Description: The Bear Gulch Limestone is a deposit of some 70 square km in extent and 30 m in depth that has been a source of one of the most diverse assemblages of fossil fish with some 110 species having been described over the past 30 years. Most were new to science, and provided a unique view of the marine environment of Mississippian times. Fine preservation of both fish and invertebrates is a hallmark of these deposits, presumably due to an anoxic depositional environment. This specimen is a fine example of an annelid worm. The annelids derive their name from the Latin word anellus, meaning little ring, a feature faintly seen here at both ends of the specimen. Numerous species of platyhelminth, nemertine, and annelid worms are known from the fauna.