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Mount Toondina crater
Mt Toondina crater.jpg
Landsat image of Mount Toondina crater; screen capture from the NASA World Wind
Impact crater/structure
Confidence Confirmed
Diameter 4 km (2.5 mi)
Rise 114 m (374 ft)
Age <110 Ma
<Early Cretaceous
Exposed Yes
Drilled No
Location Eromanga Basin
Coordinates 27°56′40″S 135°21′30″E / 27.94444°S 135.35833°E / -27.94444; 135.35833
Country Australia
State South Australia
District Allandale Station
Mount Toondina crater is located in South Australia
Mount Toondina crater
Location in South Australia

Mount Toondina crater is an impact structure (or astrobleme), the eroded remnant of a former impact crater, located in northern South Australia in the locality of Allandale Station about 24 km (15 mi) south of the town of Oodnadatta. Mount Toondina is the high point of a circular topographic feature rising out of an otherwise relatively flat desert area of the Eromanga Basin. An impact origin was first suggested in 1976, challenging the earlier diapir (salt dome) hypothesis, and strongly supported by subsequent studies. A geophysical survey using gravity methods indicates an internal structure typical of complex impact craters, including an uplifted centre, and suggests that the original crater was about 3–4 km in diameter. The crater must be younger than the Early Cretaceous age of the rocks in which it is situated, but otherwise is not well dated. It has clearly undergone significant erosion since the impact event.

  • Halihan, T., Dressler, A., Love, A., Xie, Y., Simmons, C. T., et al., Numerical and hydrogeophysical model of Mount Toonsina impact crater, South Australia. (Abstract). Geological Society of America, vol. 44, pp. 535. 2012
  • Moorcroft, E., Geophysical investigation, Mt. Toondina area. Quarterly Geological Notes, The Geological Survey of South Australia, v. 12, pp. 3–6. 1964
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