The BGS Lexicon of Named Rock Units — Result Details
Cerrig Gwynion Grits Facies (Caban Conglomerate Formation)
| Computer Code: | CYG | Preferred Map Code: | CyG |
|---|---|---|---|
| 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): | Cerrigwynion Grits [Obsolete Name and Code: Use CYG]
(-4582)
Cerrig Gwynion Grits Member [Obsolete Name and Code: Use CYG] (-3343) |
||
| 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): | |||
| Lapworth, H, 1900. The Silurian sequence at Rhayader. Quarterly Journal of the Geological Society, Vol.56, p.67-137. | |||
| Definition not published. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E179 | |||