in a completely different process, magnetic grains in sediments may align with the magnetic field during or soon after deposition; this is known as "detrital remanent magnetization" (drm). if the magnetization is acquired as the grains are deposited, the result is a depositional detrital remanent magnetization (ddrm); if it is acquired soon after deposition, it is a post-depositional detrital remanent magnetization (pdrm).