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        lower Eocene
        
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        middle Eocene
        
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        upper Eocene
        
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        lower Paleocene
        
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        middle Paleocene
        
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        upper Paleocene
        
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      - White River Group (5)
      - Wilcox Group (1)
    - Pirabas Formation (1)
    - Pysht Formation (2)
    - Shahejie Formation (1)
    - Sobral Formation (1)
    - upper Tertiary (5)
  - upper Cenozoic
    - Ituzaingo Formation (1)
    - Karewa Group (1)
    - Pico Formation (1)
    - Villafranchian (3)
  - Verde Formation (1)
  - Wildcat Group (1)
- Coal Measures (4)
- Dalradian (1)
- Mesozoic
  - Antalya Complex (2)
  - Bisbee Group (1)
  - Cretaceous
    - Alisitos Formation (1)
    - Bahariya Formation (1)
    - Blairmore Group (1)
    - Colorado Group (1)
    - Comanchean
      - Antlers Sands (1)
      - Buda Limestone (1)
      - Edwards Formation (1)
      - Glen Rose Formation (2)
      - Paluxy Formation (1)
      - Trinity Group (2)
      - Washita Group (3)
    - Dakota Formation (6)
    - Gosau Formation (1)
    - Graneros Shale (3)
    - Hatteras Formation (1)
    - Judea Group (1)
    - Lower Cretaceous
      - Agrio Formation (4)
      - Albian
        
        lower Albian (5)
        
        upper Albian (14)
      - Antlers Sands (1)
      - Aptian
        
        lower Aptian (1)
        
        Shuaiba Formation (2)
      - Barremian (21)
      - Bear River Formation (1)
      - Berriasian (9)
      - Blake-Bahama Formation (1)
      - Cadomin Formation (1)
      - Cedar Mountain Formation (1)
      - Christopher Formation (2)
      - Clearwater Formation (3)
      - Cloverly Formation (2)
      - Crato Formation (3)
      - Edwards Formation (1)
      - Glen Rose Formation (2)
      - Hauterivian (13)
      - Isachsen Formation (2)
      - Kiowa Formation (6)
      - Mannville Group (1)
      - McMurray Formation (2)
      - Muderong Shale (1)
      - Mural Limestone (2)
      - Neocomian (5)
      - Paluxy Formation (1)
      - Speeton Clay (1)
      - Trinity Group (2)
      - Urgonian (1)
      - Valanginian (11)
      - Wealden (1)
    - Middle Cretaceous
      - Bhuj Series (1)
    - Nenjiang Formation (2)
    - Potomac Group (4)
    - Santana Formation (2)
    - Shiranish Formation (2)
    - Toolebuc Formation (1)
    - Upper Cretaceous
      - Bearpaw Formation (7)
      - Belly River Formation (2)
      - Blackhawk Formation (1)
      - Buda Limestone (1)
      - Campanian
        
        Cerro del Pueblo Formation (1)
        
        Dinosaur Park Formation (10)
        
        lower Campanian (12)
        
        upper Campanian (17)
      - Cardium Formation (2)
      - Carlile Shale (5)
      - Cenomanian
        
        Dunvegan Formation (1)
        
        lower Cenomanian (3)
        
        upper Cenomanian (5)
      - Codell Sandstone Member (1)
      - Coniacian (14)
      - Demopolis Chalk (1)
      - Djadokhta Formation (2)
      - Eutaw Formation (2)
      - Ferron Sandstone Member (1)
      - Fort Hays Limestone Member (1)
      - Fox Hills Formation (7)
      - Fruitland Formation (1)
      - Greenhorn Limestone (7)
      - Gulfian
        
        Aguja Formation (4)
        
        Austin Group (3)
        
        Eagle Ford Formation (1)
        
        Navarro Group (1)
        
        Olmos Formation (1)
        
        Prairie Bluff Chalk (3)
        
