A datumed section/surface. 1. A seismic record section (or volume) in which a particular event has been made flat (or sometimes merely smooth) by introducing arbitrary time shifts. If the event represents a bed that was deposited horizontally, the flattened section resembles a paleosection showing the attitude of deeper events at the time of deposition of the flattened bed; see Figure F-12. Useful in studies of variations in the time interval between events and sometimes used for static corrections. 2. A paleosection (q.v.).