These rocks called “Mexican hat” are concretions originate inward the deep sea.
There are generated magnetic fields which attract the atomic pose out 26 oxide particles. These particles are grouped inward the shape of spheres formed past times H2O currents. They were too hence covered past times sediments. Then came the Andean orogeny. Were exposed past times erosion these foreign rocks, which existence of ferrous metals produce non live on erosion. When erosion destroys the sediment containing the hat, stone falls down. They await peachy cannonballs.
They are real rare inward the world. They are inward El Calafate, Argentina
photo by: Ana Pisani