The BGS Lexicon of Named Rock Units — Result Details
Alluvial fan deposits
| Computer Code: | ALF | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Quaternary Period (Q) — Quaternary Period (Q) | ||
| Lithological Description: | Alluvial fan deposits are low, outspread, relatively flat to gently sloping masses of loose rock material, shaped like a fan or segment of a cone. They are deposited by streams at the mouths of tributary valleys onto a plain or broad valley. Synonym: alluvial cone. | ||
| 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: | Fluvial deposits (FLUV) | ||
| Previous Name(s): | Alluvial cone [Obsolete Name and Code: Use ALF]
(ALC)
Alluvial delta [Obsolete Name and Code: Use ALF] (ALD) Alluvial fan [Obsolete Name and Code: Use ALF] (-10) |
||
| 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: | |||
| E221 S015 S023 S095 E014 S037 S037 S031 S031 E300 E078 E070 E077 E181 E323 E022 E024 E028 E048 S023 S032 S032 S056 S084 S030 S038 S039 S039 S096 S064 S064 S074 S074 S071 S072 S076 S080 S082 S044 S082 S084 S092 S092 S101 S093 S093 S101 S053 S096 S054 S054 S102 S102 S103 S103 S108 S109 S061 S109 S115 S117 S119 S052 S052 S061 S062 S131 E281 E246 E326 E096 E214 | |||