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Chalk
Welcome to Stephen Hui Geological Museum
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Chalk: A biological limestone formed from shell debris
Chalk - Wikipedia
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DISCOVERING FOSSILS | What is chalk and how does it form?
Rock of ages: how chalk made England | Geology | The Guardian
Chalk: A biological limestone formed from shell debris
Chalk: A biological limestone formed from shell debris
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Chalk - Wikipedia
Chalk: Mineral information, data and localities.
Chalk: A biological limestone formed from shell debris