    - Lower Carboniferous
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    - Mississippian
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      - Lower Mississippian
        
        Fort Payne Formation (2)
        
        Kinderhookian (1)
        
        Osagian
        
        Burlington Limestone (1)
        
        Keokuk Limestone (1)
        
        Pocono Formation (4)
        
        Tournaisian (4)
      - Madison Group (2)
      - Middle Mississippian
        
        Visean (4)
      - Price Formation (1)
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      - Upper Mississippian
        
        Chesterian
        
        Imo Formation (1)
        
        Greenbrier Limestone (1)
        
        Hartselle Sandstone (1)
        
        Mauch Chunk Formation (5)
        
        Meramecian
        
        Saint Louis Limestone (1)
        
        Salem Limestone (1)
        
        Parkwood Formation (1)
        
        Pennington Formation (1)
        
        Pitkin Limestone (1)
      - Windsor Group (2)
    - Namurian (2)
    - Pennsylvanian
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      - Freeport Formation (2)
      - Herrin Coal Member (1)
      - Joggins Formation (1)
      - Kittanning Formation (3)
      - Lower Pennsylvanian
        
        Crab Orchard Mountains Group (1)
        
        Gizzard Group (2)
        
        Morrowan
        
        Bloyd Formation (1)
        
        New River Formation (1)
        
        Pocahontas Formation (4)
      - Mansfield Formation (1)
      - Middle Pennsylvanian
        
        Allegheny Group (11)
        
        Atokan
        
        Atoka Formation (1)
        
        Breathitt Formation (1)
        
        Carbondale Formation (1)
        
        Danville Coal Member (1)
        
        Desmoinesian (1)
        
        Dugger Formation (1)
        
        Kanawha Formation (6)
      - Minturn Formation (2)
      - Monongahela Group (3)
      - Morien Group (1)
      - Pittsburgh Coal (2)
      - Pottsville Group (12)
      - Springfield Coal Member (3)
      - Upper Pennsylvanian (7)
    - Schoonover Sequence (1)
    - Upper Carboniferous
      - Stephanian (1)
      - Westphalian (1)
  - Casco Bay Group (1)
  - Catskill Formation (7)
  - Chattanooga Shale (1)
  - Devonian
    - Beaverhill Lake Group (1)
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    - Lower Devonian
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    - Middle Devonian
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      - Eifelian (2)
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      - Hamilton Group (2)
      - Mahantango Formation (1)
      - Marcellus Shale (7)
      - Moscow Formation (1)
      - Onondaga Limestone (1)
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    - Millboro Shale (1)
    - Old Red Sandstone (3)
    - Traverse Group (1)
    - Upper Devonian
      - Brallier Shale (1)
      - Chemung Formation (2)
      - Famennian (7)
      - Frasnian (6)
      - Hampshire Formation (1)
      - Jefferson Group (1)
      - Kellwasser event (1)
  - Dunkard Group (2)
  - Helderberg Group (1)
  - Horton Group (2)
  - Itarare Subgroup (2)
  - Keyser Limestone (1)
  - Kittery Formation (1)
  - Knox Group (2)
  - lower Paleozoic
    - Ashe Formation (2)
    - Berwick Formation (1)
    - Chopawamsic Formation (2)
    - Conococheague Formation (3)
    - Glenarm Series (3)
    - Wilmington Complex (2)
  - Maroon Formation (1)
  - Merrimack Group (1)
  - middle Paleozoic (5)
  - Minnelusa Formation (1)
  - Ordovician
    - Lexington Limestone (2)
    - Lower Ordovician
      - Arenigian
        
        Ballantrae Complex (1)
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      - Ellenburger Group (1)
      - Prairie du Chien Group (2)
      - Saint George Group (1)
      - Tremadocian
        
