Green reduced zones within slightly more permeable red mudrock highlights the presence of infilled dessication cracks in the Ragged Reef Formation <a href="https://en.wikipedia.org/wiki/Pennsylvanian" class="extiw" title="w:Pennsylvanian"> Pennsylvanian</a>, Cumberland Basin, Nova Scotia.
<a href="//commons.wikimedia.org/wiki/User:Rygel,_M.C." title="User:Rygel, M.C.">Rygel, M.C.</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>