Which term refers to warm carbonate sand grains formed by ooids?

• A. Nodule
• B. Oolite Sands
• C. Paleoceanography
• D. Piston Corer

Answer: (B)

Ooids form in warm, shallow, agitated marine waters where tiny calcium carbonate shells grow concentric layers around a nucleus. When these ooids accumulate and are ground down to sand-sized grains, the resulting sediment is called oolite sand. So the term for warm carbonate sand grains formed by ooids is oolite sands. The other terms refer to a carbonate concretion (nodule), the study of past oceans (paleoceanography), or a piece of equipment used to sample sediments (piston corer), not to ooid-derived sands.