The BGS Lexicon of Named Rock Units — Result Details

South Alwyn Valley Formation

Computer Code: SAV Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Quaternary Period (Q) — Quaternary Period (Q)
Lithological Description: Usually a very soft to soft, highly plastic silty clay with shell fragments and containing lenses/layers of sand, gravelly sand, gravel and sandy mud up to 10cm thick.
Definition of Lower Boundary: Lower limit : unconformity upon sediments of the Ferder and Cape Shore Formations.
Definition of Upper Boundary: Upper limit : seabed.
Thickness: 4 metres +. Up to 15 metres thick on seismic sections.
Geographical Limits: Not defined.
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