        Woodbine Formation (1)
      - Hell Creek Formation (20)
      - Hilliard Shale (1)
      - Hornbrook Formation (3)
      - Horseshoe Canyon Formation (7)
      - Javelina Formation (1)
      - Judith River Formation (17)
      - Kaiparowits Formation (2)
      - Kanguk Formation (4)
      - Kirtland Shale (2)
      - Kodiak Formation (4)
      - K-T boundary (23)
      - Ladd Formation (2)
      - Lameta Formation (1)
      - Lance Formation (7)
      - Laramie Formation (2)
      - Maestrichtian
        
        lower Maestrichtian (11)
        
        upper Maestrichtian (16)
      - Maevarano Formation (1)
      - Magothy Formation (1)
      - Marshalltown Formation (2)
      - Mesaverde Group (1)
      - Milk River Formation (9)
      - Monmouth Group (1)
      - Montana Group (2)
      - Mooreville Chalk (3)
      - Moreno Formation (5)
      - Navesink Formation (2)
      - Neuquen Group (1)
      - Niobrara Formation (10)
      - Ojo Alamo Sandstone (1)
      - Oldman Formation (13)
      - Pierre Shale (16)
      - Point Loma Formation (1)
      - Prince Creek Formation (2)
      - Raritan Formation (3)
      - Ripley Formation (2)
      - Rosario Formation (2)
      - Saint Mary River Formation (1)
      - Santonian (28)
      - Saratoga Chalk (1)
      - Schrader Bluff Formation (1)
      - Selma Group (3)
      - Senonian (178)
      - Sharon Springs Member (1)
      - Smoky Hill Chalk Member (3)
      - Straight Cliffs Formation (2)
      - Turonian
        
        lower Turonian (4)
        
        upper Turonian (1)
      - Two Medicine Formation (3)
    - Viking Formation (1)
    - Weald Clay (2)
    - Yezo Group (5)
  - Franciscan Complex (6)
  - Glen Canyon Group (1)
  - Great Valley Sequence (2)
  - Jurassic
    - Carmel Formation (3)
    - Fernie Formation (3)
    - Lower Jurassic
      - Domerian (1)
      - Hettangian (17)
      - lower Liassic (21)
      - middle Liassic (15)
      - Pliensbachian (22)
      - Sinemurian (12)
      - Toarcian
        
        lower Toarcian (2)
      - Triassic-Jurassic boundary (3)
      - upper Liassic (22)
    - Middle Jurassic
      - Aalenian (8)
      - Bajocian (18)
      - Bathonian
        
        upper Bathonian (2)
      - Callovian (37)
      - Dogger (2)
      - Walloon Coal Measures (1)
      - Xishanyao Formation (1)
    - Oxford Clay (5)
    - Posidonia Shale (2)
    - Solnhofen Limestone (4)
    - Twin Creek Limestone (1)
    - Upper Jurassic
      - Bossier Formation (1)
      - Bowser Lake Group (1)
      - Brushy Basin Member (1)
      - Kimmeridge Clay (2)
      - Kimmeridgian
        
        lower Kimmeridgian (3)
        
        upper Kimmeridgian (2)
      - La Casita Formation (1)
      - Malm (1)
      - Morrison Formation (14)
      - Naknek Formation (1)
      - Oxfordian
        
        middle Oxfordian (3)
        
        upper Oxfordian (3)
      - Portlandian (15)
      - Sundance Formation (2)
      - Swift Formation (1)
      - Tithonian (18)
      - Volgian (1)
  - Kayenta Formation (3)
  - Kunga Group (1)
  - Longarm Formation (1)
  - lower Mesozoic (3)
  - Maiolica Limestone (1)
  - McHugh Complex (1)
  - Mist Mountain Formation (1)
  - Moenave Formation (1)
  - Newark Supergroup (3)
  - Sandilands Formation (4)
  - Triassic
    - Cordevolian (1)
    - Fremouw Formation (4)
    - Hallstatt Limestone (1)
    - Liard Formation (2)
    - Lower Triassic
      - Dinwoody Formation (1)
      - Griesbachian (3)
      - Induan (3)
      - Olenekian (1)
      - Panchet Series (1)
      - Permian-Triassic boundary (20)
      - Scythian (2)
      - Smithian (7)
      - Spathian (5)
      - Thaynes Formation (3)
    - Middle Triassic
      - Anisian (27)
      - Doig Formation (3)
      - Ladinian (11)
      - Muschelkalk (3)
    - Moenkopi Formation (1)
    - Montney Formation (2)
    - Narrabeen Group (2)
    - Red Peak Formation (1)
    - Shublik Formation (1)
    - Takla Group (1)
    - Upper Triassic
      - Baldonnel Formation (2)
      - Carnian
        
