Mud cracks - nothing's simple
by David Tanner, Leibniz Institute for Applied Geophysics (LIAG), Hannover, Germany
Positive imprint of dessication cracks in micritic mudstone from the Triassic Muschelkalk in Germany. The cracks are not similar polygons - most are rectangular and all different sizes. Width of sample - 9cm.
David Tanner (distributed via imaggeo.egu.eu)