The 29 illustrated localities depicted in this very colourful broadsheet (folded to a third of A4) constitute a 4 km circular tour around Holyrood Park and describe the geology of the 340 million-year-old (Early Carboniferous) volcano of Arthur’s Seat, together with its earlier sedimentary foundation and the later intrusive sill of Salisbury Crags. Glacial features are also discussed and the text is complemented by 1:10,000 maps of the geology and topography, and by a geological panorama of the park. One of several side panels is devoted to James Hutton and his hugely influential 1785 book, The Theory of the Earth.