The Geological Society of/(meric^ Inc. Microform Pubficati^n 3 Pennsylvanian Conodont Biost^tigraphy and Paieoecolbgy of NorthwesternHIIinbis cai ' Glen'K. Merrill V Department of Geology f College of Charleston Charleston, South Carolina &3&f *"-*:. ** Published by Jhe G^ologicaLSociety of America,,Inc. \ . 3300 Penrose Place * Boulder, Colorado 80301 1975 Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3743718/9780813759036_frontmatter.pdf by guest on 02 October 2021 CONTENTS Page Card/Row Acknowledgments v. j index Abstract. ...... .T. .............................. .^j^. ........... 1 1, A6" Introduction. ...................................... i ...... ,- , . 2 1 , A7 _ Purpose and Scope. ............................ J. ............. 2 1 , A7 Geologic Setting..... ........................ ./............... 2 "i, r A7 Paleoecology..... ..................... v.. ......... J. .............. 6 l^All ' General Environmental Analysis ...............;......... rv*C. '. 6 . 1 / :A1 1 ' Depth. ....................... ..:......... J. ........... .i* . 6 . 1, All Substrate.............................,...'. ........'....... 7 -*' 1, A12~ Conodont Abundance. ......................... v *. .......... 8 .lv, A13 Conodont Biof acies Analysis ................................*.. 8 1 , A13 Idtogruztfodiis-Biof acies . ................................. .^. 10 1, Bl Cavu8gnathu8 -Biof acies ....................................... 10 1 , Bl Streptognathodus-Eiof acies.. .................................. 10 1, Bl Aethotaxis-Xiof acies...... ................................... 11 lj B2 Idiopriontodus-'Biof acies ...................................... 1 1 1 > B2 Condole lla-*Bio fades-'. .................................. ".. 11 I , B2 -Biof acies ....................................... 13. 1 , B4 Environmental Significance of Black Shales ................... 13 1 , B4 Summary Model. ............................................... 17 1 , B8 Descriptions of Individual Stratigraphic Units. .....'............. 19 1, BIO Cramer Member. ............................................... 19 1, BIO Exline Member...... .......................................... 19 1, BIO Desmoinesian-Missourian Boundary .......................... 20 1, B12 Lonsdale Member ..:............... ^. .......................... 20 1 / B12 Sparland Member:... ........................................... 26 1, C4 .Pokeberry Member. ............................................ 27 1, C5 Brereton Limestone. .....,......'......,..........'............. 28 1 , C6 St. David Member......................,....'.................. 30 1, CJO Hanover Member. ............................................... 32 T, C12 Oak Grove Member. ............ ........ <y.,. .......... .. .\ ...... 33 1,*C13 Seahorne Member. ....... .............. .y.'. ............. ....... 35 1, Dl ' Seville Member...... ......................................... 37 1, D3 "Seville" Member Nea^r Andalusia, Rock Island County .......... 37 1 , D3 ' Bios tratigraphy. ................................................. 39 1, D0^ Zonation and Internal Bios tratigraphy ........................ 39 1 , d6 Interregional Correlations ................................... 41 1 , D8 Systematic Paleontology. ....,......,.............,.....'............ 44 1, Dll Genus Covusgnothus Harris and Hoi lings worth. ................. 44 1 , Dll Covusgnathus lautus Gunnell. ................................. 44 1, Dll Genus DiplognathoduM Kozur and Merrill in Kozur . ............. 46 1 , D13 Diplognathodits coloradbensis (My r ray and Chronic) ............48 1, El Diplcgnathodus Illinois ensie Merrill, n. sp. ............. ^. * 50 1, E3 Genus Gondolella Stauffer and Plummer. ....................... 51 1, E4 Gondolella gyrrma Merrill and King. ........................... 55 1, E8 ii Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3743718/9780813759036_frontmatter.pdf by guest on 02 October 2021 Gondolella pulchra n. sp. .................................... 57 1, E10 Gondolella bella Stauffer and ; Plummer........................'. 58 1, EH Gondolella.magna. Stauffer and Plummer.............'..,......... 61 1, E14 Genus Idiognathodus Gunnell................................... 61 1, EI4 _..._ - Idiognathodus claviformis Gunnell..........,...-...;.....,,...., 63 1, F2 «v Idiognathodus delicatus Gunnell. ...,.....'...................,. 63 1, F2 Genus, Neognathodus Dunn...........'................;.'.......... 64 - 1, F3 Neognathodus bassleri bassleri (Harris-and Hollingsworth)..... 67 1-,- F6 - ' Neognathodus bothrops Merrill....................^ ........... 69 I/F8 . \ Neognathodus medadultimus Merrill...... v ...................... 69 1, -F8 Neognathodus medexultimus Merrill................