        Ischigualasto Formation (3)
      - Chinle Formation (4)
      - Dockum Group (2)
      - Keuper (2)
      - Luning Formation (1)
      - Norian (27)
      - Pardonet Formation (3)
      - Petrified Forest Member (2)
      - Rhaetian
        
        Penarth Group (2)
      - Triassic-Jurassic boundary (3)
  - upper Mesozoic
    - Yixian Formation (5)
  - Vaca Muerta Formation (3)
- MIS 5 (1)
- Paleozoic
  - Bedford Shale (1)
  - Berea Sandstone (1)
  - Bird Spring Formation (6)
  - Cambrian
    - Acadian (1)
    - Carrara Formation (3)
    - Conasauga Group (1)
    - Lower Cambrian
      - Atdabanian (2)
      - Chilhowee Group (1)
      - Kinzers Formation (2)
      - Poleta Formation (7)
      - Terreneuvian
        
        Fortunian (2)
      - Tommotian (1)
      - Yudoma Series (1)
    - Middle Cambrian
      - Burgess Shale (24)
      - Marjum Formation (6)
      - Wheeler Formation (11)
      - Zhangxia Formation (1)
    - Pioche Shale (10)
    - Upper Cambrian
      - Bonneterre Formation (1)
      - Dresbachian (1)
      - Furongian
        
        Jiangshanian (2)
        
        Paibian (4)
      - Lamotte Sandstone (1)
      - Nopah Formation (2)
      - Orr Formation (2)
      - Potsdam Sandstone (1)
      - Steptoean (3)
      - Trempealeauan (2)
      - Wilberns Formation (3)
  - Carboniferous
    - Albert Formation (1)
    - Amsden Formation (1)
    - Benxi Formation (1)
    - Lower Carboniferous
      - Asbian (5)
      - Dinantian (69)
    - Middle Carboniferous (2)
    - Mississippian
      - Barnett Shale (1)
      - Bear Gulch Limestone Member (2)
      - Boone Formation (2)
      - Borden Group (13)
      - Harrodsburg Limestone (3)
      - Lower Mississippian
        
        Chouteau Limestone (2)
        
        Cuyahoga Formation (4)
        
        Fort Payne Formation (9)
        
        Kinderhookian
        
        Banff Formation (2)
        
        Lake Valley Formation (4)
        
        Lodgepole Formation (1)
        
        Osagian
        
        Burlington Limestone (9)
        
        Keokuk Limestone (3)
        
        Tournaisian
        
        upper Tournaisian (2)
      - Middle Mississippian
        
        Visean
        
        upper Visean (6)
      - Newman Limestone (2)
      - Price Formation (1)
      - Ramp Creek Formation (2)
      - Upper Mississippian
        
        Bangor Limestone (2)
        
        Chesterian
        
        Imo Formation (6)
        
        Renault Formation (1)
        
        Fayetteville Formation (7)
        
        Greenbrier Limestone (3)
        
        Hartselle Sandstone (2)
        
        Heath Formation (2)
        
        Meramecian
        
        Saint Louis Limestone (3)
        
        Sainte Genevieve Limestone (1)
        
        Salem Limestone (4)
        
        Warsaw Formation (4)
        
        Monteagle Limestone (1)
        
        Pennington Formation (1)
        
        Pitkin Limestone (3)
        
        Pride Mountain Formation (1)
        
        Serpukhovian (10)
      - Windsor Group (2)
    - Namurian (17)
    - Pennsylvanian
      - Brazil Formation (1)
      - Conemaugh Group (3)
      - Cumberland Group (2)
      - Francis Creek Shale (9)
      - Hermosa Group (1)
      - Joggins Formation (4)
      - La Salle Limestone (1)
      - Lower Pennsylvanian
        
        Bashkirian (8)
        
        Caseyville Formation (2)
        
        Crab Orchard Mountains Group (1)
        
        Morrowan
        
        Bloyd Formation (1)
        
        New River Formation (1)
      - Marble Falls Group (2)
      - Mattoon Formation (3)
      - Middle Pennsylvanian
        
        Allegheny Group (4)
        
