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・ First and Second Battles of Wonju
・ First and Third Trinity Boat Club
・ First and Third Trinity Boat Club May Ball
・ First Anglo-Afghan War
・ First Anglo-Burmese War
・ First Anglo-Dutch War
・ First Anglo-Maratha War
・ First Anglo-Mysore War
・ First Anglo-Sikh War
・ First Anniversary (The Outer Limits)
・ First Annual National Championship
・ First APC Philadelfi road ambush
・ First Apocalypse of James
・ First Apology of Justin Martyr
・ First appearance
First appearance datum
・ First Appearances
・ First arch syndrome
・ First Arena
・ First Armenian Evangelical Church
・ First Army
・ First Army (Austria-Hungary)
・ First Army (Bulgaria)
・ First Army (France)
・ First Army (Greece)
・ First Army (Home Forces)
・ First Army (Hungary)
・ First Army (Italy)
・ First Army (Japan)
・ First Army (Ottoman Empire)


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First appearance datum : ウィキペディア英語版
First appearance datum

First appearance datum is a term used by geologists and paleontologists to designate the first (oldest) appearance of a species in the geologic record. In other words, FADs represent the geologically oldest fossil of a particular species that has so far been discovered.
FADs are frequently used to designate segments in the Geologic time scale. For example, the beginning of the Tremadocian Stage of the Ordovician Period is marked by the first appearance (FAD) 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.



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