That point on a ridge at or nearest to the point of divergence of two type lines, and located at or directly in front of the point of divergence.
DELTA RULES:
1. When there are two or more possible bifurcation deltas which conform to the definition, the one nearest the core should be chosen.
2. The Delta may not be located in the middle of a ridge running between the type lines toward the core, but at the end nearest to the core.
3. The delta may not be located at a bifurcation which does not open toward the core.
4. Where there is a choice between a bifurcation and another type of delta, the bifurcation is selected.