        Atokan
        
        Atoka Formation (2)
        
        Carbondale Formation (10)
        
        Desmoinesian
        
        Hartshorne Sandstone (1)
        
        Labette Shale (1)
        
        Wewoka Formation (4)
        
        Dugger Formation (2)
        
        Kanawha Formation (1)
        
        Kewanee Group (2)
        
        Moscovian (13)
        
        Paradox Formation (1)
        
        Staunton Formation (2)
      - Minturn Formation (3)
      - Monongahela Group (1)
      - Pottsville Group (3)
      - Saginaw Formation (1)
      - Springfield Coal Member (1)
      - Upper Pennsylvanian
        
        Cisco Group (1)
        
        Gzhelian (12)
        
        Kasimovian (7)
        
        Missourian
        
        Kansas City Group (4)
        
        Lansing Group (4)
        
        Plattsburg Limestone (2)
        
        Rock Lake Shale Member (3)
        
        Stanton Formation (4)
        
        Wann Formation (2)
        
        Wyandotte Limestone (1)
        
        Virgilian
        
        Douglas Group (2)
        
        Plattsmouth Limestone Member (1)
        
        Shawnee Group (1)
        
        Tonganoxie Sandstone (1)
      - Watahomigi Formation (1)
    - Silesian (1)
    - Upper Carboniferous
      - Millstone Grit (1)
      - Stephanian (7)
      - Westphalian (18)
  - Catskill Formation (3)
  - Chattanooga Shale (1)
  - Cow Head Group (15)
  - Deadwood Formation (2)
  - Devonian
    - Genesee Group (1)
    - Guilmette Formation (2)
    - Hunsruck Shale (1)
    - Levis Shale (5)
    - Lost Burro Formation (1)
    - Lower Devonian
      - Battery Point Formation (2)
      - Coeymans Formation (1)
      - Dittonian (1)
      - Emsian (46)
      - Gedinnian (4)
      - Helderbergian (1)
      - Lochkovian (24)
      - Manlius Formation (2)
      - Oriskany Sandstone (1)
      - Pragian (16)
      - Siegenian (6)
      - York River Formation (2)
    - Middle Devonian
      - Balaklala Rhyolite (1)
      - Boyle Dolomite (2)
      - Cedar Valley Formation (3)
      - Columbus Limestone (4)
      - Delaware Limestone (3)
      - Detroit River Group (1)
      - Dundee Limestone (3)
      - Eifelian (30)
      - Givetian
        
        upper Givetian (2)
      - Hamilton Group (12)
      - Ludlowville Formation (4)
      - Marcellus Shale (3)
      - Michelle Formation (1)
      - Moscow Formation (3)
      - Onondaga Limestone (1)
      - Saint Laurent Limestone (1)
      - Tully Limestone (1)
    - Old Red Sandstone (1)
    - Ponta Grossa Formation (3)
    - Ramparts Formation (1)
    - Swan Hills Formation (1)
    - Traverse Group (4)
    - Upper Devonian
      - Duperow Formation (1)
      - Famennian
        
        lower Famennian (4)
        
        upper Famennian (3)
      - Frasnian
        
        upper Frasnian (2)
      - Hampshire Formation (1)
      - Kellwasser event (3)
      - Lime Creek Formation (3)
      - Ohio Shale (3)
      - Olentangy Shale (1)
      - Sonyea Group (1)
      - West Falls Formation (2)
    - Upper Old Red Sandstone (1)
    - Zlichovian (1)
  - Downtonian (1)
  - Ellis Bay Formation (14)
  - Geirud Formation (1)
  - Hanson Creek Formation (1)
  - Helderberg Group (1)
  - Honaker Trail Formation (1)
  - Horton Group (1)
  - Hunton Group (1)
  - Itarare Subgroup (2)
  - Keyser Limestone (3)
  - Lisburne Group (2)
  - lower Paleozoic
    - Cape Phillips Formation (25)
    - Penobscot Formation (2)
  - Madera Formation (1)
  - Magdalena Group (1)
  - Matapedia Group (2)
  - New Albany Shale (1)
  - Oquirrh Formation (1)
  - Ordovician
    - Acoite Formation (2)
    - Antelope Valley Limestone (2)
    - Clays Ferry Formation (1)
    - Eureka Quartzite (1)
    - Gualcamayo Formation (3)
    - Gull River Formation (1)
    - Lexington Limestone (3)
    - Lower Ordovician
      - Arenigian
        
