Figure 2--Schematic dip cross section of Cretaceous in onshore Texas highlights two important play types. One play in the upper Edwards involves the progradation of favorable reservoir facies between the position of the commonly recognized Edwards margin, which is coincident with Word field, to an ultimate position approximately 3 mi (4.8 km) seaward. Faults play a role in porosity development and hydrocarbon migration. The other play is wedges of downslope debris that are present immediately in front of the Sligo margin. These wedges may be analogous to those of the giant Poza Rica field, which occurs adjacent to the Golden Lane platform of Mexico.