Locharbriggs Sandstone Formation
The Locharbriggs Sandstone Formation is a geological formation, formation of Cisuralian age (Early Permian). It consists of a 1000 m thick sequence of very Sorting (geology), well-sorted aeolian processes, aeolian sandstones, with well developed dune cross-bedding. The sandstone was used as a building stone in Dumfries, Edinburgh, Glasgow and New York (including the steps of the Statue of Liberty). References

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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 (geology), 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 ...
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