What is Ooid?
[[File:Ooids, Joulter Cays, Bahamas.jpg|thumb|Ooids]] [[File:OoidSurface01.jpg|thumb|right|Ooids on the surface of an oolite limestone. Carmel Formation ([[Middle Jurassic]]) of southern [[Utah]]]] [[File:CarmelOoids.jpg|thumb|left|Thin-section of calcitic ooids from an oolite]] An '''ooid''' is a small rounded [[sedimentary rock]]. Like sand grains, ooids have a diameter of 2 mm or less. Larger grains formed the same way as ooids are called ''pisoids''. Rock made of ooids is '''oolite'''.<ref>{{Cite web|title=Ooid Sand - Sandatlas|url=http://www.sandatlas.org/ooid-sand/|access-date=2022-04-16|website=www.sandatlas.org}}</ref> ==References== {{reflist}} [[Category:Sedimentary rocks]]