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SHRIMP U-Pb dating for a K-bentonite bed in the Tieling Formation,North China[J]. SU WenBo1,LI HuaiKun2,HUFF W D3,ETTENSOHN F R4,ZHANG ShiHong1,ZHOU HongYing2 & WAN YuSheng5 1 School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;2 Tianjin Institute of Geology and Mineral Resources,China Geological Survey,Tianjin 300170,China;3 Department of Geology,University of Cincinnati,Cincinnati,OH 45221-0013,USA;4 Department of Earth and Environment Sciences,