&amp;quot;Turritella Agate&amp;quot; (partially chertified fossiliferous lacustrine limestone) (Laney Member, Green River Formation, Middle Eocene; North Barrel Springs Draw, south of Wamsutter, Wyoming, USA) 1 (James St. John) Tags: road lake green agate river fossil snail formation limestone member wyoming rim snails delaney laney fossils gastropod eocene fossiliferous chert gastropods tenera turritella lacustrine wamsutter elimia chertified