<i>Placunopsis ostrcina</i>-riff/reef, Haßmersheimer Schichten, Oberer Muschelkalk, near Grünsfeld, Germany
<a href="//commons.wikimedia.org/wiki/User:BerndH" title="User:BerndH">Bernd Haynold</a>
CC BY 2.5
<span class="int-own-work">Self-photographed</span>