limestone

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limestone

A rock formed of organic fossil remains of shells, composed mostly of calcium carbonate.
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References in periodicals archive ?
It was made from coralline limestone by hammer-dressing to a basically rectangular form and then roughly ground.
The Makekur tool stands apart from most other nut-cracking tools in the western Pacific region as it is made from coralline limestone, which is softer than the igneous and metamorphic rocks normally used (e.g.
Layer 2 represents the early Lapita occupation on a white coral beach sand or coralline limestone (Layer 3).