The BGS Lexicon of Named Rock Units — Result Details
Glyn Formation
Computer Code: | GYN | Preferred Map Code: | GyN |
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Status Code: | Full | ||
Age range: | Rawtheyan Stage (OW) — Hirnantian Age (OH) | ||
Lithological Description: | Fine- to coarse-grained sandstones and thin siltstones; a locally developed limestone member (Glyn Limestone) at base on Mynydd Fron Frys. | ||
Definition of Lower Boundary: | Top of underlying micaceous siltstones and mudstones of the Dolhir or Cyrn-y-Brain Beds. | ||
Definition of Upper Boundary: | Overlain by shales and slates of the Fron Frys Formation. | ||
Thickness: | 21-70m | ||
Geographical Limits: | Glyn Ceiriog and Llanelidan-Eglwyseg area of east Wales. | ||
Parent Unit: | Not Applicable (-) | ||
Previous Name(s): | Glyn Grit And Limestone [Obsolete Name And Code: See GYN]
(GLG)
Glyn Grit [Obsolete Name and Code: Use GYN] (-4077) |
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Alternative Name(s): | Corwen Grit Member |
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Stratotypes: | |||
Type Area | Type area around Glyn Ceiriog. Section on Mynydd Fron Frys, south east of Glyn Ceiriog. | ||
Reference(s): | |||
Hiller, A, 1981. The Ashgill rock of the Glyn Ceiriog district, north Wales. Geological Journal, Vol.16, p.181-200. | |||
Groom, T, Lake, P, 1908. Glyn Grit. Quarterly Journal of the Geological Society, Vol.64. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E121 E120 E137 |