Rockworks 16 stratigraphy model problem in RockWorks Posted April 16 Control points are the known depths of the formation top and bottom. You get these from borehole data, ideally although you could create an imaginary well from a good cross section. With one or more imaginary wells well you can “define” the depth of the Proterozoic at different locations on your grid. Also it looks like there is a gap between the Cretaceous and the Proterozoic in your block model that you may need to look at. Best Regards.