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  • [[File:P693033.jpg|thumbnail|Detail of the Concretionary Limestone Member of the Roker Formation from a coastal exposure near Sunderland [NZ 4 During the Dinantian and most of the Namurian, limestone and marine mudstone were deposited in maximum water depths of a few tens of
    24 KB (3,594 words) - 16:07, 5 May 2016
  • [[File:P693034.jpg|thumbnail|Collapse-brecciated limestone of the Roker Formation produced following dissolution of the underlying Har ...he clastic units are interbedded with thin beds of dolostone and dolomitic limestone. Thin layers of aeolian sand are present in many places, particularly near
    28 KB (4,268 words) - 13:30, 6 May 2016