The BGS Lexicon of Named Rock Units — Result Details

Huckster Conglomerate Member

Computer Code: HCG Preferred Map Code: notEntered
Status Code: Full
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: A massive conglomerate with subordinate pebbly sandstone. The conglomerate is generally composed of clasts of white quartzite in a red-brown sandstone matrix.
Definition of Lower Boundary: Taken at the relatively sharp, but conformable contact with the underlying purple shaly mudstones and siltstones of the Lightspout Formation.
Definition of Upper Boundary: Poorly exposed, but taken at the conformable transition from conglomerate and coarse pebbly sandstone into the purple siltstones and sandstones of the main part of the Portway Formation.
Thickness: Up to 18 m thick.
Geographical Limits: Welsh Borderlands, Church Stretton and the Long Mynd.
Parent Unit: Portway Formation (PWG)
Previous Name(s): Huckster Conglomerate [Obsolete Code: Use HCG] (YSPH)
Alternative Name(s): Narnells Grit
Stratotypes:
Partial Type Section  Huxter Stone, 135 m south southeast of Handless Farm (SO 397 900). Greig D C et al., 1968. 
Reference(s):
Greig D C, Wright, J E, Hains, B A and Mitchell, G H. 1968. Geology of the country around Church Stretton, Craven Arms, Wenlock Edge and Brown Clee. Memoir of the Geological Survey, Sheet 166 (England and Wales). (London: H.M.S.O.). 379pp. 
Lapworth C and Watts W W. 1910. Shropshire. 739-769 in Geology in the field; the Jubilee Volume of the Geologists' Association (1858-1908). Monckton H W and Herries R S (editors). (London: Edward Stanford). 
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. 
Pauley J C. 1990. The Longmyndian Supergroup and related Precambrian sediments of England and Wales. 5-27 in Avalonian and Cadomain geology of the North Atlantic. Strachan R A and Taylor G K (editors). (Glasgow: Blackie). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E166