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See oolith.

[o(o)- + -oid.]
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They described the Type 2 mounds associated with high-energy ooid and skeletal/ooid shoal complexes, where they formed as "isolatedpatch reefs or laterally continuos biostromal bodies in rather restricted back-shoal settings".
Many ooids and other grains have been broken, and show changes in colour from alternating concentric ooid laminae and micritic laminae.
When it is low tide - one gets a better glimpse of the Ooid shoals as they are more exposed.
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.
The oolitic strata at the base of the outcrop are interpreted as the uppermost part of an ooid shoal.
The effects of burial diagenesis have been studied on porosity evolution of the Upper Jurassic Smackover Formation ooid grainstones, buried to a depth of over 6 km at Black Creek Field, Mississippi.
The grainstone is composed of about 80 percent ooids nucleated on a variety of bioclasts that include crinozoans, bryozoans, trilobites and ostracodes.
Rippled peloidal packstone facies (F2B) is formed by fecal pellets (50-100 [micro]m), minor micritic intraclasts (50-500 [micro]m), quartz grains (10-15%), scarce small agglutinated forams and miliolids, scarce highly fragmented fossil remains (bivalves, echinoderms and serpulids) and scarce ooids.