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Shell

Micro textures of Estonian shelly phsophorites Sophie Graul

Close-up of shelly phosphorite: elongated grey brachiopod shell fragments with fine wavy bands, set in a white crystalline cement, with clusters of dark grains on the right. — Shelly phosphorites from the Aseri deposit. Sophie Graul

Thin-section micrograph of shelly phosphorite: long dark olive and brown shell fragments in parallel streaks, surrounded by small rounded quartz grains in pale blue, grey and pink. — Thin section in PPL of shelly phosphorite from the Ülgase deposit, Estonia. Sophie Graul

Thin-section micrograph of shelly phosphorite: many brown, finely striped shell fragments, long and curved or short and blocky, packed between clusters of clear crackled quartz grains. — Thin section in PPL of shelly phosphorite from the Ülgase deposit, Estonia. Sophie Graul

Close-up of a large grey brachiopod shell fragment with fine dark parallel lines, among smaller banded shell pieces and glassy grains in a white crystalline matrix. — Shelly phosphorite from the Aseri deposit, Estonia. Sophie Graul

Close-up of an elongated dark blue-grey shell fragment with fine glittering dark bands, surrounded by clear glassy quartz grains and a pale cement. — Pyritised brachiopod shell fragment from the Toolse phosphorite deposit, Estonia. Sophie Graul

Close-up of a long, dark grey shell fragment with fine pale stripes and thin glittering lines, beside a clear rounded quartz grain and surrounded by smaller glassy grains. — Pyritised shell fragment from the Toolse phosphorite deposit, Estonia Sophie Graul

Studying shell morphodynamics to improve climate models Jennifer Guarini

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