Extended Data Fig. 2: Rock magnetism.
From: Hominin occupation of the Chinese Loess Plateau since about 2.1 million years ago
a, Temperature-dependent magnetization variations for four representative samples from the Shangchen section. Arrows indicate heating or cooling runs. These curves were obtained in air using a field of 100 mT, and indicate the presence of maghemite, dominant magnetite and haematite. This type of magnetic mineral assemblage is typical of that previously recovered for the Chinese loess–palaeosol sequence19,32. b, Hysteresis loops for representative samples after correction for paramagnetic slope. Ms, saturation magnetization; Mrs, saturation remanence; Bc, coercive force; and Bcr, coercivity of remanence. c, Anisotropy of magnetic susceptibility for 694 specimens from loess L5 to loess L28 in the main section that we studied, and parallel sections at the Shangchen locality. Left, Flinn diagram. L, lineation (κmax/κint). F, foliation (κint/κmin). Right, stereographic projections of anisotropy-of-magnetic-susceptibility ellipsoids of specimens. Data for κmax and κmin are shown as black squares and red circles, respectively. The data are indicative of normal, undisturbed sedimentary fabrics and support the magnetostratigraphic interpretation presented in this study. d, Equal area projections for the natural remanent (left) and characteristic remanent (right) magnetization directions for all 694 studied specimens.
