| Bala Group | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Group |
| Location | |
| Region | Wales |
| Country | United Kingdom |
The Bala Group is a geologic group in Wales. It preserves fossils dated to the Ordovician period.
The Detroit River Group is a geologic group in Michigan and Ohio. It preserves fossils dating back to the Devonian 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 Stockdale Shales is a geologic formation in England. 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 Nant Hir Formation 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 Dolhir Formation 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 Spring Quarry 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 dated to the Ordovician period.
The Nant Hir Group is a geologic group in Wales. It preserves fossils dated to the Ordovician period.
The Aran Volcanic Group is a geologic group in Wales. It preserves fossils dated to the Ordovician period.
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