Beautiful fossil fern plate from the Carboniferous Period (Pennsylvanian), collected in the Llewellyn Formation of St. Clair, Pennsylvania, USA. This specimen displays crisp and well-defined impressions of Alethopteris grandinii, a classic seed fern admired for its elegant frond structure. The contrasting white mineralisation on the dark shale creates a strong visual effect, highlighting the delicate venation and natural arrangement of the foliage. Several fronds are clearly visible on the main slab, with additional impressions present on the accompanying split piece. A highly decorative and historically important fossil plant, perfect for collectors of palaeobotanical material. The plastic display stand is included.