How to use the trap classification scheme
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One geologic element may control the existence of a trap. These are pure stratigraphic, structural, or fluidic traps. But many traps are a combination of two or three geologic elements. In these traps, basic trapping elements occur in combination to provide the ultimate trapping mechanism. Classifying combination traps is a matter of deciding which are the primary, secondary, and, in some cases, tertiary controlling elements.