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See oolith.

[o(o)- + -oid.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Facies analysis allowed the definition of eight facies from proximal to distal settings, with different proportion of skeletal and non-skeletal components (ooids, peloids, intraclasts and oncoids).
This ooid grainstone microfacies corresponds to Wilson's (1975) Standard Microfacies Types (SMF) 15, which is equivalent of RMF 29 (Flugel,2004).
This facies forms the first division of carbonate turbidites in the Cutri Formation, which is transitional with graded peloidal ooid packstones forming the rest of the Lowe sequence.
Found mostly in shallow tropical seas like the in Bahamas, the ooids are a rare occurrence in the coastal waters of the Arabian Gulf.
The second interesting insight Raman spectroscopy provides is that the fluorescence of the sample varies within the ooids and between regions of the cement, and allows multiple phases of ooid growth and cementation to be identified, which is depicted in Figure 3d,e.
The rock contains ellipsoidal ooid grains that are fully dolomitized to two distinct crystallite phases: a thin isopachous layer (rims of the elliptical ooids) and the inner core.
Rugose corals colonized the hard substrate at the top of the ooid shoal.