Recurving Ridges
If a recurving ridge tends to terminate on the opposite side of the impression from which it entered, it’s usually a tented arch rather than a loop. This is because a recurving ridge must touch or pass the imaginary line between the delta and core and at last tend to pass out toward the side from which it entered so that a ridge count of at least one can be obtained, for it to be classified as a loop.
Ridge Counting
The number of ridges intervening between the delta and the core is known as the ridge count. The idea is to count each ridge which crosses or touches an imaginary line drawn from the delta to the core. If there is a bifurcation of a ridge exactly at the point where the imaginary line would be drawn, two ridges are counted. If the line crosses an island, both sides are counted. And dots or fragments are counted as ridges only if they are as thick and heavy as the other nearby ridges.
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