Argillite

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For the place, see Argillite, Kentucky.
Argillite
Sedimentary rock
A piece of black argillite from Haida Gwaii, Canada
Composition
indurated clay particles
Grey chunks of graptolitic argillite on Pakri Peninsula, Estonia; yellowish and white chunks are limestone

Argillite (

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, an assemblage of rocks of late Precambrian (Mesoproterozoic) age, includes thick sequences of argillite, as well as other metamorphosed or semi-metamorphosed mudstones.[1] It is exposed primarily in western Montana, including the Bitterroot Valley and Bitterroot Mountains, the Missoula area, Flathead Lake, and Glacier National Park, and in northern Idaho. There are also minor occurrences in northeastern Washington and western Wyoming.[2] Excellent outcrops of deep purple, wine red, red, blue, turquoise, and green argillites of the Belt Supergroup can be seen in Glacier National Park in northwestern Montana and in Wolf Creek Canyon along Interstate 15 in west-central Montana.[3]

"Black slate"

Main article: Haida argillite carvings

The

Skidegate on Graham Island. At one time, around 1900, it was shipped to Victoria for manufacturing; today the Haida have a monopoly on use of the argillite. Argillite carvings are synonymous with Haida artwork and are one of the few art forms on the Northwest Coast
that is the exclusive right of one cultural group. This artwork has been of high quality and prized around the world since the Haida first began carving it to trade and sell to sailors around 1800. Contemporary Haida carvers continue the tradition.

See also

  • Mudrock – Type of sedimentary rock
  • Catlinite – Metamorphosed mudstone, usually brownish red in colour
  • Lutite – Old terminology for clayey sedimentary rock

References

Wikimedia Commons has media related to Argillite.
  1. ^ Schieber, J. 1990. Significance of styles of epicontinental shale sedimentation in the Belt basin, Mid-Proterozoic of Montana, U.S.A. Sedimentary Geology, v. 69, p. 297-312.
  2. ^ Lori Tapanila and Paul Link. "Mesoproterozoic Belt Supergroup". Digital Geology of Idaho. Idaho State University, Department of Geosciences. Archived from the original on 5 December 2019. Retrieved 16 September 2016.
  3. ISBN 0-87842-202-1
    .
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