Early Jurassic (Lias γ, Pliensbachian) ferruginous limestone (the bed below the hammer) and marl (the bed ‘behind’ the hammer) in the cap rocks of the oolithic iron ore deposit at the village of Rottorf am Klei, Lower Saxony, Germany, largely obscured by weathered material of the same rocks.
<a href="//commons.wikimedia.org/wiki/User:Gretarsson" title="User:Gretarsson">Gretarsson</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>