Figure F30. Examples of samples that may contain superparamagnetic grains. Normalized NRM decay spectra (A, C) suggest SD-like behavior, whereas Lowrie-Fuller tests (B, D) (Lowrie and Fuller, 1971) conducted on these samples suggest multidomain (MD) behavior. A, B. Sample 197-1205A-20R-6, 12-14 cm. C, D. Sample 197-1205A-35R-2, 36-38 cm. ARM = anhysteric remanent magnetization, SIRM = saturation remanent magnetization, AF = alternating field.