| Derfel Limestone | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Lithology | |
| Primary | Limestone |
| Location | |
| Region | Wales |
| Country |  United Kingdom |
The Derfel Limestone is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Llanfallteg Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period. It predominantly consists of ash containing siltstones, as wells as ash fall deposits and tuffs. It likely dates to the Darriwilian based on graptolites. The local graptolite fauna includes Didymograptus artus and Glossograptus armatus. The local trilobite fauna includes agnostids, phacopids and asaphids.
The Elton Beds is a geologic formation in England and Wales. It preserves fossils dating back to the Silurian period.
The Bala Group is a geologic group in Wales. It preserves fossils dating back to the Ordovician period.
The Woolhope Limestone is a geologic formation in Wales. It preserves fossils dating back to the Silurian period.
The Trefawr Formation is a geologic formation in Wales. It preserves fossils dating back to the Silurian period.
The Nant Ffrancon Fermation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Sholeshook Limestone is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Llanfawr Mudstones is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Dolhir Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Cymerig Limestone is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Rhiwlas Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Bryn Siltstone is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Senni Beds is the former name of the Senni Formation in Wales. It preserves fossils dating back to the Devonian period.
The St. Maughan's Formation is a geologic formation in Wales. It preserves fossils dating back to the Devonian period.
The Llanelly Formation is a geologic formation in Wales. It preserves fossils dating back to the Carboniferous period.
The Moel Hiraddug Limestone is a geologic formation in Wales. It preserves fossils dating back to the Carboniferous period.
The Spring Quarry Limestone is a geologic formation in Wales. It preserves fossils dating back to the Carboniferous period.
The Llanarmon Limestone is a geologic formation in Wales. It preserves fossils dating back to the Carboniferous period.
The High Tor Limestone is a geologic formation in Wales. It preserves fossils dating back to the Carboniferous period.
The Aran Volcanic Group is a geologic group in Wales. It preserves fossils dating back to the Ordovician period.
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