Radiolarite

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Radiolarite (Jurassic) from the Alps
Radiolarite (Jurassic) from the Alps

Radiolarite is a high silica sedimentary rock which may be considered a variety of chert. It is formed as primary deposits and contains radiolarian microfossils. Radiolarite indicates deep water deposition below the lysocline where siliceous sediments are stable and carbonates are dissolved.

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