Pyritised brachiopod shell fragment from the Toolse phosphorite deposit, Estonia.
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Pyritised brachiopod shell fragment from the Toolse phosphorite deposit, Estonia.

by Sophie Graul, Tallinn University of Technology, Tallinn, Estonia and France

Pyritised brachiopod shell fragment from the Toolse phosphorite deposit, Estonia.
The pyrite micro crystallisations tend to develop due to the breakdown of organic matter during diagenesis.
Sample from the Suurjõgi Member, Kallavere Formation, Tremadocian.