From Kurzanov, S.M., Bannikov, A.F., 1983. A new sauropod from the Upper Cretaceous of Mongolia. Paleontological Journal 1983, 90–96.:
"Therefore the discovery by the Combined Soviet-Mongolian Paleontological Expedition of an almost complete skull of a sauropod, belonging to the new genus Quaesitosaurus, is of particular interest. The skull was discovered in the western part of the Shara-Tsav bluffs, located 8 km to the north of the well-known Upper Cretaceous reptile locality at Bayshin-Tsav . The bluffs consist of mottled marls, clays, siltstones, sandstones, and grits of the Barungoyot Formation. Besides the Quaesitosaurus skull, the locality yielded a skeleton of the ornithomimid Gallimimus sp. and a substantial part of the skeleton of the theropod Avimimus portentosus , which also place the deposits in the Barungoyot."
Ref. 1: Kurzanov, S.M., 1981. О необычных тероподах из верхнего мела МНР [An unusual theropod from the Upper Cretaceous of Mongolia] (in Russian). Transactions of the Joint Soviet-Mongolian Paleontological Expedition 15, 39–50.
Ref. 2: Tsybin, Y.I., Kurzanov, S.M., 1979. [New data on Upper Cretaceous localities of vertebrates of the Baishin-Tsav region] (in Russian). Transactions of the Joint Soviet-Mongolian Paleontological Expedition 8, 108–112.