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.
bandybabboon's user avatar
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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-...
cphlewis's user avatar
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