That the concentric layers within Ordovician ooids precipitated from seawater with a Mg:Ca ratio less than 2 is indicated by
A) concentric layers of aragonite around a nucleus.
B) elongate calcite crystals that radiate outward from the center.
C) a nucleus that may have been a pellet or small shell fragment.
D) spicules and other organic structures in the layers and nucleus.
Correct Answer:
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