The route always passes near the sea, through pine groves, rocky trails and cliffs. It is not difficult and in just over an hour and a half we have reached our goal that was Cala Escorxada -very lonely at this time of year- and found a paleontological site of what I had read, but I had never seen before.
Gastropod fossil on the rocks near Escorxada.
What is this I found on the beach? is it a mermaid's purse?
The enchantingly named structures are the egg cases of skates and some sharks. This is why they are also known as skate cases.
While some sharks bear live young, some sharks (and all skates) release their embryos in leathery egg cases that have horns and sometimes long tendrils at each corner.
The tendrils allow them to anchor to seaweeds or other substrates. Each egg case contains one embryo. The case is made up of a material that is a combination of collagen and keratin, so a dried egg case feels similar to a fingernail.