English: Scanning electron microscope images of different types of giant magnetofossils from late Quaternary Bay of Bengal sediments. (a) Spearhead-shaped giant magnetofossil with circumferential feature and a long stalk. The spearhead-shaped giant magnetofossils is ~4760 nm in length and ~1060 nm in width. (b) A spindle-shaped giant magnetofossil on the surface of a large detrital magnetic mineral. The length and width of spindle-shaped giant magnetofossils is ~3000 nm and ~500 nm, respectively. (c) A giant bullet resting on the TEM copper grid measuring ~1500 nm in length and ~230 nm in width. (d), (e) Giant needles on the surface of other magnetic mineral phases. The length and width of the giant needles ranges from ~1000–1374 nm and ~120–150 nm. (f) A spindle shaped giant magnetofossil measuring ~2900 nm in length and ~480 nm in width. Red circle indicates the position where the energy dispersive X-ray spectra is obtained.