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all geography including DSDP/ODP Sites and Legs
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Arctic Ocean
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Mendeleyev Ridge (1)
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Asia
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Far East
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China (1)
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Indonesia
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Java (1)
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Atlantic Ocean
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Atlantic region (1)
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Canada
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Eastern Canada
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Newfoundland and Labrador
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Ontario
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Simcoe County Ontario
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Quebec (2)
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Western Canada
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New York
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Tennessee (4)
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Virginia
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Culpeper County Virginia (1)
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King George County Virginia (2)
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Pamunkey River (1)
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Rappahannock County Virginia (1)
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Rappahannock River (1)
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Rockbridge County Virginia (1)
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Stafford County Virginia (2)
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Warren County Virginia (1)
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Westmoreland County Virginia (3)
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Washington
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Hanford Site (2)
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West Virginia
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Grant County West Virginia (2)
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Hampshire County West Virginia (1)
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Hardy County West Virginia (1)
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Mineral County West Virginia (2)
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Morgan County West Virginia (1)
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Pendleton County West Virginia (1)
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Preston County West Virginia (1)
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Wayne County West Virginia (1)
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Wyoming (1)
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commodities
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barite deposits (1)
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brines (1)
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construction materials
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dimension stone (1)
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energy sources (11)
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marble deposits (2)
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metal ores
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cobalt ores (1)
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copper ores (2)
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iron ores (2)
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mineral deposits, genesis (3)
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mineral exploration (3)
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petroleum
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slate deposits (1)
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water resources (4)
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elements, isotopes
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carbon
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C-13/C-12 (2)
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C-14 (2)
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organic carbon (1)
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halogens
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bromine
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bromide ion (1)
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chlorine
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chloride ion (2)
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isotope ratios (6)
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isotopes
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radioactive isotopes
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Be-10 (1)
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C-14 (2)
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Rn-222 (1)
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stable isotopes
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C-13/C-12 (2)
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Hf-177/Hf-176 (1)
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Nd-144/Nd-143 (1)
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O-18/O-16 (4)
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S-34/S-32 (1)
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Sr-87/Sr-86 (2)
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metals
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alkaline earth metals
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beryllium
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Be-10 (1)
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strontium
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Sr-87/Sr-86 (2)
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chromium (1)
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copper (1)
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hafnium
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Hf-177/Hf-176 (1)
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iron
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ferric iron (2)
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lead (2)
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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zinc (2)
-
-
noble gases
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radon
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Rn-222 (1)
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-
-
oxygen
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O-18/O-16 (4)
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phosphorus (1)
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sulfur
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S-34/S-32 (1)
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-
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fossils
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borings (4)
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burrows (3)
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Chordata
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Vertebrata
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Pisces
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Osteichthyes
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Actinopterygii
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Teleostei (1)
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Tetrapoda
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Amphibia
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Lissamphibia
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Caudata (1)
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-
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Mammalia
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Multituberculata (1)
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Theria
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Eutheria
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Artiodactyla
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Suiformes (1)
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Cetacea (1)
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Reptilia
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Anapsida
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Testudines
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Chelonia (1)
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Cryptodira (1)
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Diapsida
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Archosauria
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Crocodilia
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Eusuchia (1)
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dinosaurs
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Ornithischia
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Ankylosauria (1)
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Lepidosauria
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Squamata
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Lacertilia
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Mosasauridae (1)
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-
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-
-
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Graptolithina
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Graptoloidea
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Monograptina
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Monograptus
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Monograptus uniformis (1)
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ichnofossils (5)
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Invertebrata
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Arthropoda
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Chelicerata
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Merostomata
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Eurypterida (2)
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Mandibulata
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Crustacea
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Cirripedia (1)
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Malacostraca (2)
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Ostracoda (4)
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Trilobitomorpha
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Trilobita (7)
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Brachiopoda
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Articulata
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Orthida (1)
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Spiriferida
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Atrypidae (1)
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Cnidaria
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Anthozoa (1)
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Echinodermata
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Crinozoa
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Crinoidea (1)
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Echinozoa
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Echinoidea (1)
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Edrioasteroidea (1)
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Mollusca
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Bivalvia
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Heterodonta
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Veneroida
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Astartidae
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Astarte (3)
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Ostreoidea (1)
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Pterioida
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Pteriina
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Pectinacea
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Pectinidae (1)
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Cephalopoda
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Ammonoidea (2)
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Gastropoda
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Naticidae (3)
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Protista
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Foraminifera
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Rotaliina
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Buliminacea
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Bulimina (1)
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Uvigerinidae
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Uvigerina (1)
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Rotaliacea
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Elphidium (1)
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Textulariina
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Lituolacea
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Ammobaculites (1)
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Radiolaria
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Osculosida
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Nassellina (1)
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Spumellina (1)
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Silicoflagellata (3)
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Vermes (1)
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microfossils
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Conodonta
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Panderodus (1)
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palynomorphs
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Dinoflagellata (8)
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megaspores (2)
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miospores
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pollen (3)
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Plantae
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algae
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diatoms (8)
