Fig. 2: Detailed rock magnetic stratigraphy (0–9.5 m).
From: Late Cambrian geomagnetic instability after the onset of inner core nucleation
a–e Changes in NRM, natural remanent magnetization (a), ARM, anhysteretic remanent magnetization (b), SIRM, saturation isothermal remanent magnetization (c), S-ratio (d), and ARM/SIRM (e) with stratigraphic height. S-ratio is defined as IRM acquired at 300 mT backfield over SIRM acquired at 1.0 T forward field. f, g NRM normalized by ARM and SIRM, respectively, as a crude relative paleointensity proxy. h Four intervals (I, II, III, IV) with different geomagnetic field behavior character documented in the studied section (see Fig. 3).