        Halifax Formation (1)
    - Martinsburg Formation (3)
    - Meguma Group (1)
    - Middle Ordovician
      - Black River Group (1)
      - Cloridorme Formation (1)
      - Deicke Bentonite Bed (1)
      - Galena Dolomite (1)
      - Glenwood Shale (1)
      - Llanvirnian (1)
      - Millbrig Bentonite Bed (1)
      - Normanskill Formation (2)
      - Platteville Formation (3)
      - Saint Peter Sandstone (1)
    - Miramichi Group (1)
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    - Skiddaw Slates (1)
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    - Upper Ordovician
      - Ashgillian (1)
      - Bighorn Dolomite (1)
      - Cincinnatian (2)
      - Juniata Formation (2)
      - Katian (3)
      - Maquoketa Formation (1)
      - Neda Formation (1)
      - Reedsville Formation (1)
      - Sandbian (1)
      - Trentonian (1)
      - Whitewater Formation (1)
      - Wufeng Formation (1)
    - Valmy Formation (3)
    - Vinini Formation (1)
    - Wild Bight Group (1)
  - Permian
    - Castile Formation (1)
    - Cutler Formation (1)
    - Ecca Group (2)
    - Guadalupian (2)
    - Lower Permian
      - Al Khlata Formation (1)
      - Leman Sandstone Formation (1)
      - Leonardian (3)
      - Wolfcampian (3)
    - Lyons Sandstone (2)
    - McCloud Limestone (3)
    - Middle Permian (1)
    - Park City Formation (1)
    - Phosphoria Formation (2)
    - Rotliegendes (1)
    - Toroweap Formation (1)
    - Unayzah Formation (1)
    - Upper Permian
      - Cadeby Formation (1)
      - Lopingian (1)
      - Permian-Triassic boundary (4)
      - Zechstein (4)
  - Sauk Sequence (1)
  - Shawangunk Formation (1)
  - Shoo Fly Complex (8)
  - Silurian
    - Lower Silurian
      - Brassfield Formation (2)
      - Llandovery (3)
      - Tuscarora Formation (3)
      - Wenlock (1)
    - Middle Silurian
      - McKenzie Formation (1)
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      - Rose Hill Formation (1)
    - Niagaran (2)
    - Upper Silurian
      - Bloomsburg Formation (1)
      - Cayugan
        
        Tonoloway Limestone (1)
      - Ludlow (1)
      - Salina Group (2)
  - Taiyuan Formation (1)
  - Talladega Group (4)
  - Tensleep Sandstone (1)
  - upper Paleozoic
    - Antrim Shale (3)
    - Bakken Formation (4)
    - Calaveras Formation (2)
    - Copacabana Group (1)
    - Dwyka Formation (3)
    - Fountain Formation (3)
  - Wissahickon Formation (4)
  - Woodford Shale (1)
- Phanerozoic (3)
- Precambrian
  - Archean
    - Neoarchean (2)
  - Baltimore Gneiss (3)
  - Catoctin Formation (2)
  - Eocambrian (1)
  - Great Smoky Group (1)
  - Stirling Quartzite (1)
  - Uinta Mountain Group (1)
  - upper Precambrian
    - Proterozoic
      - Algonkian
        
        Baraboo Quartzite (1)
      - Lewisian (1)
      - Mesoproterozoic (9)
      - Neoproterozoic
        
        Cryogenian (1)
        
        Dengying Formation (1)
        
        Doushantuo Formation (2)
        
        Ediacaran (13)
        
        Lynchburg Formation (1)
        
        Moine Supergroup (1)
        
        Torridonian (1)
        
        Vendian (6)
      - Paleoproterozoic (6)
      - Sinian
        
        Dengying Formation (1)
        
        Doushantuo Formation (2)
- Rhenohercynian (1)
- Saxothuringian (3)
- Vindhyan (2)
igneous rocks
- igneous rocks
  - kimberlite (2)
  - plutonic rocks
    - anorthosite (2)
    - diabase (2)
    - diorites
      - plagiogranite (1)
      - quartz diorites (2)
      - tonalite (7)
    - gabbros
      - norite (1)
    - granites
      - alkali granites (1)
      - aplite (1)
      - A-type granites (3)
      - biotite granite (1)
      - charnockite (1)
      - I-type granites (6)
      - leucogranite (8)
      - monzogranite (4)
      - S-type granites (6)
    - granodiorites (7)
    - lamproite (1)
    - lamprophyres (2)
    - monzodiorite (1)
    - pegmatite (3)
    - syenites (1)
    - ultramafics
      - chromitite (1)
      - peridotites
        
        dunite (1)
        
        harzburgite (1)
        
        lherzolite (2)
      - pyroxenite
        
        garnet pyroxenite (1)
        
        websterite (2)
  - volcanic rocks
    - andesites
      - boninite (1)
    - basalts
      - flood basalts (3)
      - mid-ocean ridge basalts (8)
      - ocean-island basalts (2)
      - tholeiite (2)
      - tholeiitic basalt (1)
      - trap rocks (1)
    - dacites (1)
    - pyroclastics
      - tuff (4)
    - rhyolites (2)
    - trachytes (1)
- ophiolite (27)
- volcanic ash (1)
metamorphic rocks
- K-bentonite (3)
- metamorphic rocks
  - amphibolites (12)
  - cataclasites (2)
  - </