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geochronology methods
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Stone Age
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Tertiary
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Asmari Formation (4)
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middle Eocene
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Oligocene
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Boom Clay (1)
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Paleocene
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middle Paleocene
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upper Paleocene
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Tyonek Formation (1)
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Shahejie Formation (1)
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Coal Measures (4)
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Mesozoic
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Antalya Complex (1)
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Cretaceous
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Dakota Formation (2)
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Lower Cretaceous
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Albian
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Wealden (1)
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Lower Greensand (1)
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Upper Cretaceous
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Bearpaw Formation (1)
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Austin Chalk (1)
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Jurassic
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Lower Jurassic
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Toarcian
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lower Toarcian (1)
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upper Liassic (1)
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Middle Jurassic
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Xishanyao Formation (1)
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Opalinus Clay (3)
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Upper Jurassic
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Cotton Valley Group (2)
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Fulmar Formation (1)
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Haynesville Formation (5)
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Navajo Sandstone (2)
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Triassic
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Lower Triassic
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Moenkopi Formation (1)
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Upper Triassic
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Keuper (1)
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Yanchang Formation (1)
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Vaca Muerta Formation (2)
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Wingate Sandstone (1)
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Paleozoic
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Berea Sandstone (19)
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Bonanza King Formation (1)
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Eau Claire Formation (3)
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Carboniferous
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Benxi Formation (1)
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Middle Carboniferous (1)
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Mississippian
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Barnett Shale (4)
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Lower Mississippian
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Upper Mississippian
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Middle Pennsylvanian
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Upper Carboniferous (2)
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Devonian
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Middle Devonian
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Hamilton Group (1)
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Marcellus Shale (4)
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Millboro Shale (1)
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Upper Devonian
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Brallier Shale (1)
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Duperow Formation (1)
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Famennian
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Wabamun Group (1)
-
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Frasnian (1)
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Nisku Formation (1)
-
-
-
Dunkard Group (2)
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lower Paleozoic
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Rose Run Sandstone (1)
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Minnelusa Formation (1)
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Ordovician
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Majiagou Formation (1)
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Middle Ordovician
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Platteville Formation (1)
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Saint Peter Sandstone (3)
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Simpson Group (1)
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-
Upper Ordovician
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Juniata Formation (2)
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Wufeng Formation (1)
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-
-
Permian
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Coconino Sandstone (2)
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Lower Permian
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Leonardian (1)
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Wolfcampian (2)
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Rotliegendes (1)
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Shihezi Formation (1)
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Upper Permian
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Zechstein (2)
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Vryheid Formation (2)
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Silurian
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Lower Silurian
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Tuscarora Formation (1)
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Wenlock (1)
-
-
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Taiyuan Formation (1)
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upper Paleozoic
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Bakken Formation (1)
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Dwyka Formation (1)
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Shanxi Formation (2)
-
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Woodford Shale (1)
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Precambrian
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Archean
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Catoctin Formation (1)
-
upper Precambrian
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Proterozoic
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Malmani Subgroup (1)
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Mesoproterozoic
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Wumishan Formation (1)
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Neoproterozoic
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Paleoproterozoic (2)
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Sinian
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Wumishan Formation (1)
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igneous rocks
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volcanic rocks
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ignimbrite (6)
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welded tuff (6)
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ophiolite (3)
-
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metamorphic rocks
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amphibolites (5)
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skarn (1)
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metavolcanic rocks (3)
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phyllites (2)
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quartzites (7)
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slates (9)
-
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ophiolite (3)
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turbidite (4)
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-
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native elements
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oxides
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rutile (1)
-
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silicates
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amphibole group
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hornblende (1)
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tremolite (1)
-
-
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pyroxene group
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clinopyroxene (1)
-
-
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framework silicates
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feldspar group
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plagioclase
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bytownite (1)
-
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silica minerals
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opal (1)
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quartz (19)
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tridymite (1)
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zeolite group
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clinoptilolite (1)
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laumontite (1)
-
-
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orthosilicates
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nesosilicates
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olivine group
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olivine (1)
-
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sheet silicates
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chlorite group
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chlorite (2)
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clay minerals
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halloysite (1)
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kaolinite (9)
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montmorillonite (3)
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smectite (11)
-
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illite (6)
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mica group
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biotite (2)
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palygorskite (1)
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pyrophyllite (1)
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sepiolite (1)
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serpentine group
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chrysotile (3)
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lizardite (2)
-
-
-
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sulfates
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anhydrite (6)
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ettringite (1)
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gypsum (12)
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iron sulfates (1)
-
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sulfides
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iron sulfides (1)
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pyrite (11)
-
-
-
Primary terms
-
Africa
-
Central Africa
-
Angola (2)
-
Gabon
-
Oklo (1)
-
-
-
East Africa
-
Afar Depression (1)
-
Ethiopia (2)
-
Ethiopian Rift (1)
-
Kenya (3)
-
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Nile Valley (1)
-
North Africa
-
Algeria (1)
-
Atlas Mountains
-
Moroccan Atlas Mountains (1)
-
-
Egypt
-
Cairo Egypt (2)
-
Kharga Oasis (1)
-
Nile Delta (1)
-
-
Morocco
-
Moroccan Atlas Mountains (1)
-
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