The Barun Goyot Formation
, dating from the Late Cretaceous Period
, is located within and is widely represented in the Gobi Desert
basin, in the Ömnögovi Province
It was previously known as the "Lower Nemegt Beds", occurring beneath the Nemegt Formation and above the Djadokhta Formation. It is approximately 4 inches in thickness and was laid down roughly 80-71 mya, making it uncertain whether it should be classed as Campanian or Maastrichtian, although the latter is less likely. The Barun Goyot Formation preserves an environment of sand dunes, created from wind-eroded rocks (aeolian dunes).
Birds and other theropods