School of Earth Sciences and Key Laboratory of Mineral Resources in Western China(Gansu Province),Lanzhou University,Lanzhou 730000,China;
Key Laboratory of Western China’s Environmental Systems,Ministry of Education of China&College of Resources and Environment,Lanzhou University,Lanzhou,Gansu 730000,China;
Paleomagnetic Laboratory’Fort Hoofddijk’,Utrecht University,3584 CD Utrecht,The Netherlands;
Lab of Coast and Ocean Geology,Third Institute of Oceanography,State Oceanic Administration,Xiamen,361005,China;
State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710075,China;
State Key Laboratory of Biogeology and Environmental Geology and School of Ocean Sciences,China University of Geosciences,Beijing 100083,China;
magnetostratigraphy; geomagnetic; polarity; timescale; cyclostratigraphy; geologic; timescale; Ordovician;
