Final answer:
Coquina limestone is made entirely of shell fragments. It forms near coastlines over many years as seashell fragments get compressed together.
Step-by-step explanation:
The type of limestone that is composed entirely of shell fragments is typically referred to as Coquina. This variety of limestone is distinctive due to the noticeable pieces of seashell, often including larger shell fragments. Coquina forms near coastlines where the accumulation of shells occurs. Over many years, these shell fragments get compressed together, forming a type of limestone that is made entirely of shell fragments.
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