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A collection of four polished natural history specimens featuring pyritized ammonites, likely Dactylioceras sp. or similar Jurassic species, encased in a dark mineralised matrix. The group comprises a matching split nodule forming a part and counterpart, and two individual egg-shaped nodules. The ammonites exhibit a distinctive brassy metallic lustre resulting from pyritization, which provides a sharp visual contrast against the deep black mudstone or shale matrix. Each specimen has been shaped and polished on its exterior surfaces to a high-gloss finish. These fossils are characteristic of the Upper Lias formations of the Yorkshire coast, UK, particularly those found near Whitby.
Larger split specimen: approximately 80mm – 100mm in width
Smaller nodules: approximately 40mm – 60mm in length.
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