Kern in Wommersom kwartsiet, gevonden door Jan Tweepenninckx in Hakendover, 1970
<a href="//commons.wikimedia.org/wiki/User:Vaneiles" title="User:Vaneiles">Vaneiles</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>