The reddish sediments in the background contain remainings from the miocene period. These layers were "cooked", i.e. they were covered with glow-hot lava during vulcanic eruptions. If one is lucky and works very hard (hanging on a rope), it is possible to find fossilized eggs of ostrich like birds. The reddish woman in the front is our "good soul" Sybilla ;-)
If you are satisfied with single egg shells, you can just search the ground. But you need a good eye to find something. Where do the shells hide?