Geoturism Balearic Islands

Continuing along the track that follows the coast, at point A we see a final tectonic, eustatic or antropical processes</span></p></div>">outcrop of materials of the Upper Jurassic, so recurrent in the zone. In them there is occasional presence of ammonites.

At this point the track is enclosed in a short levelled section. To the right there is an slope with smooth, slightly inclined walls, which corresponds to a fault plane (a surface in favour of which the rock was fractured and displaced). The friction of the movement has polished the surface and left a fine, characteristic parallel striation that shows us the direction in which the fault acted.

Following the track we can observe a change in the materials: the debris of Quaternary reappears.

Leaving these behind, at point B we find a small hollow in the left-hand slope, formed by rocks of a yellowish colour.  

Looking closely we can see that they contain a countless number of lens-shaped fossils, most of them seen in cross-section. These are nummulites, a type of single-cell organism equipped with a calcareous shell with a complicated internal structure in the form of a segmented spiral. These fossils are some 45 Ma old and correspond to the oldest Cenozoic materials of the Balearic Islands, from the Eocene.

This type of rocks can be observed as far as the military barracks, so it is advised to examine the rocks of the ground to see good examples of nummulites.