        Ballantrae Complex (2)
      - Beekmantown Group (4)
      - El Paso Group (1)
      - Fillmore Formation (11)
      - Floian (10)
      - Ibexian (11)
      - Manitou Formation (2)
      - Saint George Group (2)
      - Tremadocian (46)
    - Martinsburg Formation (3)
    - Meguma Group (1)
    - Middle Ordovician
      - Black River Group (1)
      - Blackriverian (6)
      - Bromide Formation (11)
      - Champlainian (4)
      - Chazy Group (1)
      - Chazyan (2)
      - Cloridorme Formation (1)
      - Dapingian (5)
      - Darriwilian (32)
      - Decorah Shale (5)
      - Dolgeville Formation (1)
      - Galena Dolomite (5)
      - Lenoir Limestone (1)
      - Llandeilian (7)
      - Llanvirnian (10)
      - Platteville Formation (8)
      - Table Head Group (5)
      - Whiterockian (11)
      - Winnipeg Formation (1)
    - Pogonip Group (4)
    - Skiddaw Slates (2)
    - Tetagouche Group (1)
    - Trenton Group (7)
    - Upper Ordovician
      - Ashgillian (29)
      - Bighorn Dolomite (2)
      - Caradocian (26)
      - Cincinnatian
        
        Maysvillian (3)
        
        Richmondian (6)
      - Edenian
        
        Eden Shale (1)
      - Fairview Formation (2)
      - Hirnantian (24)
      - Katian (40)
      - Kope Formation (3)
      - Lorraine Group (1)
      - Maquoketa Formation (6)
      - Mohawkian (2)
      - Queenston Shale (1)
      - Red River Formation (7)
      - Sandbian (12)
      - Trentonian (9)
      - Whitewater Formation (2)
    - Utica Shale (2)
    - Valmy Formation (1)
    - Viola Limestone (1)
  - Peel Sound Formation (1)
  - Permian
    - Akiyoshi Limestone (1)
    - Coconino Sandstone (1)
    - Council Grove Group (2)
    - Cutler Formation (1)
    - Ecca Group (2)
    - Gharif Formation (1)
    - Guadalupian
      - Bell Canyon Formation (8)
      - Brushy Canyon Formation (2)
      - Capitan Formation (1)
      - Capitanian (10)
      - Cherry Canyon Formation (3)
      - Roadian (4)
      - Tansill Formation (2)
      - Ufimian (1)
      - Wordian (6)
    - Hennessey Formation (3)
    - Hughes Creek Shale (1)
    - Illawarra Coal Measures (1)
    - Kaibab Formation (2)
    - Kamthi Formation (1)
    - Khuff Formation (6)
    - Longtan Formation (1)
    - Lower Permian
      - Abo Formation (3)
      - Autunian (1)
      - Barakar Stage (1)
      - Cherry Canyon Formation (3)
      - Cisuralian
        
        Artinskian (9)
        
        Asselian (14)
        
        Kungurian (13)
        
        Sakmarian (12)
      - Leonardian
        
        Bone Spring Limestone (4)
        
        Clear Fork Group (5)
      - Qixia Formation (1)
      - Wichita Group (2)
      - Wolfcampian
        
        Hueco Limestone (2)
    - Maokou Formation (2)
    - McCloud Limestone (1)
    - Middle Permian (28)
    - Park City Formation (2)
    - Phosphoria Formation (1)
    - Rio Bonito Formation (2)
    - Rotliegendes (2)
    - Unayzah Formation (1)
    - Upper Permian
      - Cadeby Formation (1)
      - Changxing Formation (3)
      - Lopingian
        
        Changhsingian (18)
        
        Wuchiapingian (7)
      - Permian-Triassic boundary (20)
      - Tatarian (1)
      - Zechstein (3)
    - Vryheid Formation (1)
    - Wellington Formation (5)
    - Yates Formation (2)
  - Read Bay Formation (13)
  - Road River Formation (11)
  - Silurian
    - Bainbridge Formation (1)
    - Henryhouse Formation (2)
    - Lockport Formation (5)
    - Lower Silurian
      - Alexandrian (1)
      - Brassfield Formation (11)
      - Llandovery
        
