M. K. Jenyon
Journal of Petroleum Geology
Subaerial, and in some case submarine, erosional processes sometimes leave a depositional surface which is not plane. During any subsequent transgression and sedimentation, remnant relief on the old surface may be preserved, particularly where depositional rates during the early period of the transgression are high, and the environment energy of deposition is relatively low. As well as in circumstances involving normal clastic sediments, similar situations can arise in the inundation of a volcanic surface including relief features like vents, fissures and mounds, or of a karstified surface-carbonate unit.