The Esperson dome is one of the early deep-seated salt domes discovered as a direct result of geophysical work. In 1928 it was found by torsion-balance exploration. In 1929 oil was discovered. Prior to March 1, 1934, forty-three wells were completed, including thirty-five oil wells. Seven producing horizons are in the Miocene and Oligocene formations. This dome is peculiar in that the salt mass has been thrust upward at an inclined angle leaning north of the vertical position. The crest formed by the arching of the beds above the salt mass moves horizontally with depth.