The BGS Lexicon of Named Rock Units — Result Details

Hartshill Sandstone Formation

Computer Code: CQ Preferred Map Code: HtS
Status Code: Full
Age range: Comley Series (EC) — Comley Series (EC)
Lithological Description: Grey to maroon medium-grained sandstone, glauconitic in upper part. Mudstone present only as rare beds 0.10m thick, or as drapes to sandstone beds.
Definition of Lower Boundary: Sharp unconformable contact of coarse beds on weathered tuffaceous Precambrian rocks of the Caldecote Volcanic Formation. Basal beds are red breccias or grey conglomerates.
Definition of Upper Boundary: Sharp sedimentary break. Dark grey glauconitic sandstones of the formation are overlain by red mudstone of Purley Shale Formation.
Thickness: Thickness in the type area is 275m.
Geographical Limits: Known extent: from Nuneaton town centre, extending north-west for 5.2km to Worthington Farm (SP 3529 9197 - 3192 9572).
Parent Unit: Not Applicable (-)
Previous Name(s): Hartshill Formation (-3954)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Upper northern levels of Boons Quarry, 50m south-south-west of Grange Farm. 
Partial Type Section  Hartshill Quarry, south-east face and part of south-west face, 550m west-north-west of Hill Farm. 
Reference(s):
Brasier, M D, Hewitt, R A and Brasier, C J, 1978. On the late Precambrian - Early Cambrian Hartshill Formation of Warwickshire. Geological Magazine, Vol.115/1, p.21-36. 
Carney, J N, 1992. Geology and structure of the Lower Cambrian Hartshill Sandstone Formation: information from quarries north-west of Nuneaton. British Geological Survey Technical Report WA/92/08. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable