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Geology Dictionary

Geological Terms Beginning With "D"

For terms beginning with other letters, please click below A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Datum A reference location or elevation which is used as a starting point for subsequent measurements. Sea level is a datum for elevation measurements. Datums can also be arbitrary such as the starting point for stream stage measurements or based upon a physical feature such as the base of a rock unit.
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