The Ordovician Exposed: Short Papers, Abstracts, and Field Guides for the 12th International Symposium on the Ordovician System June 3-17, 2015 at James Madison University Harrisonburg, Virginia USA Central Appalachian Mountains The Ordovician Exposed: Short Papers, Abstracts, And Field Guides for the 12th International Symposium on the Ordovician System June 3-17, 2015 at James Madison University Harrisonburg, Virginia USA Central Appalachian Mountains Edited by Stephen A. Leslie, Daniel Goldman, and Randall C. Orndorff Cover Photo: Sandbian carbonate succession of the uppermost Big Valley, McGlone, McGraw and lowermost Nealmont formations exposed in the North Fork Quarry near Riverton, West Virginia Germany Valley. Field stop of the conference field trip. Photo by John Haynes The Sedimentary Record, 13 (2) App. A The Ordovician Exposed: Short Papers, Abstracts, and Field Guides for the 12th International Symposium on the Ordovician System June 3-17, 2015 James Madison University Harrisonburg, Virginia USA Central Appalachian Mountains Organizing Committee: Stephen A. Leslie, James Madison University (Chair) Daniel Goldman, University of Dayton (Co-Chair) Randall C. Orndorff, United States Geological Survey (Co-Chair) John T. Haynes, James Madison University Matthew R. Saltzman, The Ohio State University John F. Taylor, Indiana University Pennsylvania Achim Herrmann, Louisiana State University Charles E. Mitchell, University of Buffalo John E. Repetski, United States Geological Survey Stig M. Bergström, The Ohio State University Jesse Carlucci, Midwestern State University Stephen R. Westrop, University of Oklahoma Carlton Brett, University of Cincinnati Suggested Reference Format: [Authors], 2015. [Abstract title]. The Sedimentary Record, 13, (2), Appendix A: [page no.], S.A. Leslie, D. Goldman, and R.C. Ordorff, eds., 12th International Symposium on the Ordovician System, Short papers and abstracts (online only) DOI: http://dx.doi.org/10.2110/sepmord.015 The Sedimentary Record, 13 (2) App. A Preface For nearly two centuries some of the world’s most notable geologists and paleontologists have intensively studied the Ordovician rocks of North America. The “layer cake” sedimentary strata deposited in the vast epicontinental seas of the interior and the flanking folded and thrusted mountain belts provided both complex problems and fertile ground for new theories and methods. The problem of correlating between regions in the large cratonic interior and between disparate biofacies gave rise to exciting new studies in sequence, event, quantitative, and chemo- stratigraphy. Distinctive and traceable marker beds, geochemically fingerprinted K-bentonites, and carbon isotope excursions allow for correlation with unprecedented precision, which led to new questions (and answers) about Ordovician climate and oceanography, global carbon cycling, and the timing of tectonic events. Recent innovations in using geochemistry to study the ancient environment has greatly increased our understanding of Ordovician climate cyclicity and its effects on Earth’s biota. Advances in geochronology have given the geologic community amazingly precise dates on Ordovician K-bentonites, increasing the precision and usefulness of our most fundamental tool – the geologic time scale. It is an exciting time in Ordovician research and the highlights of this work are presented here at the 12th International Symposium on the Ordovician System. The conference includes fifty- nine talks and 18 posters presentations given by over 80 delegates representing 14 different countries. Its overall theme is Integrated Stratigraphy, and as noted above comprises the latest research in sedimentary geochemistry, geochronology, sequence stratigraphy, event stratigraphy, and quantitative stratigraphic methods. These studies provide the stratigraphic framework and paleoenvironmental context for examining the evolution, diversification, and extinction of Ordovician life. ISOS 2015 offers 4 field trips - 3 to the southern, central, and northern Appalachian Mountains, and one to eastern and central Oklahoma - to examine classic exposures of Ordovician rocks and the only Ordovician GSSP in the United States. Finally, we would like to thank the presenters, field trip leaders, and manuscript reviewers, all of whom are essential to a successful symposium. On behalf of the entire Organizing Committee, Stephen A. Leslie, Daniel Goldman, and Randall C. Ordorff The Sedimentary Record, 13 (2) App. A Table of Contents Conference Program .......................................................................................................................... 