The BGS Lexicon of Named Rock Units — Result Details

Thurstaston Hard Sandstone Bed

Computer Code: THHB Preferred Map Code: ThHB
Status Code: Full
Age range: Early Triassic Epoch (TE) — Anisian Age (TA)
Lithological Description: Sandstone and pebbly sandstone, greyish-brown. Fine- to medium-grained, moderately- to poorly-sorted. Laterally impersistent. Very well cemented in comparison to sandstone units immediately above (Thurstaston Sandstone Member) and below (Wilmslow Sandstone Formation).
Definition of Lower Boundary: Taken at the base of a maximum 3m thick pebbly sandstone bed (the Thurstaston Hard Sandstone Bed), overlying pebble-free reddish-orange sandstone (Wilmslow Sandstone Formation).
Definition of Upper Boundary: Taken at the top of a maximum 3m thick pebbly sandstone bed (the Thurstaston Hard Sandstone Bed), underlying pebble-free reddish-orange sandstone (Thurstaston Sandstone Member).
Thickness: 0 to 3m
Geographical Limits: Wirral Peninsula, west of the Woodchurch Fault (Cheshire Basin).
Parent Unit: Thurstaston Sandstone Member (THUN)
Previous Name(s): Thin inconsistent bed of hard sandstone (-3081)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  A540, Thurstaston road cutting. 300-600m north of junction with Station Road and Thurstaston Road. 
Partial Type Section  Thurstaston Common, Thurstaston, Wirral. 
Reference(s):
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E096