Note 31 — Chapter V
Reading edition
Such is the aspect of the organisms in some of the Silurian sandstones near Girvan. I have seen the same bright tint on a set of fossils from the Llandeilo flags of Wales, and from the slates of Desertcreat, Ireland, and have disinterred similarly gilded shells from the vertical greywackè slates of the Pentland Hills and Peeblesshire. Nothing can be more beautiful than the aspect of these fossils when first laid open, but the bright gleam eventually passes away on exposure.