Shelly phosphorite from the Aseri deposit, Estonia.
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Shelly phosphorite from the Aseri deposit, Estonia.

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

Shelly phosphorite from the Aseri deposit, Estonia.

Shell fragments display different degrees of alteration, up to the degradation of the apatite (right corner).
Dark laminae correspond to layers that originally contained organic matter and are often rich in pyrite.