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geochronology methods
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geologic age
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      - Miocene
        
        Columbia River Basalt Group (66)
        
        Ellensburg Formation (2)
        
        Frenchman Springs Member (1)
        
        Grande Ronde Basalt (22)
        
        lower Miocene (5)
        
        middle Miocene (13)
        
        Picture Gorge Basalt (13)
        
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        upper Miocene
        
        Puente Formation (1)
        
        Wanapum Basalt (6)
        
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      - Ringold Formation (3)
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    - Paleogene
      - Eocene
        
        Bridger Formation (1)
        
        Chumstick Formation (3)
        
        Clarno Formation (1)
        
        Green River Formation (1)
        
        Lake Gosiute (1)
        
        lower Eocene (1)
        
        middle Eocene
        
        Laney Shale Member (1)
        
        Tyee Formation (1)
        
        Swauk Formation (4)
        
        Umpqua Formation (1)
        
        upper Eocene
        
        Cowlitz Formation (1)
        
        Wilkins Peak Member (1)
      - lower Paleogene (1)
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        lower Oligocene (1)
        
        upper Oligocene (1)
      - Paleocene
        
        lower Paleocene
        
        K-T boundary (1)
        
        upper Paleocene (1)
      - Paleocene-Eocene Thermal Maximum (1)
      - Renova Formation (2)
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    - upper Tertiary (1)
  - upper Cenozoic (2)
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- Mesozoic
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  - Cretaceous
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    - Lower Cretaceous
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    - Middle Cretaceous (3)
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      - Gulfian
        
        Woodbine Formation (1)
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      - Santonian (2)
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  - Jurassic
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    - Upper Jurassic
      - Buckner Formation (1)
      - Galice Formation (1)
      - Josephine Ophiolite (1)
      - Morrison Formation (2)
      - Oxfordian (1)
      - Smackover Formation (1)
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      - Swift Formation (1)
      - Tithonian (1)
  - Triassic
    - Chanares Formation (1)
    - Lower Triassic
      - Permian-Triassic boundary (5)
      - Smithian (2)
    - Middle Triassic
      - Anisian (1)
    - Montney Formation (2)
    - Shublik Formation (1)
    - Upper Triassic
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  - Vaca Muerta Formation (1)
- MIS 2 (1)
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- Paleozoic
  - Cambrian
    - Lower Cambrian
      - Poleta Formation (1)
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    - Middle Cambrian
      - Burgess Shale (1)
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    - Upper Cambrian
      - Furongian
        
        Paibian (1)
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  - Carboniferous
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    - Mississippian
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        Kekiktuk Conglomerate (1)
        
        Tournaisian (1)
      - Upper Mississippian
        
        Pennington Formation (1)
        
        Serpukhovian (1)
    - Pennsylvanian
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        Paradox Formation (1)
      - Upper Pennsylvanian
        
        Gzhelian (1)
    - Upper Carboniferous
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      - Marcellus Shale (1)
    - Old Red Sandstone (1)
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    - Upper Devonian
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      - Kanayut Conglomerate (1)
  - Honaker Trail Formation (1)
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  - lower Paleozoic (1)
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  - Ordovician
    - Lower Ordovician
      - Arenigian (2)
      - Ellenburger Group (1)
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    - Middle Ordovician
      - Bromide Formation (1)
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      - Dapingian (1)
      - Darriwilian (4)
      - Normanskill Formation (1)
    - Pogonip Group (1)
    - Upper Ordovician
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      - Caradocian (1)
      - Hirnantian (2)
      - Trentonian (2)
      - Wufeng Formation (1)
    - Viola Limestone (1)
  - Permian
    - Cutler Formation (1)
    - Echooka Formation (1)
    - Guadalupian
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      - Wordian (1)
    - Lower Permian
      - Cisuralian
        
        Artinskian (1)
        
        Asselian (1)
        
        Kungurian (2)
      - Leonardian (1)
    - Ranger Canyon Formation (2)
    - Upper Permian
      - Lopingian
        
        Wuchiapingian (1)
      - Permian-Triassic boundary (5)
  - Silurian
    - Lockport Formation (1)
    - Lower Silurian
      - Grimsby Sandstone (1)
      - Llandovery (1)
      - Tuscarora Formation (1)
      - Wenlock (2)
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  - upper Paleozoic
    - Kiaman Superchron (1)
  - Wissahickon Formation (1)
- Phanerozoic (4)
- Precambrian
  - Archean
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    - Paleoarchean
      - Hooggenoeg Formation (1)
  - Baltimore Gneiss (1)
  - Chuar Group (2)
  - Onverwacht Group (2)
  - Pongola Supergroup (2)
  - Unkar Group (1)
  - upper Precambrian
    - Proterozoic
      - Banxi Group (1)
      - Great Oxidation Event (1)
      - Kombolgie Formation (1)
      - Mesoproterozoic
        
