Conodont Caudicriodus angustus angustus （Steward et al. , 1956 ） and Catuticriodus 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...Conodont Caudicriodus angustus angustus （Steward et al. , 1956 ） and Catuticriodus 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 Beth 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.展开更多
文摘Conodont Caudicriodus angustus angustus （Steward et al. , 1956 ） and Catuticriodus 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 Beth 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.
