Oolite

Ooids on the surface of a limestone; Carmel Formation (Middle Jurassic) of southern Utah

Thin-section of calcitic ooids from an oolite within the Carmel Formation (Middle Jurassic) of southern Utah

Oolite or oölite (from Ancient Greek ᾠόν (ōión) 'egg stone')^[1] is a sedimentary rock formed from ooids, spherical grains composed of concentric layers.^[2] Strictly, oolites consist of ooids of diameter 0.25–2 millimetres; rocks composed of ooids larger than 2 mm are called pisolites. The term oolith can refer to oolite or individual ooids.

^ A to Z of Rocks, Minerals and Gems. Quarto Publishing Group UK. 2020. ISBN 978-0-7112-5684-2.
^ "Oolite". Kansas Geological Survey. Retrieved October 8, 2021.

[1] A to Z of Rocks, Minerals and Gems. Quarto Publishing Group UK. 2020. ISBN 978-0-7112-5684-2.

[2] "Oolite". Kansas Geological Survey. Retrieved October 8, 2021.

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