Baruungoyot Formation

The Baruungoyot Formation (also known as Barun Goyot) is a geological formation dating to the Late Cretaceous Period. It is located within and is widely represented in the Gobi Desert Basin, in the Ömnögovi Province of Mongolia.

It was previously known as the Lower Nemegt Beds occurring beneath the Nemegt Formation. The stratotype of the Baruungoyot Formation is the Khulsan locality, east of Nemegt. At Nemegt, only the uppermost barungoyotian beds are visible. The Red Beds of Khermeen Tsav are also considered part of the Baruungoyot Formation. It is approximately 110 metres (360 ft) in thickness. The Baruungoyot Formation preserves an environment of sand dunes, created from wind-eroded rocks (aeolian dunes). The formation is considered Maastrichtian in age. It has no contact with the Djadochta Formation but the presence of many overlapping animals suggests they are at least partially coeval.

An undescribed tyrannosaurid specimen is known from the formation.