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...r weights, and other [[organic compound]]s, that are found in [[Formation (stratigraphy)|geologic formations]] beneath the [[Earth|Earth's]] surface. Petroleum i ...anadium]]. The exact molecular composition varies widely from formation to formation but the proportion of [[chemical element]]s vary over fairly narrow limits

...[[brachiopod]] shell visible in a [[limestone]] thin-section; Bird Spring Formation ([[Carboniferous]]) of southern Nevada.]] *Boggs, S., 2006 ''Principles of Sedimentology and Stratigraphy: Fourth Edition'', New Jersey, Pearson Prentice Hall, p. 165.

...uarry|quarried]] from the Selkirk member of the [[Ordovician]] [[Red River Formation]], in the vicinity of [[Tyndall, Manitoba|Tyndall]], [[Manitoba]], [[Canada [[Category:Stratigraphy of Manitoba]]

The formation of sandstone involves two principal stages. First, a layer or layers of san ...ically altered and physically compacted after deep burial of the sandstone formation.