Fugichnia
Fugichnia is an trace [fossil classification|ethological class] of trace fossil characterized as "escape burrows" that are formed as a result of organisms' attempts to escape burial in sudden high-sedimentation events like turbidity currents. The burrows are often marked with chevron patterns showing the upward direction the organisms were tunneling.
Image:CretaceousLockeia121911.jpg|thumb|Lockeia from the Dakota Formation. These are bivalve escape burrows.