Figure 3. Left valve of Aequipecten opercularis specimen SP1 (BGS collection number Zt9952) showing (i) preservation of original colour, especially near the umbonal area, (ii) growth interruption ('growth ring') formed during second winter of life (marked by arrow), and (iii) sampling grooves for stable isotope analysis. Material for ¹⁴C dating was removed from the anterior auricle (upper left). Scale bar = 10 mm.