MAGNETOSTRATIGRAPHY OF THE LOWER CRETACEOUS HEKOU AND LIUPANSHAN GROUP IN NW CHINA AND ITS IMPLICATIONS FOR THE COMPOSITE OF THE CRETACEOUS NORMAL SUPERCHRON (CNS)

Shuang Dai1, Ningyun Yan1, Lingling Luo1, Hugh C Jenkyns2, Conall Mac Niocaill3, Yuhu Tang1, Dongxiang Peng1 and Wenjie Wang1, (1)Lanzhou University, Lanzhou, China, (2)University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, (3)University of Oxford, Earth Science, Oxford, United Kingdom