Sinkholes

Notice the two small depressions in the middle of the field to your right. These circular depressions, which are usually larger than they are deep, are sinkholes. They expose the karstic soil below due to a dissolution of the rock underneath. They are created by fractures in the limestone, which become larger due to dissolution and drainage. They are often found in places where limestone has fallen victim to significant cracking, along fault lines and anticline summits, as is the case here.