Computer Code: |
MADD |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Quaternary Period (Q)
— Quaternary Period (Q) |
Lithological Description: |
Marine deltaic deposits comprise a coarsening upward sequence of sediments laid down in a prograding delta at the fluvial-marine boundary as the fluvial current velocity is dissipated. The deposits comprise sand, silt and clay. Deltas can be subdivided into fluvial-, wave- and tidal-dominated depositional environments each of which has a characteristic morphology. Progradation gives rise to topset, foreset and bottomset beds. |
Definition of Lower Boundary: |
none recorded or not applicable
|
Definition of Upper Boundary: |
none recorded or not applicable
|
Thickness: |
none recorded or not applicable
|
Geographical Limits: |
none recorded or not applicable
|
Parent Unit: |
Marine deposits (MDU)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
McMillan, A A and Powell, J H. 1999. The classification of artificial (man made) ground and natural superficial deposits. British Geological Survey Research Report, RR/99/04. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |