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  • [[File:P693034.jpg|thumbnail|Collapse-brecciated limestone of the Roker Formation produced following dissolution of the underlying Hartlepool Anhydrite. Trow Deposition of the Roker Formation on the shelf and adjacent basin slope marks the onset of the next major mar
    28 KB (4,268 words) - 12:30, 6 May 2016
  • ...:P693033.jpg|thumbnail|Detail of the Concretionary Limestone Member of the Roker Formation from a coastal exposure near Sunderland [NZ 412 555]. (P693033).]]
    24 KB (3,594 words) - 15:07, 5 May 2016