Figure 9--Three-dimensional seismic user track line of Figure 7 shows details of the Edwards stratigraphy. The line location is also shown on Figure 3. Three wells located on the seismic line are correlated on the cross section of Figure 10. The Mobil 1 Kahanek well is projected from Word field approximately 13 mi (21 km) along the strike of the published Edwards margin. The Chevron 1 Coby well and the Exxon 1 Zaruba well are located on the line as is shown on Figure 7. The 112 Ma sequence boundary of Goldhammer et al. (1991) within the upper Sligo (equivalent to the boundary between sequences 5 and 6 on Figure 4) is picked toward the base of the seismic line. Four key small-scale sequence boundaries occurring within the Edwards are identified in the Coby well and correlated across the seismic line as reflectors 1–4. The Edwards sequences bounded by the four reflectors occur within sequence 9 of Figure 4. Reflector 4 is equivalent to the 98 Ma sequence boundary of Goldhammer et al. (1991). These four seismic sequence boundaries are the basis for the well correlation shown on Figure 10.