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