Oolite
Sedimentary rock formed from spherical ooid grains.
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Oolite is a sedimentary rock, usually limestone, composed of ooids cemented together.[1] Ooids are spherical grains made of concentric layers, and in oolites they are 0.25–2 millimetres in diameter.[2] Rocks with ooids larger than 2 mm are called pisolites.[2]
Quick Facts
- Composition
- Calcium carbonate (calcite or aragonite)
- phosphate
- clays
- chert
- dolomite
- or iron minerals including hematite
- Grain size
- 0.25–2 mm (ooids); larger than 2 mm (0.079 in) called pisolites
- Formation environment
- Warm
- supersaturated
- shallow
- highly agitated marine intertidal environments; also inland lakes
- Notable locations
- Cotswold Hills, Isle of Portland, Miami Rock Ridge, Shoofly Oolite (Idaho), Indiana, Great Appalachian Valley
Facts from the source article.
Key facts and history
Oolitic limestone formed in England during the Jurassic period.[3] This rock forms the Cotswold Hills, the Isle of Portland with its Portland Stone, the Osmington Oolite, and part of the North York Moors.[3] The Shoofly Oolite is a section of the Glenns Ferry Formation.[4] The Shoofly Oolite, located within the Glenns Ferry Formation on the Snake River Plain of southwestern Idaho, ranks among the planet's most extensive freshwater lakebed oolites.[4]
What the research sources say
The Kansas Geological Survey states that oolite is a type of sedimentary rock, usually limestone, made up of ooids cemented together.[1]
References
- "Oolite", Kansas Geological Survey. facts only, no text reused. geokansas.ku.edu
- Wikipedia, "Oolite" (CC BY-SA 4.0), which cites: "A to Z of Rocks, Minerals and Gems", Quarto Publishing Group UK, 2020; "Oolite", Kansas Geological Survey (we also read that source) en.wikipedia.org
- Wikipedia, "Oolite" (CC BY-SA 4.0), which cites: Atkinson, "Rocks & Minerals", Bloomsbury, 1992, p. 161–162 (we also read that source) en.wikipedia.org
- Wikipedia, "Oolite" (CC BY-SA 4.0), which cites: "Mud Flat Oolite", www.blm.gov, 2015-05-28 (original not read by us) en.wikipedia.org
Each numbered sentence above was checked against the source it cites before publication. Sentences citing Wikipedia adapt text from the English Wikipedia article Oolite (contributors), used under CC BY-SA 4.0; this entry is available under the same licence. Other sources were used for facts only; no text or images are copied from them.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Oolite (CC BY-SA 4.0).
- Word definitions: the , each quoted from its Wikipedia article.
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