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Epiphyton (1)
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nannofossils (3)
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Bryophyta
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Hepaticae (1)
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Pteridophyta
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Lycopsida (1)
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Spermatophyta
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Angiospermae
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Dicotyledoneae (1)
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Gymnospermae
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Coniferales
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Taxodium (1)
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problematic fossils (1)
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thallophytes (4)
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geochronology methods
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Ar/Ar (2)
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exposure age (1)
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fission-track dating (1)
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K/Ar (1)
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paleomagnetism (5)
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Pb/Pb (1)
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Pb/Th (1)
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U/Pb (5)
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geologic age
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Cenozoic
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Quaternary
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Holocene
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lower Holocene (1)
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upper Holocene (2)
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Pleistocene
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upper Pleistocene
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Wisconsinan (1)
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Tertiary
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Arikareean (1)
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lower Tertiary (1)
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Neogene
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Cohansey Formation (1)
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Miocene
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Barstovian (1)
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Calvert Formation (23)
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lower Miocene
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Burdigalian (1)
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Hemingfordian (1)
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middle Miocene
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Choptank Formation (16)
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Pungo River Formation (1)
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Saint Marys Formation (17)
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upper Miocene
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Eastover Formation (4)
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Tortonian (2)
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-
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Pliocene
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upper Pliocene
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Chowan River Formation (3)
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Yorktown Formation (6)
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-
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Paleogene
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Eocene
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Castle Hayne Limestone (1)
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lower Eocene
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Aquia Formation (9)
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middle Eocene
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Santee Limestone (1)
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-
Nanjemoy Formation (7)
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upper Eocene
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Piney Point Formation (2)
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-
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Oligocene
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upper Oligocene (2)
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Paleocene
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lower Paleocene
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Danian (1)
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K-T boundary (2)
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upper Paleocene
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Thanetian (2)
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-
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Paleocene-Eocene Thermal Maximum (3)
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upper Tertiary (1)
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upper Cenozoic
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Chesapeake Group (14)
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-
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Coal Measures (2)
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Mesozoic
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Cretaceous
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Logan Canyon Formation (1)
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Lower Cretaceous
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Albian (2)
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Aptian (3)
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Missisauga Formation (1)
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Potomac Group (10)
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Upper Cretaceous
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Campanian (3)
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Cenomanian
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lower Cenomanian (1)
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-
K-T boundary (2)
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Maestrichtian (2)
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Marshalltown Formation (1)
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Navesink Formation (1)
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Raritan Formation (1)
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Senonian (4)
-
-
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Jurassic
-
Lower Jurassic (2)
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Middle Jurassic (1)
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Upper Jurassic (1)
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lower Mesozoic (1)
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Newark Supergroup (1)
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Triassic
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Upper Triassic (3)
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-
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Paleozoic
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Berea Sandstone (1)
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Cambrian
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Lower Cambrian
-
Antietam Formation (1)
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Chilhowee Group (2)
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-
Upper Cambrian (7)
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Carboniferous
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Mississippian
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Logan Formation (1)
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Lower Mississippian
-
Cuyahoga Formation (1)
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Kinderhookian (1)
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Osagian (1)
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Pocono Formation (2)
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-
Price Formation (2)
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Sunbury Shale (1)
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Upper Mississippian
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Chesterian (3)
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Greenbrier Limestone (1)
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Mauch Chunk Formation (2)
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-
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Pennsylvanian
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Conemaugh Group (2)
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Middle Pennsylvanian
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Allegheny Group (2)
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Pottsville Group (2)
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Upper Pennsylvanian (2)
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Upper Carboniferous (3)
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-
Catskill Formation (2)
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Devonian
-
Lower Devonian
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Oriskany Sandstone (4)
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-
Middle Devonian
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Hamilton Group (2)
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Mahantango Formation (1)
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Marcellus Shale (4)
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Tully Limestone (1)
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-
Upper Devonian
-
Cleveland Member (1)
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Famennian (1)
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Frasnian (1)
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Hampshire Formation (2)
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Ohio Shale (1)
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-
-
Dunkard Group (1)
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Keyser Limestone (4)
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Knox Group (1)
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lower Paleozoic
-
Chopawamsic Formation (1)
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Conococheague Formation (6)
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Glenarm Series (7)
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Wilmington Complex (2)
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-
Ordovician
-
Lower Ordovician
-
Beekmantown Group (2)
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-
Middle Ordovician
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Black River Group (1)
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Trenton Group (1)
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Upper Ordovician
-
Juniata Formation (1)
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Trentonian (2)
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-
-
Permian
-
Lower Permian (1)
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Rondout Formation (2)
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Silurian
-
Lower Silurian
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Llandovery (1)
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Wenlock (1)
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-
Middle Silurian
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Clinton Group (1)
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Keefer Sandstone (1)
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McKenzie Formation (2)
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Rose Hill Formation (2)
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-
Upper Silurian
-
Bloomsburg Formation (1)
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Cayugan
-
Tonoloway Limestone (1)
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-
-
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upper Paleozoic (2)
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Wissahickon Formation (4)
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-
Phanerozoic (1)
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Precambrian
-
Baltimore Gneiss (9)
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Catoctin Formation (2)
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Eocambrian (2)
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upper Precambrian
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Proterozoic
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Mesoproterozoic (3)
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Neoproterozoic
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Ediacaran (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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diabase (1)
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gabbros (2)
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granites (5)
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pegmatite (2)
-
ultramafics
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chromitite (1)
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peridotites
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dunite (1)
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lherzolite (1)
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-
pyroxenite
-
websterite (1)
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-
-
-
volcanic rocks
-
basalts (1)
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-
-
ophiolite (3)
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-
metamorphic rocks
-
metamorphic rocks
-
gneisses
-
orthogneiss (1)
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Primary terms
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Dunkard Group (1)
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Permian
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Upper Silurian
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upper Paleozoic (2)
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Precambrian
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GeoRef Categories
Era and Period
Epoch and Age