The BGS Lexicon of Named Rock Units — Result Details

Penarth Group
Computer Code: PNG Preferred Map Code: PnG
Status Code: Full
Age range: Rhaetian Age (TR) — Rhaetian Age (TR)
Lithological Description: Grey to black mudstones with subordinate limestones and sandstones; predominantly marine in origin.
Definition of Lower Boundary: At base of Westbury Formation, usually erosional, on the Blue Anchor Formation of the Mercia Mudstone Group.
Definition of Upper Boundary: At base of lowest formation in the Lias Group: Scunthorpe Mudstone Formation, Blue Lias Formation, Redcar Mudstone Formation etc; or 'Lower Lias'.
Thickness: 0- >12m.
Geographical Limits: United Kingdom, including Northern Ireland.
Parent Unit: Not Applicable (-)
Previous Name(s): Rhaetic, Lower [Obsolete Name And Code: Use WBY Or PNG] (LRRH)
Lower Rhaetic (-2374)
Rhaetic (-4842)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Cliff section, north of Penarth Head, Penarth. 
Partial Type Section  Cliff section, St Mary's Well Bay, Lavernock, c.3km south of Penarth. 
Reference Section  St.Fagans Borehole (Waters and Lawrence, 1987). 
Partial Type Section  Cliff section, south of Penarth Head, Penarth. 
Partial Type Section  Cliff section, north of Lavernock Point, Lavernock, c.3km south of Penarth. 
Reference(s):
Warrington, G, Audley-Charles, M G, Elliott, R E, Evans, W B, Ivimey-Cook, H C, Kent, P E, Robinson, P L, Shotton, F W, and Taylor, F M. 1980. A correlation of the Triassic rocks in the British Isles. Special Report of the Geological Society of London, No.13. 
Waters, R A and Lawrence, D J D, 1987. Geology of the South Wales Coalfield - Part III: the country around Cardiff. Memoir of the British Geological Survey, Sheet 263. (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E140 E184 E123 E263 E062 E043 E262 E199 N35 E279 E102 E055 E065 E064 E072 E080 E081 E089 E090 E091 E103 E115 E127 E128 E158 E172 E201 E142 E236 E237 E141 S043 E280 E281 E341 E342 E343 E264 E326 N28
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