        Aeronian (12)
        
        Rhuddanian (13)
        
        Telychian (12)
      - Tuscarora Formation (2)
      - Wenlock
        
        Homerian (8)
        
        Sheinwoodian (2)
      - Whirlpool Sandstone (1)
    - Middle Silurian
      - Clinton Group (2)
      - Guelph Formation (1)
      - Racine Dolomite (3)
      - Roberts Mountains Formation (4)
      - Rochester Formation (5)
      - Rose Hill Formation (1)
      - Waldron Shale (4)
    - Niagaran (12)
    - Upper Silurian
      - Ludlow
        
        Gorstian (2)
        
        Ludfordian (3)
      - Pridoli (17)
      - Salina Group (1)
  - Supai Formation (1)
  - Taiyuan Formation (1)
  - Talchir Formation (1)
  - Tensleep Sandstone (1)
  - upper Paleozoic
    - Antrim Shale (1)
    - Copacabana Group (1)
    - Dwyka Formation (1)
    - Fountain Formation (1)
    - Guandacol Formation (1)
  - Woodford Shale (1)
- Phanerozoic (27)
- Precambrian
  - Chuar Group (2)
  - Gunflint Iron Formation (1)
  - upper Precambrian
    - Proterozoic
      - Bitter Springs Formation (1)
      - Damara System (1)
      - Mesoproterozoic
        
        Apache Group (1)
        
        Belt Supergroup (2)
        
        Newland Limestone (1)
        
        Roper Group (2)
        
        Wumishan Formation (1)
      - Miette Group (1)
      - Neoproterozoic
        
        Cryogenian (2)
        
        Dengying Formation (8)
        
        Doushantuo Formation (11)
        
        Ediacaran (61)
        
        Riphean (4)
        
        Tonian (2)
        
        Vendian (29)
        
        Wilpena Group (1)
      - Paleoproterozoic
        
        Aphebian
        
        Hurwitz Group (1)
      - Sinian
        
        Dengying Formation (8)
        
        Doushantuo Formation (11)
        
        Wumishan Formation (1)
      - Windermere System (2)
  - Wyman Formation (1)
igneous rocks
- agglutinates (6)
- igneous rocks
  - kimberlite (1)
  - plutonic rocks
    - granites
      - charnockite (1)
    - lamproite (1)
    - lamprophyres (1)
  - volcanic rocks
    - basalts
      - mid-ocean ridge basalts (1)
    - glasses (1)
    - leucitite (1)
    - melilitite (1)
    - pyroclastics
      - tuff (2)
- ophiolite (3)
metamorphic rocks
- metamorphic rocks
  - impactites (1)
  - schists (2)
- ophiolite (3)
- turbidite (6)
meteorites
- meteorites
  - stony meteorites
    - chondrites (1)
minerals
- carbonates
  - aragonite (6)
  - calcite (3)
  - dolomite (2)
- halides
  - chlorides
    - halite (2)
  - fluorides
    - fluorite (1)
- minerals (1)
- native elements
  - graphite (1)
- organic minerals
  - amber (39)
- oxides
  - ilmenite (1)
  - magnetite (1)
- phosphates
  - apatite (1)
  - carbonate apatite (1)
- silicates
  - chain silicates
    - pyroxene group (1)
  - framework silicates
    - nepheline group
      - kalsilite (1)
      - nepheline (1)
    - silica minerals
      - jasper (1)
      - opal (2)
      - quartz (1)
  - orthosilicates
    - nesosilicates
      - larnite (1)
      - olivine group
        
        olivine (1)
      - zircon group
        
        zircon (6)
    - sorosilicates
      - melilite group
        
        melilite (1)
  - sheet silicates
    - clay minerals (2)
- sulfates
  - barite (1)
  - gypsum (1)
- sulfides
  - pyrite (3)
Primary terms
- absolute age (29)
- academic institutions (1)
- Africa
  - Afar (1)
  - Central Africa
    - Angola
      - Cabinda Angola (1)
      - Cuanza Basin (1)
    - Congo (3)
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- Ocean Drilling Program
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