 
Western NSW, Australia
32.2 S, 149.2 E
  Lava-field province
  Extinct volcano
Dubbo volcano comprises a number of volcanic areas including Macquarie River near Dubbo, the upper Goulburn River 130
  km to the east, Valley-filling lavas also occur 80 km east of Dubbo in the valley of Wyandra Creek near Gulgong.
Further reading
  Wellman, P. and McDougall, I., 1974. Potassium‐argon ages on the Cainozoic volcanic rocks of New South Wales. Journal of the Geological Society of Australia, 21(3), pp.247-272.  
12-15 million years ago