Natural History – Antique Knightia Fish Fossil in Stone Matrix Consign Now DeptCollections, Decorative Arts, Fine Arts, Maritime ArtsSize8.25 in. x 10.75 in. Natural History-Antique Knightia Fish Fossil in Stone Matrix, Green River formation. 8.25 in. x 10.75 in. Please note that this auction has ended. Click here for an overview of this auction.