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RockWorks15 Borehole Manager Zero-Thickness Formations One method of noting a missing formation is to assign the formation top an elevation that results in zero thickness. This formation would not appear in individual strip logs. It would be displayed in hole to hole stratigraphy sections (Stratigraphy / Section / Straight) as pinched out at the well, with pattern fill. The formation’s depths for that borehole would be included in computations that generate surfaces and thickness calculations. Note that in this stratigraphic model, the red surface is pulled up to lie on top of the lower surface. 73