Cross-section of a brachiopod from the shelly phosphorite of Estonia, former Ülgase mine
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Cross-section of a brachiopod from the shelly phosphorite of Estonia, former Ülgase mine

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

Cross-section of a relatively preserved brachiopod from the Tramadocian phosphorite formations of Estonia. The specimen still presents almost pristine laminae structures with high porosity (originally organic-rich layers) and few zones pyritised due the degradation of organic tissues and micro-redox conditions.