Black Sediments at Rhossili 1 – Microphotograph of the composition of black beach sediments sampled from the shore at Rhossili, Gower, South Wales, viewed under the microscope (with a maximum magnification of x300) showing what appears to be waterlogged fragments of wood, small pieces of coal, seeds, and numerous delicate white elongated organic objects that look like fish bones or maybe even heart urchin spines.
Jessica's Nature Blog 