[5][6][7] The environments that were present on the Bayan Shireh Formation consisted mainly on semi-arid climates with large water bodies, such as rivers or lakes.

[8][7] Although it is considered to be partially lacustrine,[9] largescale cross-stratification in many of the sandstone layers at the Baynshire locality seem to indicate that a large meandering fluvial system was present.

It has been implied that during the late Bayan Shirehnian times, large rivers with direct connections to the sea drained a prominent part of the eastern Gobi region.

[11] Based on comparisons with other formations, Jerzykiewicz and Russell suggested that the Bayan Shireh paleofauna seems to correspond best with the Turonian through early Campanian stages of the Late Cretaceous, about 93 to 80 million years ago.

[12] A potential correlation between the Iren Dabasu Formation has been long suggested by most authors, mainly based on the highly similar vertebrate assemblages.