We classify a trap formally by listing the regimes, classes, and families for the primary, secondary, and (if necessary) tertiary systems. For example, the diagram below shows the formal classification for Upper Valley field.
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[[file:classification-of-exploration-traps_fig2-4.png|thumb|{{figure number|2-4}}See text for explanation.]]
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[[file:classification-of-exploration-traps_fig2-4.png|thumb|{{figure number|2}}See text for explanation.]]
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We classify a trap formally by listing the regimes, classes, and families for the primary, secondary, and (if necessary) tertiary systems. For example, the diagram in [[:file:classification-of-exploration-traps_fig2-4.png|figure 2]] shows the formal classification for Upper Valley field.