Detailed gravity study gives significant evidence about the size, shape and nature of the Gosses Bluff structure and contributes to the conclusion of a multi-disciplinary study that the circular disturbance was produced by meteorite impact. Assessment of regional and residual gravity fields confirms the symmetrical circular gravity low of amplitude 4.4 mGal and radius 10.8 km centred at the focus of energy release determined from shatter cone orientations. Interpretation of the residual gravity field shows that the low is caused by near-surface low-density material consistent with the astrobleme hypothesis. The lack of a significant net mass excess or deficit thousands of metres deep under the Bluff, is evidence against igneous intrusion or salt diapirism. The extent of arcuate troughs of low-density breccia covered by superficial deposits is shown in the gravity field. Re-interpretation of an accurately compiled regional gravity field suggests that the gravity gradient parallel to the northern margin of the Amadeus Basin should be re-appraised. The residual field of the region around the Bluff provides new data on structures of significance in the exploration for oil and gas. Gravity data do not support the existence of a deep-seated Gardiner-Tyler Anticline passing under the Bluff, as has been suggested from seismic data, in a coincidence pointed out by opponents of the impact hypothesis.