picked these fossils up on a creekbed hunt in southeastern illinois. Im an avid indian artifact hunter and have become a fossil collecter too in the process. I was told this was just a concretion by a blogger on arrowheads.com, and i just wanted a second opinion since ive seen my fair sharre of concretions, and this dosent look anything like one. fossils are kinda rare in my region due to sediment and no real rocky outcrops. Even most creekbeds i hunt around here dont have many to offer. These were found real near the calhoun coal bed. If you havent ever heard of this dont feel bad neither had i untill i stumbled upon this creek littered with fossils. out of curiousity I filled a backpack with some items and took them home to study. Thats when i stumbled upon the google article about the calhoun coal bed. Google this and please get back with me on an answer on perhaps what these items sare thanks, Mitchell Clore P.S. believe this to be pennsylvanian era.