The Tracy Gas Field, discovered in 1934, originally produced gas from a structural closure in the Cretaceous Tracy Formation. The field is located on a large structure on the southwest side of the large Vernalis reverse fault. In 1990, a shallower pool was discovered in the Miocene Beepee Sand by Nahama & Weagant Energy Company. The Beepee Sand, interpreted to be a shallow marine bar deposit, traps gas as the result of a pinchout on the flank of the Tracy Anticline and was discovered using 2-D seismic data and amplitude with offset analysis. The Miocene pool has produced 2.8 BCF from five wells.