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Leadhills Supergroup
The Leadhills Supergroup, formerly the Leadhills Group is a geological formation in Scotland. The Supergroup (geology), Supergroup is named after the village of Leadhills. Palaeoflow direction obtained from the horizons of the Corsewell Pont Conglomerate and the Glenn App Conglomerate indicates derivation from the north-west, presumed to be the Midland Valley arc. Dates of detrital muscovite and garnet are ''c.'' 480-460 Ma, indicating an origin from metamorphic activity during the exhumation of the Dalradian Supergroup after the Grampian Orogeny Composition Greywackes, shales, siltstones and mudstones with conglomerate (geology), conglomerates. Eras Abereiddian Age to Ashgill Epoch Boundaries The south-eastern boundary is the Orlock Bridge Fault. References Geologic supergroups of the United Kingdom Stratigraphy of Scotland Geography of South Lanarkshire Leadhills {{UK-geologic-formation-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob Wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
