Carbonate-cemented shells in Estonian phosphorites, from the Toolse deposit
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Carbonate-cemented shells in Estonian phosphorites, from the Toolse deposit

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

Section of carbonate-cemented shells in Estonian phosphorites, from the Toolse deposit, Lääne-Virumaa district.

Shells are mineralised in CAF-apatite. Those most altered by diagenesis acquire a dark colour and are covered with micro-pyrites, mostly on the laminae that previously held organic matter.