Retrogradation

• Progradation – Growth of a river delta into the sea over time
• River delta – Silt deposition landform at the mouth of a river
• Aggradation – Increase in land elevation due to the deposition of sediment
• Marine transgression – Geologic event in which sea level rises relative to the land
• Marine regression – Geologic event in which sea level falls relative to the land
• Sedimentology – Study of natural sediments and their formation processes
• Stratigraphy – Study of rock layers and their formation
• Sequence stratigraphy – Study and analysis of groups of sedimentary deposits
• Sediment transport – Movement of solid particles, typically by gravity and fluid entrainment

Schlumberger Oilfield Glossary