Equilibrichnia:[7] burrows within the sediment that show evidence for organisms' responses to variations in sedimentation rate (i.e. the burrow moves upwards to avoid burial, or downwards to avoid exposure). Typically this evidence will be in the form of spreiten, which are small laminations in the sediment that reflect previous positions the organisms were in. Fugichnia:[8] "escape traces" that are formed as a result of organisms' attempts to escape burial in sudden high-sedimentation events like turbidity currents.