Teeth
Mississippian rock layers in the central U.S. contain ancient shark remains (roughly 355 to 350 million years old). Sometimes they are found in bone beds, layers rich in phosphatic remains. Other occurrences are random. This list is based on paleontological work done in the past 150 years. I’ve tried to be accurate with the spelling of the species, but typos may occur with the unusual spelling of their names.
These fossils were described across Illinois, Indiana, Iowa, Kentucky, and Missouri.
St. Louis Limestone (Youngest formation in this list)
Warsaw = Harrodsburg and Salem Limestones (including the Somerset Shale in Kentucky)
Keokuk = Muldraugh Formation in Kentucky, Ramp Creek in Indiana
Burlington (The oldest formation) = Borden Formation (New Providence Shale) in Indiana and Kentucky is this age.
Name Age
Antliodus cucullus Keokuk
Antliodus gracilis Warsaw
Antliodus minutus Keokuk
Antliodus parvalus Burlington
Antliodus perovalis Warsaw
Antliodus sarcululis Burlington
Antliodus similus Keokuk
Antliodus simplex Burlington
Antliodus sulcatus Keokuk
Carcharopsis wortheni Subcarboniferous
Chitonodus antiquus Lower Burlington
Chitonodus latus Keokuk
Chitonodus rugosus Burlington
Chitonodus springeri Upper Burlington
Chitonodus tribulis Keokuk
Chromatodus affinis Keokuk
Chromatodus comptus Burlington
Chromatodus costatus Keokuk
Chromatodus elegans Keokuk
Chromatodus linearis Subcarboniferous
Chromatodus loriformis Keokuk
Chromatodus molaris Keokuk
Chromatodus parallelus Warsaw
Chromatodus varsoviensis Warsaw
Cladodus acuminatus Subcarboniferous
Cladodus angulatus Keokuk
Cladodus bellifer Burlington
Cladodus deflexus Burlington
Cladodus gomphoides Burlington
Cladodus intercostus Burlington
Cladodus lamnoides Keokuk
Cladodus micropus Keokuk
Cladodus praenuntius Burlington
Cladodus mraricoststus Keokuk
Cladodus robustus Keokuk
Cladodus turritus Keokuk
Cochliodus costatus Burlington
Ctenopetalus vinosus Keokuk
Deltodopsis affinis Warsaw
Deltodopsis bialveata Burlington
Deltodopsis convexa Upper Burlington
Deltodopsis exornata Warsaw
Deltodopsis inflexa Keokuk
Deltodopsis keokuk Keokuk
Deltodus cinctus Warsaw
Deltodus latior Keokuk
Deltodus littoni Subcarboniferous
Deltodus occidentalis Warsaw & St. Louis
Deltodus spatulatus Burlington
Deltodus stellatus Keokuk
Deltodus trilobus Warsaw
Deltodus undulatus Keokuk
Desmiodus flabellum Keokuk
Desmiodus ligoniformis Keokuk
Desmiodus minasunlus Keokuk
Helodus angulatus Burlington
Helodus compressus Burlington
Helodus coniculus Burlington
Helodus crenulatus Keokuk
Helodus denshumani Keokuk
Helodus denticulatus Keokuk
Helodus elytra Keokuk
Helodus gibbosus Keokuk
Heliodus gibbus Keokuk
Helodus limax Burlington
Helodus politus Keokuk
Helodus sulcatus Keokuk
Helodus undulatus Keokuk
Hybocladodus compressus Burlington
Hybocladodus plicatus Burlington
Hybocladodus tenurcostatus Keokuk
Lambdodus calceolus Burlington
Lambdodus calceolus variety robustus Keokuk
Lambdodus costatus Burlington
Liodus calcaratus Burlington
Liodus calcaratus var. grossipunctatus Burlington
Lisgodus curtus Burlington
Lisgodus serratus Burlington
Mesodmodus ornatus Burlington
Orodus carinatus Keokuk
Orodus elegantulus Burlington
Orodus fastiatus Burlington
Orodus major Burlington
Orodus mammillaris Keokuk
Orodus minutus Keokuk
Orodus ornatus Keokuk
Orodus tuberculatus Burlington
Orodus variocostatus Burlington
Palaeobatis insignis tooth or spine? Keokuk
Periplectrodus warreni Burlington
Petalodus curtus Keokuk
Petalorhynchus striatum Burlington
Petrodus pustulosus Burlington
Physonemus gigas Burlington
Physonemus parvulus Keokuk
Poecilodus springeri Subcarboniferous
Poecilodus varsoviensis Warsaw
Polyrhizodus nanus Keokuk
Polyrhizodus plasensis Warsaw
Polyrhizodus porosus Burlington
Polyrhizodus truncatus Burlington
Polyrhizodus williamsi Keokuk
Psammodus glyptus Upper Burlington
Psammodus grandis Keokuk
Psammodus lovianus Burlington
Psammodus springeri Upper Burlington
Psammodus tumidus Upper Burlington
Psammodus turgidis Keokuk
Sandalodus angustus Keokuk
Sandalodus complanatus Upper Burlington
Sandalodus laevissimus Keokuk
Sandalodus minor Keokuk
Stemmatodus bicrustatus Burlington
Stemmatodus bifurcatus Burlington
Stemmatodus chiriformis Burlington
Stemmatodus keokuk Keokuk
Stemmatodus simplex Burlington
Stemmatodus symmetricus Burlington
Stenopterodus elongatus Warsaw
Stenopterodus planni Burlington
Taeniodus fasciatus Keokuk
Taeniodus regularis Warsaw
Tanadodus gracillimus Keokuk
Tanadodus multiplicatus Burlington
Tanadodus obscurus Keokuk
Thrinoacodus duplicatus Keokuk
Thrinoacodus incurvus Keokuk
Tomodus limitaris Upper Burlington
Vaticinodus discrepans Upper Burlington
Venustodus robustus Keokuk
Venustodus tenuicostatus Keokuk
Venustodus variabilis Burlington
Xystrodus inconitus Keokuk
Xystrodus simplex Upper Burlington
Shark Jaws
Deltoptychius primus Upper Burlington
Deltoptychius varsoviensis Warsaw
Deltoptychius wachsmuthi Keokuk
Rhizodus hardingi Subcarboniferous
Scales
Acrolepis hortonensis Keokuk
Spines
Acondylacanthus aequicostatus Keokuk
Acondylacanthus xiphias Keokuk
Anaclitacanthus semicostatus Burlington
Asteroptychius keokuk Keokuk
Asteroptychius triangularis Burlington
Batacanthus baculiformis Keokuk
Batacanthus necis Keokuk
Batacanthus stellatus Keokuk
Ctenacanthus burlingtonensis Burlington
Ctenacanthus coxanus Keokuk
Ctenacanthus excavatus Keokuk
Ctenacanthus gradocostatus Burlington
Ctenacanthus keokuk Keokuk
Ctenacanthus mayi Burlington
Drepanacanthus gemmatus Keokuk
Gampsacanthus latus Keokuk
Glymmatacanthus rudis Keokuk
Gyracanthus cordatus Keokuk
Oracanthus ?obliquus Keokuk
Pnigeacanthus deltoides Keokuk