According to their origin, some types of cleats are distinguished:
- Of retraction. Fractures formed in rocks when they lose volume. For example, clays when dehydrating or basalt when solidifying.
- Of tension. For example, when the bends due to the tension existing in the external part of the hinge, joints are produced.
- By compression. On the inside of the flap of the pleats.
De PePeEfe - Trabajo propio, GFDL, https://commons.wikimedia.org/w/index.php?curid=6271493