Cut drill core section of Estonian phosphorite
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Cut drill core section of Estonian phosphorite

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

Cut section of shelly phosphorites from the Aseri deposit.
Shelly phosphorites are Lower Ordovican formation, which consist of remnants of brachiopods in sandstone.

https://doi.org/10.1016/j.gexplo.2023.107311