The BGS Lexicon of Named Rock Units — Result Details

Older Alluvium [Continued Use Not Recommended: See ALV1]

Computer Code: OAL Preferred Map Code: notEntered
Status Code: Index Level
Age range: Quaternary Period (Q) — Quaternary Period (Q)
Lithological Description: Normally soft to firm consolidated, compressible silty clay, but can contain layers of silt, sand, peat and a basal gravel. A stronger, desiccated surface zone may be present. [Generic description]. Older than "Alluvium" in the same map area.
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: Not Entered (?)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable