The regional zonation of the Wenlock–Ludlow boundary is established for the Prague Synform using refined data from updated conodont records. The following conodont zones have been recognized in the Prague Synform: the Ozarkodina sagitta sagitta Zone, the Ozarkodina bohemica Interval Zone, the Kockelella crassa Zone, the Kockelella variabilis variabilis Interval Zone and the Ancoradella ploeckensis Zone. The Ozarkodina bohemica longa and Kockelella ortus absidata zones are used herein at subzonal level only because the entries of index taxa cannot be precisely detected. The Bohemian conodont zonal scale is correlated with the recently proposed standardized zonation. The established conodont zones are tentatively correlated with global graptolite zonation and matched against generalized eustatic and carbon isotope curves.
Aldridge, R. J. & Schönlaub, H. P. 1989. Conodonts. In A Global Standard for the Silurian System (Holland, C. H. & Bassett, M. G., eds), National Museum of Wales Geological Series, 9, 274–279.
Barrick, J. E. & Klapper, G. 1976. Multielement Silurian (late Llandoverian–Wenlockian) conodonts of the Clarita Formation, Arbuckle Mountains, Oklahoma, and phylogeny of Kockelella. Geologica et Palaeontologica, 10, 59–100.
Barrick, J. E., Kleffner, M. A. & Karlsson, H. R. 2009. Conodont faunas and stable isotopes across the Mulde Event (late Wenlock; Silurian) in southwestern Laurentia (south-central Oklahoma and subsurface West Texas). Paleontographica Americana, 62, 41–56.
Branson, E. B. & Mehl, M. G. 1933. Conodont studies. University of Missouri Studies, 8(1–4), 1–343.
Calner, M. & Jeppsson, L. 2003. Carbonate platform evolution and conodont stratigraphy during the middle Silurian Mulde event, Gotland, Sweden. Geological Magazine, 140, 173–203.
http://dx.doi.org/10.1017/S0016756802007070
Chlupáč, I., Kříž, J. & Schönlaub, H. P. 1980. Field Trip E. Silurian and Devonian conodonts of the Barrandian. In Second European Conodont Symposium ECOS II. Guidebook – Abstracts (Schönlaub, H. P., ed.), Abhandlungen der Geologischen Bundesanstalt, 35, 147–180.
Corradini, C. & Serpagli, E. 1999. A Silurian biozonation from late Llandovery to end Přidoli in Sardinia (Italy). In Studies on Conodonts. Seventh European Conodont Symposium Bologna–Modena 23–25 June, 1998 (Serpagli, E. & Corradini, C., eds), Bolletino della Società Paleontologica Italiana, 37, 255–273.
Corradini, C., Corriga, M. G., Männik, P. & Schönlaub, H.-P. 2014. Revised conodont stratigraphy of the Cellon section (Silurian, Carnic Alps). Lethaia, 16 pp.
http://dx.doi.org/10.1111/let.12087
Corriga, M. G., Corradini, C. & Ferretti, A. 2009. Silurian conodonts from Sardinia: an overview. In The Silurian of Sardinia (Corradini, C., Ferretti, A. & Štorch, P., eds), Rendiconti della Società Paleontologica Italiana, 3, 95–107.
Cramer, B. D., Kleffner, M. A. & Saltzman, M. R. 2006. The late Wenlock Mulde positive carbon isotope (δ13Ccarb) excursion in North America. GFF, 128, 85–90.
http://dx.doi.org/10.1080/11035890601282085
Cramer, B. D., Brett, C. E., Melchin, M. J., Männik, P., Kleffner, M. A., McLaughlin, P. I., Loydell, D. K., Munnecke, A., Jeppsson, L., Corradini, C., Brunton, F. R. & Saltzman, M. R. 2011. Revised correlation of Silurian Provincial Series of North America with global and regional chronostratigraphic units and δ13Ccarb chemostratigraphy. Lethaia, 44, 185–202.
http://dx.doi.org/10.1111/j.1502-3931.2010.00234.x
Cramer, B. D., Condon, D. J., Söderlund, U., Marshall, C., Worton, G. J., Thomas, A. T., Calner, M., Ray, D. C., Perrier, V., Boomer, I., Patchett, P. J. & Jeppsson, L. 2012. U–Pb (zircon) age constraints on the timing and duration of Wenlock (Silurian) paleocommunity collapse and recovery during the “Big Crisis”. Geological Society of America Bulletin, 124, 1841–1857.
