| Computer Code: |
SPRD |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Quaternary Period (Q)
— Quaternary Period (Q) |
| Lithological Description: |
Spreads are a class of landslide in which movement involves the fracturing and lateral extension of coherent material, either bedrock or soil, owing to liquefaction or plastic flow of subjacent material. The zone of failure is not a well-defined shear surface. The coherent upper units may subside into softer underlying material and in doing so may rotate, tilt and eventually disintegrate. The term 'spreads' may also be used generally to qualify the description of a wide range of areally extensive superficial deposits. |
| 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: |
Landslide deposits (SLIP)
|
| 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 |