        Belt Supergroup (3)
        
        Missoula Group (1)
        
        Ravalli Group (1)
      - Neoproterozoic
        
        Cryogenian (3)
        
        Dengying Formation (3)
        
        Doushantuo Formation (2)
        
        Ediacaran (10)
        
        Nantuo Formation (1)
        
        Tonian (2)
        
        Vendian (8)
      - Paleoproterozoic (11)
      - Pocatello Formation (1)
      - Sinian
        
        Dengying Formation (3)
        
        Doushantuo Formation (2)
        
        Nantuo Formation (1)
  - Vadito Group (1)
- Vindhyan (1)
igneous rocks
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        dunite (1)
        
        harzburgite (2)
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  - volcanic rocks
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        alkali olivine basalt (1)
        
        hawaiite (1)
      - flood basalts (36)
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      - olivine tholeiite (1)
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    - dacites (4)
    - glasses
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    - pyroclastics
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      - pumice (4)
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      - tuff (9)
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    - rhyolites (14)
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- ophiolite (2)
- volcanic ash (2)
metamorphic rocks
- metamorphic rocks
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  - metaigneous rocks
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  - metasedimentary rocks
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meteorites
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        SNC Meteorites
        
        chassignite
        
        Chassigny Meteorite (1)
        
        shergottite (1)
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minerals
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- carbonates
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- oxides
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- phosphates
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- silicates
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        hornblende (2)
        
        pargasite (1)
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        augite (1)
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  - chlorophaeite (1)
  - framework silicates
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        sanidine (1)
      - plagioclase
        
        albite (2)
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    - nepheline group
      - kalsilite (1)
      - nepheline (1)
    - scapolite group
      - scapolite (1)
    - silica minerals
      - opal (1)
      - quartz (5)
    - zeolite group
      - analcime (2)
      - clinoptilolite (1)
      - erionite (2)
      - gmelinite (1)
      - heulandite (1)
      - laumontite (1)
      - mesolite (1)
      - natrolite (2)
  - orthosilicates
    - nesosilicates
      - garnet group (3)
      - kyanite (1)
      - olivine group
        
        olivine (3)
      - titanite group
        
        titanite (1)
      - zircon group
        
        zircon (41)
    - sorosilicates
      - epidote group
        
        epidote (1)
  - sheet silicates
    - chlorite group
      - chlorite (2)
    - clay minerals
      - kaolinite (3)
      - montmorillonite (1)
      - nontronite (3)
      - smectite (6)
    - illite (3)
    - mica group
      - biotite (2)
      - celadonite (1)
      - muscovite (2)
    - serpentine group
      - antigorite (1)
      - berthierine (1)
      - cronstedtite (1)
      - lizardite (1)
      - serpentine (1)
    - talc (1)
- sulfates
  - gypsum (1)
- sulfides
  - molybdenite (1)
Primary terms
- absolute age (93)
- academic institutions (1)
- Africa
  - Blue Nile (2)
  - Congo Craton (2)
  - East Africa
    - Ethiopia
      - Omo Valley (1)
    - Kenya
      - East Turkana Basin (1)
      - Kenya Rift valley (2)
      - Turkana District (1)
    - Lake Turkana (2)
    - Mozambique (1)
    - Tanzania
      - Olduvai Gorge (1)
    - Turkana Basin (2)
    - Uganda (1)
    - Zambia (1)
  - East African Lakes
    - Lake Turkana (2)
  - East African Rift (3)
  - Namib Desert (1)
  - Nile River (1)
  - North Africa
    - Egypt
      - Nile Delta (1)
    - Libya
      - Murzuk Basin (1)
  - Nubian Shield (1)
  - Southern Africa
    - Barberton greenstone belt (1)
    - Kaapvaal Craton (1)
    - Kalahari Craton (2)
    - Namibia (3)
    - South Africa
      - Bushveld Complex (2)
      - Limpopo South Africa (1)
      - Merensky Reef (1)
      - Mpumalanga South Africa
        
        Barberton Mountain Land (1)
      - Transvaal region (1)
      - Vaal River (1)
      - Western Cape Province South Africa