The BGS Lexicon of Named Rock Units — Result Details

Linley Formation

Computer Code: YSY Preferred Map Code: YSY
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Greenish grey shales, siltstones and very fine- to fine-grained sandstones. Local interbedded lapilli tuffs. Sandstones as thick homogeneous beds with sporadic normal grading, also as isolated beds 10cm to 2m thick displaying upward-fining trends.
Definition of Lower Boundary: Not known. Occurs as fault slivers adjacent to Pontesford-Linley Fault.
Definition of Upper Boundary: Not known.
Thickness: Not known.
Geographical Limits: Between Linley Big Wood and Knolls Farm, Norbury, Shropshire.
Parent Unit: Stretton Group (YST)
Previous Name(s): Portway Formation (PWG)
Alternative Name(s): none recorded or not applicable
Type Section  In vicinity of Linley Big Wood. 
Pauley J C. 1991. A revision of the stratigraphy of the Longmyndian Supergroup, Welsh Borderland, and of its relationship to the Uriconian volcanic complex. Geological Journal, Vol. 26, 167-183. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: