The bed of the mighty LaBarque Creek is a motherlode of fossils and a rockhound's Eden. The rocks are a perfect Chex Mix of limestone, sandstone, shale, chert (sometimes resembles arrowheads!), dolomite, hunks of iron, hardened clay, and marble. I find that the rocks with fossils are almost always turned fossil side up. Most fossils here are those of ancient marine plants, both simple and leafy, and simple animals, sort of like coral, called crinoids. My guess is that what you see in the close-up photo is crinoids. I don't know how or why I sleep when there is such cool stuff not 200 feet from my door.