Sometimes I am amazed at the things which amaze me. Take these cracks in the mud, for instance. I found them along the Rio Grande above Caballo Dam eight days ago. I spent fifteen minutes or so just staring at them. Some of the large cracks were vertical cuts of four to five inches. These cracks extended over a very large area.
I was, and am, at a loss to explain how vertical cracks at that depth can develop. To a knowlegeable person there is probably an obvious explanation. But I am not knowledgeable so I get to be unabashedly amazed. - RABarnes