| First Appearance Datum (fad) |
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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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