9 Short Papers The Cambrian-Ordovician boundary in the Cordillera Oriental, NW Argentina Guillermo L. Albanesi, M. Eugenia Giuliano, Fernanda E. Pacheco, Gladys Ortega and C. Rubén Monaldi ............................................................................................................................................... 19 Ordovician of the Anarak Region: implications in understanding Early Palaeozoic history of Central Iran Vachik Hairapetian, Mansoureh Ghobadi Pour, Leonid E. Popov, S. Hassan Hejazi, Lars E. Holmer, David Evans and Ali Sharafi ............................................................................................... 22 The balognathiid apparatuses of Eoplacognathus robustus Bergström and E. lindstroemi Hamar Susana Heredia and Ana Mestre ........................................................................................................ 30 The presence of the Lower-Middle Ordovician genus Baltoniodus in the central Andean Basin, Argentina: the stratigraphic significance Susana Heredia, Josefina Carlorosi, and Graciela Sarmiento .......................................................... 33 The Pygodus serra Zone in Cuyania, Argentina Susana Heredia, Ana Mestre, Tatiana Soria, and Cintia Kaufmann .................................................. 36 Biostratigraphy of the Cambrian–Ordovician boundary beds and the position of the lower Ordovician boundary at Kopet-Dagh, Iran Hadi Jahangir, Mansoureh Ghobadi Pour, Lars E. Holmer, Leonid E. Popov, Ali-Reza Ashuri, Adrian Rushton, Tatiana Yu. Tolmacheva and Arash Amini .............................................................. 39 A long-overdue systematic revision of Ordovician graptolite faunas from New South Wales, Australia Ian Percival, Petr Kraft, Zhang Yuandong, Lawrence Sherwin, and Bernd-D. Erdtmann ............... 47 Early Ordovician (Tremadocian) faunas and biostratigraphy of the Gerd-Kuh section, eastern Alborz, Iran Mansoureh Ghobadi Pour, Leonid E. Popov, Lars E. Holmer, Mahmud Hosseini-Nezhad, Rahimeh Rasulic, Khadijeh Fallah, Arash Amini and Hadi Jahangir ................................................ 54 Ordovician temperature trends: constraints from δ18O analysis of conodonts from New South Wales, Australia Page Quinton, Ian G. Percival, Yong-Yi Zhen, and Kenneth G. MacLeod ........................................ 61 1 The Sedimentary Record, 13 (2) App. A Early-middle Darriwilian graptolite and conodont faunas from the central Precordillera of San Juan Province, Argentina Fernanda Serra, Nicolás A. Feltes, Gladys Ortega and Guillermo L. Albanesi ................................ 67 Life on the edge in eastern Alaska: basal Ordovician (Tremadocian), platform-margin faunas of the Jones Ridge Formation John F. Taylor, Tyler J. Allen, John E. Repetski, Justin V. Strauss, and Savannah J. Irwin .............. 70 New conodont records from the Rinconada Formation, eastern margin of the Argentine Precordillera: tectono-stratigraphic implications Gustavo G. Voldman, Guillermo L. Albanesi, Juan L. Alonso, Luis P. Fernández, Aldo L. Banchig, Raúl Cardó, Gladys Ortega and Alberto M. Vallaure ......................................................... 77 Biostratigraphy and paleoecology of Late Ordovician (Ka2) conodonts and microbrachiopods from north Queensland, Australia Yong Yi Zhen and Ian Percival .......................................................................................................... 82 Abstracts Deciphering the movement of the Argentine Precordillera from tropical to higher latitudes, Late Cambrian–Late Ordovician, through conodont δ18O paleothermometry Guillermo L. Albanesi, Christopher R. Barnes, Julie A. Trotter, Ian S. Williams, and Stig M. Bergström ............................................................................................................................................ 89 A CONOP9 quantitative stratigraphic model of Baltic Ordovician and Silurian chitinozoan distribution and K-bentonites Liina Antonovitš, Viiu Nestor, Jaak Nõlvak, Garmen Bauert, Olle Hints, and Tarmo Kiipli ............ 90 Recurring Taphofacies in the Upper Ordovician (Katian) of the Cincinnati Arch: A Predictive Model Based on Sequence Stratigraphy Christopher Aucoin, Carlton E Brett, James R Thomka, Benjamin F Dattilo ................................... 91 Correlation of Upper Ordovician K-bentonites in the East Baltic – a combined approach of chitinozoan biostratigraphy and sanidine geochemistry Heikki Bauert, Garmen Bauert, Jaak Nõlvak, and Tarmo Kiipli ........................................................ 91 Lithologies, ages, and provenance of clasts in the Ordovician Fincastle Conglomerate, Botetourt County, Virginia, USA Harvey Belkin, John E. Repetski and Randall C. Orndorff ............................................................... 92 2 The Sedimentary Record, 13 (2) App. A An integrated scheme for δ13C chemostratigraphy