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Conodont Caudicriodus angustus angustus(Steward et al.,1956) and Caudicriodus angustus cauda(Wang et al.,2005) were found from a big limestone lens of the Berh Hairhan Formation in the place of W 150 km to Ulaanbaatar City.The discovery indicates that the Berh Haihan Formation should be assigned to Middle Devonian Eifelian Stage.This conodont fauna was from a shallow cooler water facies in the relatively high latitude.
Conodont Caudicriodus angustus angustus (Steward et al., 1956) and Caudicriodus angustus cauda (Wang et al., 2005) were found from a big limestone lens of the Berh Hairhan Formation in the place of W 150 km to Ulaanbaatar City. that the Berh Haihan Formation should be assigned to Middle Devonian Eifelian Stage. This conodont fauna was from a shallow coaster water facies in the relatively high latitude.