4.5 Polarity-chronostratigraphical units
4.5.1 General properties and rules
Polarity chronostratigraphy is concerned with chronostratigraphical classification of rocks and superficial deposits on the basis of their remanent-magnetic polarity properties (see Section 3.4).
A polarity-chronostratigraphical unit is a body of rock or superficial deposits that crystallized or was deposited during a certain interval of time characterized by a specific primary magnetic polarity. The magnetic polarity during this period must be identifiable in the lithological reference units. A reference unit of this sort will be a polarity zone in the magnetostratigraphical classification system (Section 3.4.2).
A polarity-chronostratigraphical unit is termed a polarity chronozone.