According to the archaeological evidence, during the late 7th century through 10th century AD, some Naifeld-Culture Heishui Mohe migrated west of the range (to the section of the Amur Valley west of the Bureya River, and possibly also into the Nen River basin), absorbing the indigenous population of the area (which is evidenced e.g. by the presence of the ornaments associated with the autochthonous Mikhailovskaya Culture on the ceramics of the Neifeld Mohe people who had migrated into the Mikhailovskaya's former area). Modern researchers surmise that the migration of some of the Mohe people west of the range during the late 7th - early 8th century may have been caused by the pressure from the Balhae further south.