>..........., 69 1, F8 Intermediate Neognathodids......'.............................. 71 1, F10 Neognathbdus roundyi (Gunnell).............................. ^ 71 1, F10 t Neognathodus dilatus (Stauffer and Plummer)................... 71 * 1, F10 Neognathodus metanodosus n. sp.. T........ ....; ..,.«........... 71 1, F10 \ Neognathodus polynodosus n. sp. ... .^............ r ............ 72 1, Fl1 Neognathodus oligonodosus n. sp. ...^......................... -73. _ 1, F12 Neognathodus anodosus n. sp. .......??........................ 73 1, F12 Genus Streptognathodus Stauffer and Plummer................... 74 1, F13 Streptognathodus excelsus Staaffer and Plummer................ 75 1, F14 * Streptognathodus gracilis Stauffer and Plummer... J............. 76 1, Gl Streptognathodus elegantulus Stauffer and Plummer............. 76 1, Gl Streptognathodus caneellosus (Gunnell)........................ 77 1, G2 Streptognathodus oppletus Ellison..-........................... 77 1, G2 Multielement Taxonomy........................'................. 78 1, G3 Appendix 1. Distribution of Specimens............................. 97 2, Bl Appendix 2. Register or Collecting Localities.../....-.,........... 117" 2, Dl References. Cited.............. :v.................................. 124 2, El J * Reprint of article from Geology. .....................v............ 128 2, F2 t ILLUSTRATIONS >i^_ Note. Most illustrations are repeated in the next frame following every callout in the text. Figure 1. Locality Map............................................. 3 1, A8 Figure 2. Generalized Stratigraphic Column......,...;.......,..... 4 1, A9 Figure 3. The Flotant Model...;...........'......................... 15 1, 36 Figure 4. Summary Model of Depositional Environments.............. 18 1, B9 Figure 5. Lonsdale Depositional Environments..,.....^............. 22 1, B14 Figure 6. Lonsdale Columnar Sections .................y ............ 25 1, C3 Figure 7. Summary of'Hanover Depositional Environments............ 34 1, C14 Figure 8. Summary of Oak Grove. Sediment Distribution.............. 36 1, D2 Figure 9. Cavusgnathus , Range and Phylogeny....................... 45 1, D12 Figure 10. Diplognathodua Morphologyv^«$4........................... 47 1, D14 Figure 11. Diplognothodus , Range and Phy logeny..................... 49 1, E2 Figure 12. Gondolella, Range and Phylogeny..................../... 53 1, E6 Figure 13. Neognathodus , Range and Phylogeny................../... 68 1, F7 . Conodont Figures (photographic prints are also included) N* Figure 14. McLeansboro (Modesto) Conodonts........................ 90 ,2, A2 Figure 15. Kewanee (Upper Carbondale) Conodonts................... 92 2, A4 Figure 16. Kewanee (Middle Carbondale) Conodonts.................. 94 2, A6 » ' ill Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3743718/9780813759036_frontmatter.pdf by guest on 02 October 2021 Figure 17. Kewanee (Spoon and Lower Carbondale) Conodonts........'........ 95 2, A8 Table 1. Transgressive/Regressive Mechanisms in Perideltaic Environments. 9 I, A14 Table 2.'Distribution of All Conodonts from This Study................... 9 1, A14D7' *" Table 3. Conodont Zonation .of Northeastern Illinois...................... 40 1, Table 4. Internal_CJironostratigraphic Correlations, Northwestern Illinois 1 42 D9 Table 5. Interregional Correlations and Comparison Between Neognathodid and Fusulinid Zonation.......................................... 42 li D9 Table 6. Distribution of Gondole'lla in Northwestern Illinois............. 52 1, E5 TabT.e 7. Features of Middle and Late Desmoinesian Gondolellids........... 60 1, E13 Table 8. Ratio of Neognathodids to Other Platforms..............'......... 66 1, F5 Table 9. Distribution of Species of Neognathodus by Stratigraphic Unit in Northwestern Illinois.................................... 70 1, F9 Table 10. Taxonomic Libretto.............................................. 81 G6 -1 iv Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3743718/9780813759036_frontmatter.pdf by guest on 02 October 2021 ACKNOWLEDGMENTS 'During the six years this work was in preparation a great many persons assisted in a variety of ways. Field and laboratory facilities for the bulk of the, work were provided by .'the Geology Department at Monmouth College, Mofamoj|th, Illinois. Two Students from that department, Miss Susan M. Bahnick and^lr. Michael J. Hochsteih, devoted many hours in the field, in the processing laboratory, and at the microscope during the early stages of this study. Their contribution cannot be overemphasized. The personnel of the Illinois State Geological Survey, particularly the Coal Section, and especially Dr. M', E. Hopkins and Mr. William H. Smith, kindly provided a wealth