 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations .(February 2023) |
| Aran Volcanic Group | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Group |
| Location | |
| Country |  Wales |
The Aran Volcanic Group is a geologic group in Wales. It preserves fossils dating back to the Ordovician period.
The Conemaugh Group is a geologic group in West Virginia, Pennsylvania, Ohio, and Maryland. It preserves fossils dating back to the Carboniferous period.
The Cincinnati Group is a geologic group in Kentucky, Ohio and Indiana. It is Upper Ordovician.
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 Carmarthen Formation is a geologic formation in Wales and England. It preserves fossils dating back to the Ordovician period.
The Stockdale Shales is a geologic formation in England. It preserves fossils dating back to the Silurian period.
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 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 Derfel 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 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 High Tor Limestone is a geologic formation in Wales. It preserves fossils dating back to the Carboniferous period.
The Carmarthen Group is a geologic group in Wales. It preserves fossils dating back to the Ordovician period.
The Nant Hir Group is a geologic group in Wales. It preserves fossils dating back to the Ordovician period.
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