The BGS Lexicon of Named Rock Units — Result Details

Aston Mudstone Formation

Computer Code: AST Preferred Map Code: AST
Status Code: Pending Upgrade
Age range: Homerian Age (SH) — Gorstian Age (SG)
Lithological Description: Grey thickly bedded (blocky) mudstone, commonly bioturbated.
Definition of Lower Boundary: Upwards change in lithology for grey well-bedded (shaly) mudstone to grey thickly bedded (blocky) mudstone.
Definition of Upper Boundary: See Bishopsmoat Beds, Lower.
Thickness: c.100m (lateral variations from about 100 - 275m).
Geographical Limits: Not defined.
Parent Unit: Not Applicable (-)
Previous Name(s): Aston Beds (-31)
Alternative Name(s): none recorded or not applicable
Type Area  Sheet 165. 
Allender, R, Not published. On the stratigraphy and structure of an area of Ludlowian and Lower Downtonian near Bishops Castle, Shropshire. Ph.D. Thesis (1959) University of Wales. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: