The BGS Lexicon of Named Rock Units — Result Details
Cerrig Gwynion Grits Facies (Caban Conglomerate Formation)
Computer Code: | CYG | Preferred Map Code: | CyG |
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Status Code: | Pending Upgrade | ||
Age range: | Hirnantian Age (OH) — Llandovery Epoch (SL) | ||
Lithological Description: | Medium- to coarse-grained, thick-bedded sandstones, pebbly in places. | ||
Definition of Lower Boundary: | No definition. | ||
Definition of Upper Boundary: | No definition. | ||
Thickness: | No definition. | ||
Geographical Limits: | Central Wales. | ||
Parent Unit: | Caban Conglomerate Formation (CBN) | ||
Previous Name(s): | Cerrig Gwynion Grits Member [Obsolete Name and Code: Use CYG]
(-3343)
Cerrigwynion Grits [Obsolete Name and Code: Use CYG] (-4582) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Rhayader Quarry. The quarry has quarried away the crags called Cerrig Gwynion after which Lapworth, (1900) named his original stratigraphic unit. | ||
Reference(s): | |||
Definition not published. | |||
Lapworth, H, 1900. The Silurian sequence at Rhayader. Quarterly Journal of the Geological Society, Vol.56, p.67-137. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E179 |