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Questions tagged [chalk]

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What is this stratefied limestone sphere?

What is this stone from the alps of provence? It's two spheres, one of them is made of at least 25 layers.
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Where did the other parts of coccoliths go, if not in chalk?

It took a lot of algae shells to make a chalk deposit, and one finds fossils of bigger organisms in them, and the flints/cherts where silicates ?condensed? during lithification. But where did the non-...