http://dx.doi.org/10.1130/B30642.1
Frýda, J. & Frýdová, B. 2014. First evidence for the Homerian (late Wenlock, Silurian) positive carbon isotope excursion from peri-Gondwana: new data from the Barrandian (Perunica). Bulletin of Geosciences, 89, 617–634.
http://dx.doi.org/10.3140/bull.geosci.1493
Jeppsson, L. 1997. A new latest Telychian, Sheinwoodian and Early Homerian (Early Silurian) standard conodont zonation. Transactions of the Royal Society of Edinburgh: Earth Sciences, 88, 91–114.
http://dx.doi.org/10.1017/S0263593300006854
Jeppsson, L. & Calner, M. 2003. The Silurian Mulde Event and a scenario for secundo-secundo events. Transactions of the Royal Society of Edinburgh, Earth Sciences, 93, 135–154.
Jeppsson, L., Eriksson, M. E. & Calner, M. 2006. A latest Llandovery to latest Ludlow high-resolution biostratigraphy based on the Silurian of Gotland – a summary. GFF, 128, 109–114.
http://dx.doi.org/10.1080/11035890601282109
Kříž, J. 1991. The Silurian of the Prague Basin (Bohemia) – tectonic, eustatic and volcanic controls on facies and faunal development. Special Papers in Palaeontology, 44, 179–203.
Kříž, J. 1992. Silurian field excursions: Prague Basin (Barrandian), Bohemia. National Museum Wales, Geological Series, 13, 1–111.
Kříž, J., Jaeger, H., Paris, F. & Schönlaub, H. P. 1986. Přídolí – the fourth subdivision of the Silurian. Jahrbuch der Geologischen Bundesanstalt, 129, 291–360.
Kříž, J., Dufka, P., Jaeger, H. & Schönlaub, H. P. 1993. The Wenlock/Ludlow boundary in the Prague Basin (Bohemia). Jahrbuch der Geologischen Bundesanstalt, 136, 809–839.
Manda, Š., Štorch, P., Slavík, L., Frýda, J., Kříž, J. & Tasáryová, Z. 2012. The graptolite, conodont and sedimentary record through the late Ludlow Kozlowskii Event (Silurian) in the shale-dominated succession of Bohemia. Geological Magazine, 149, 507–531.
http://dx.doi.org/10.1017/S0016756811000847
Märss, T. & Männik, P. 2013. Revision of Silurian vertebrate biozones and their correlation with the conodont succession. Estonian Journal of Earth Sciences, 62, 181–204.
http://dx.doi.org/10.3176/earth.2013.15
Melchin, M. J., Sadler, P. M. & Cramer, B. D. 2012. The Silurian Period. In The Geologic Time Scale 2012, Vol. 2 (Gradstein, F. M., Ogg, J. G., Schmitz, M. D & Ogg, G. M., eds), pp. 525–558. Elsevier.
Serpagli, E. 1971. Uppermost Wenlockian–Upper Ludlowian (Silurian) conodonts from Western Sardinia. Bolletino della Società Paleontologica Italiana, 9, 76–96.
Slavík, L. & Carls, P. 2012. Post-Lau Event (late Ludfordian, Silurian) recovery of conodont faunas of Bohemia. Bulletin of Geosciences, 87, 815–832.
http://dx.doi.org/10.3140/bull.geosci.1368
Štorch, P., Manda, Š. & Loydell, D. K. 2014. The Early Ludfordian leintwardinensis graptolite Event and the Gorstian–Ludfordian boundary in Bohemia (Silurian, Czech Republic). Palaeontology, 57, 1003–1043.
http://dx.doi.org/10.1111/pala.12099
Viira, V. 1999. Late Silurian conodont biostratigraphy in the northern East Baltic. In Studies on Conodonts. Seventh European Conodont Symposium Bologna–Modena 23–25 June, 1998 (Serpagli, E. & Corradini, C., eds), Bolletino della Società Paleontologica Italiana, 37, 299–310.
Viira, V. & Aldridge, R. J. 1998. Upper Wenlock to lower Přidoli (Silurian) conodont biostratigraphy of Saaremaa, Estonia, and a correlation with Britain. Journal of Micropalaeontology, 17, 33–50.
http://dx.doi.org/10.1144/jm.17.1.33
