Small sedimentary grain that forms on shallow tropical seabeds
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Modern ooids from a beach on Joulter Cays, The Bahamas.Ooids on the surface of limestone; Carmel Formation (Middle Jurassic) of southern Utah, USA.A thin slice of calcitic ooids from the Carmel Formation, Middle Jurassic, of southern Utah, USA.
Ooids (from Ancient Greek ᾠόν (ōión) 'egg stone')[1] are small (commonly ≤2 mm in diameter), spheroidal, "coated" (layered) sedimentary grains, usually composed of calcium carbonate, but sometimes made up of iron- or phosphate-based minerals. Ooids usually form on the sea floor, most commonly in shallow tropical seas (around the Bahamas, for example, or in the Persian Gulf). After being buried under additional sediment, these ooid grains can be cemented together to form a sedimentary rock called an oolite. Oolites usually consist of calcium carbonate; these belong to the limestone rock family. Pisoids are similar to ooids, but are larger than 2 mm in diameter, often considerably larger, as with the pisoids in the hot springs at Carlsbad (Karlovy Vary) in the Czech Republic.
^A to Z of Rocks, Minerals and Gems. Quarto Publishing Group UK. 2020. ISBN 978-0-7112-5684-2.
Ooids (from Ancient Greek ᾠόν (ōión) 'egg stone') are small (commonly ≤2 mm in diameter), spheroidal, "coated" (layered) sedimentary grains, usually composed...
form by direct precipitation of calcium carbonate onto the ooid. Pisoliths are similar to ooids, but they are larger than 2 mm in diameter and tend to be...
from ooids, spherical grains composed of concentric layers. Strictly, oolites consist of ooids of diameter 0.25–2 millimetres; rocks composed of ooids larger...
coated with a thin layer of crystalline carbonate to form the cortex of the ooid. Compared to other types of sand formation that involve the weathering and...
are concretionary grains – typically of calcium carbonate which resemble ooids, but are more than 2 mm in diameter. These grains are approximately spherical...
constraints on the last aragonite–calcite sea transition from early Jurassic ooids". Facies. 64 (1): 3. Bibcode:2018Faci...64....3V. doi:10.1007/s10347-017-0516-x...
service Original issue discount, implicit interest on a discounted debt Ooid, sedimentary grains This disambiguation page lists articles associated with...
temperature about 3 °C (5.4 °F) and the salinity by 0.5 per cent. Cemented ooids are referred to as grapestone. Additionally, giant stromatolites are found...
carbonate. Carbonate hardgrounds were thus very common, along with calcitic ooids, calcitic cements, and invertebrate faunas with dominantly calcitic skeletons...
Petrographic evidence for these calcite sea conditions consists of calcitic ooids, lmc cements, hardgrounds, and rapid early seafloor aragonite dissolution...
colic disease; Lady Hwang died soon after. Myongjong sillok (in Korean). ͡ơƠ͡ıđ̊. 1989. "조선왕조실록". National Institute of Korean History. 을사사화 : 핏빛 조선 4대 사화...
sedimentary rock containing kerogen Oolite – Sedimentary rock formed from ooids Phosphorite – Sedimentary rock containing large amounts of phosphate minerals...
A photomicrograph of a thin section of a limestone with ooids. The largest is approximately 1.2 mm in diameter. The red object in the lower left is a...
aragonite or dolomite. Both the cement and the clasts (including fossils and ooids) of a carbonate sedimentary rock usually consist of carbonate minerals....
compressed over multiple layers forming structures in the limestone called ooids, which created permeable conditions that hold water. The Florida peninsula...
are conglomerate lenses with Liassic elements. Oblique stratification and ooid limestones are predominantly restricted to the area surrounding patch reefs...
and Aseri Formation). Below it is a 15-centimeter (5.9 in) layer of clayey ooid-containing limestone of the Silaoru Formation. Below it is a 130-centimeter...
mm upwards in size may be considered an allochem. Examples would include ooids, peloids, oncolites, pellets, fossil or pre-existing carbonate fragments...
grains. The grains consist of sand-size grains of either corals, shells, ooids, intraclasts, pellets, fragments of older limestones and dolomites, other...
around in the snow. Over time, countless billions of these balls, known as "ooids" or "ooliths" (from the Greek for "egg-shaped" or "egg-stone"), became partially...
"Giant" ooids of the Johnnie Formation in the Death Valley area, California, USA. Ooids are near-spheroidal calcium carbonate grains that accumulate around...
units that have been deposited under quite less active water conditions. Ooids are coated carbonate grains that have some sort of a nucleus-a bioclast...
R.; Eberli, Gregor P. (2019). "The Formation and Distribution of Modern Ooids on Great Bahama Bank". Annual Review of Marine Science. 11. Annual Reviews:...
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