Hello, I hope today finds you digging. I am a very curious cat, in our garden area, there is a wide variety of rock types. Some are beautiful river rock, we also have an abundance of seashells. Being the amature/hobbiest that I am, I am always trying to learn and look for reasons to be digging in particular areas. The area that I am in now is clay, loads and levels and layers of clay, uugghhhh. Now with that I believe I have found a couple of fossils, oncolites and a type of sponge. The pics are on here. I am wondering, in this crazy clay what do I need to look for? I find flint, quartz crystalization, obsidion, etc. Any ideas, maybe 15 feet? Thank you ahead of time. I want a trillobite lol!