| Dolhir Formation | |
|---|---|
| Stratigraphic range: Ashgill Series | |
| Type | Formation |
| Underlies | Mudstones of the Fron Frys Formation. |
| Overlies | Unconformable on various Caradoc Formations. |
| Thickness | 490 metres. Lateral variations, 320 - 490 metres. |
| Location | |
| Region | Wales |
| Country |  United Kingdom |
| Extent | Not defined |
The Dolhir Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Everton Formation is a geologic formation in northern Arkansas that dates to the middle Ordovician Period. Unconformities separate this formation from the underlying Powell Formation and the overlying St. Peter Sandstone Formation. Named for the town of Everton in Boone County, Arkansas in 1907, the Everton Formation is composed primarily of dolomite, limestone, and sandstone.
The Windrow Formation is a geologic formation in Minnesota named after Windrow Bluff on Fort McCoy, Monroe County, Wisconsin. It preserves fossils dating back to the Cretaceous period.
The Wind River Formation is a geologic formation in Wyoming in the Wind River Basin. It preserves fossils dating back to the Paleogene period. A recent study by Stanford suggests that fracking has contaminated the entire ground water resource in the basin.
The Brigus Formation is a fossiliferous upper lower Cambrian geologic formation in Newfoundland and Labrador.
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 Leintwardine Beds is a geologic formation in England. It preserves marine fossils, notably of the brachiopod Lingula, dating back to the Ludlow stage of the late Silurian period.
The Trefawr Formation is a geologic formation in Wales. It preserves fossils dating back to the Silurian period.
The Treiorwerth Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Wenallt Formation is a geologic formation near Garth in Powys, Wales. It preserves fossils dating back to the Ordovician 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 Llanfawr Mudstones is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Gelli 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 Llyn y Gafr Formation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.
The Bod Deiniol Formation 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 Foel Formation is a geologic formation in Wales. It preserves fossils dating back to the Carboniferous period.
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