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Statements

Subject Item
dbr:Cambrian
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dbr:Cambrian_Series_2
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dbr:Cambrian_Stage_10
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dbr:Cambrian_Stage_4
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dbr:Capitanian
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dbr:Carboniferous
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dbr:Carnian
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dbr:Pragian
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dbr:Pridoli_Epoch
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dbr:Ptychagnostus_atavus
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dbr:Sandbian
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dbr:Santonian
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dbr:First_appearance_datum
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dbr:Moscovian_(Carboniferous)
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dbr:Bashkirian
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dbr:Bathonian
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dbr:Devonian
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dbr:Homerian
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dbr:Permian
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dbr:Rhaetian
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dbr:Rhuddanian
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dbr:Roadian
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dbr:Valanginian
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dbr:Viséan
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dbr:North_American_land_mammal_age
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dbr:Coniacian
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dbr:Cretaceous
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dbr:Sakmarian
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dbr:Tithonian
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dbr:Cisuralian
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dbr:Eifelian
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dbr:Emsian
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dbr:Frasnian
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dbr:Furongian
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dbr:Givetian
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dbr:Global_Boundary_Stratotype_Section_and_Point
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dbr:Glyptagnostus_reticulatus
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dbr:Gorstian
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dbr:Miocene
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dbr:Mississippian_(geology)
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dbr:Conodont_biostratigraphy
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dbr:Olenekian
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dbr:Anisian
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dbr:Aptian
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dbr:Aquitanian_(stage)
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dbr:Berriasian
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dbr:Lejopyge_laevigata
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dbr:Lemdadella
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dbr:Llandovery_Epoch
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dbr:Lochkovian
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dbr:Lopingian
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dbr:Lotagnostus
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dbr:Ludlow_Epoch
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dbr:Lutetian
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dbr:Callovian
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dbr:Cambrian_Stage_2
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dbr:Cambrian_Stage_3
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dbr:Silurian
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dbr:Sinemurian
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dbr:Ypresian
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dbr:Bajocian
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dbr:Cenomanian
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dbr:Toarcian
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dbr:Tortonian
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dbr:Tournaisian
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dbr:Tremadocian
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dbr:Turonian
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dbr:Wenlock_Epoch
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dbr:Kasimovian
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dbr:Late_Jurassic
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dbr:Aalenian
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dbr:Aeronian
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dbr:Agnostotes_orientalis
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dbr:Albian
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dbr:Dapingian
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dbr:Darriwilian
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dbr:Drumian
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dbr:Early_Cretaceous
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dbr:Early_Devonian
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dbr:Early_Jurassic
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dbr:First_appearance_datum
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dbr:Early_Triassic
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dbr:First_appearance_datum
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dbr:Famennian
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dbr:Floian
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dbr:First_appearance_datum
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dbr:Barremian
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dbr:First_appearance_datum
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dbr:Ovatoryctocara
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dbr:First_appearance_datum
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dbr:Oxfordian_(stage)
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dbr:First_appearance_datum
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dbr:Paibian
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dbr:Cefn-cerig_road
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dbr:Diabasbrottet_Quarry
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dbr:Globigerinoides
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dbr:Guadalupian
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dbr:Gzhelian
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dbr:Hauterivian
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dbr:Hettangian
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dbr:Hirnantian
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dbr:Terreneuvian
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dbr:Tetragraptus_approximatus
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dbr:First_Appearance_Datum
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dbr:Artinskian
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dbr:Asselian
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dbr:Chattian
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dbr:Jiangshanian
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dbr:Jurassic
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dbr:Kaili_Formation
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dbr:Katian
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dbr:Kimmeridgian
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dbr:Ladinian
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dbr:Late_Cretaceous
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dbr:Late_Triassic
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dbr:Dob's_Linn
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dbr:Burdigalian
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dbr:Pliensbachian
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dbr:Iapetognathus
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dbr:Iapetognathus_fluctivagus
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dbr:Induan
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dbr:Kungurian
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dbr:Messinian
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dbr:Miaolingian
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dbr:Middle_Jurassic
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dbr:Middle_Triassic
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dbr:Neogene
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dbr:Oligocene
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dbr:Ordovician
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dbr:Serpukhovian
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dbr:Sheinwoodian
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dbr:Wordian
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dbr:Wuchiapingian
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dbr:Wuliuan
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dbr:First_appearance_datum
rdfs:label
First appearance datum
rdfs:comment
First appearance datum (FAD) is a term used by geologists and paleontologists to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest fossil discovered, to date, of a particular species. A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.
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dbc:Biostratigraphy dbc:Historical_geology
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2262370
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1116599691
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dbr:Stratigraphy dbr:Newfoundland_(island) dbr:Biostratigraphy dbr:Conodont dbr:Stratum dbr:Fossil dbr:Radiometric_dating dbr:Geologic_time_scale dbr:Tremadocian dbr:Ordovician dbr:Paleontology dbr:Global_Boundary_Stratotype_Section_and_Point dbr:Diachronism dbc:Biostratigraphy dbc:Historical_geology dbr:Geologist
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dbo:abstract
First appearance datum (FAD) is a term used by geologists and paleontologists to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest fossil discovered, to date, of a particular species. A related term is last appearance datum (LAD), the last appearance of a species in the geologic record. FADs are frequently used to designate segments in the geologic time scale. A given FAD can be used to define a Global Boundary Stratotype Section and Point (GSSP). For example, the beginning of the Tremadocian Stage of the Ordovician Period is marked by the first appearance of the conodont Iapetognathus fluctivagus in the geologic record. This occurs in bed 23 of the rock formation known as the Green Point section, located in western Newfoundland, as well as in geologically correlated strata in many parts of the world. However, diachronous FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances. Use of other data, such as radiometric data, may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.
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dbr:Norian
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