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"Argillite" may also refer to Argillite, Kentucky.

An argillite () is a fine-grained sedimentary rock composed predominantly of indurated clay particles. Argillaceous rocks are basically lithified muds and oozes. They contain variable amounts of silt-sized particles. The argillites grade into shale when the fissile layering typical of shale is developed. Another name for poorly lithified argillites is mudstone. These rocks, although variable in composition, are typically high in aluminium and silica with variable alkali and alkaline earth cations. The term pelitic or pelite is often applied to these sediments and rocks. Metamorphism of argillites produces slate, phyllite, and pelitic schist.

Belt Supergroup

The Belt Supergroup of rocks is composed mainly of argillite, as well as other metamorphosed or semi-metamorphosed mudstones. This supergroup is mainly exposedin Western Montana, including the Bitterroot Valley and Bitterroot Mountains, Missoula area, Flathead Lake, and Glacier National Park, and is also exposed in parts of Northern Idaho, and British Columbia. Belt Supergroup rocks are also thought to be present in what is now Korea, Manchuria, and Eastern......
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