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Last week, after checking the weather wunderground numerous times, I decided to drive 3.5 hours from Chicago to St. Paul Stone Quarry. It was the last "open house" day according to the ESCONI website. I arrived at 7:45, the first and only person there. Shortly thereafter, after a brief safety instruction, I followed the manager to the collecting site, heaps and heaps of Waldron shale. Even though I dressed in layers, I still had to take breaks and warm up in the car for a few minutes, but I much rather prefer collecting in cold weather as opposed to hot summer sun with mosquitoes, any day. It didn't take too long to start finding fossils. Here are just a few of my finds: Eospirifer Platystrophia brachiopods with pyrite Platyceras niagarense encrusted with strophomenid, bryozoa and pyrite. front: back: Partial Dalmanitid Trilobite in matrix When prepping, it's really wonderful how the waldron "butter" shale just crumbles apart around the predictable morphology of an enrolled trilobite. The trip just wouldn't seem complete without a short drive east to the Cincinnati Arch roadcuts. I first went to South Gate and found a flexicalymene eroding right out of the cut. It is interesting to see the comparisons here. The trilobite on the left is from St Paul (Silurian) and has beautiful pyritized eyes. The one on the right is from South Gate (Ordovician). Both trilobites have 21 articulated segments; does this make them both the same age as "adults"? Interesting to note the difference in size, being 40 million years apart, same species.. Thanks for looking!
Oxytropidoceras posted a topic in Fossil LiteratureBauert, H., O. Hints, T. Meidla, and P. Männik, 2014, Abstracts & Field Guide 4th Annual Meeting of IGCP 591: The Early to Middle Paleozoic Revolution Estonia, 10-19 June 2014. Institute of Ecology and Earth Sciences, University of Tartu, Institute of Geology at Tallinn University of Technology and Geological Survey of Estonia. http://igcp591.org/2014/IGCP591-2014_book.pdf http://igcp591.org/books.php Brett, C. E., B. D. Cramer, T. L. Gerke (eds.) 2012a Middle Paleozoic Sequence Stratigraphy and Paleontology of the Cincinnati Arch: Part 1 Central Kentucky: International Geoscience Programme (IGCP) Project 591 2nd Annual Meeting and 1st Foerste Symposium Cincinnati, Ohio, USA 26th-28th, July, 2012 http://igcp591.org/downloads/Cincinnati2012_FieldGuide1.pdf http://igcp591.org/books.php Brett, C. E., B. D. Cramer, and T. L. Gerke (eds.) 2012b Middle Paleozoic Sequence Stratigraphy and Paleontology of the Cincinnati Arch: Part 2 Northern Kentucky And Southeast Indiana: International Geoscience Programme (IGCP) Project 591 2nd Annual Meeting and 1st Foerste Symposium Cincinnati, Ohio, USA 26th-28th July, 2012 http://igcp591.org/downloads/Cincinnati2012_FieldGuide2.pdf http://opus.ipfw.edu/geosci_facpubs/65/ http://opus.ipfw.edu/cgi/viewcontent.cgi?article=1064&context=geosci_facpubs https://works.bepress.com/ben_dattilo/21/ http://igcp591.org/books.php Calner, M., P. Ahlberg, O. Lehnert, and M. Erlström (eds.) The Lower Palaeozoic of southern Sweden and the Oslo Region, Norway, Field Guide for the 3rd Annual Meeting of the IGCP project 591: Rapporter och meddelanden no. 133 http://igcp591.org/downloads/lund2013_guidebook.pdf http://igcp591.org/books.php Carlucci, J. R., D. Goldman, C. E. Brett, S. R. Westrop, and S. A. Leslie, 2015, Katian GSSP and Carbonates of the Simpson and Arbuckle Groups in Oklahoma: 12th International Symposium on the Ordovician System. Stratigraphy, 12 (2) http://ecommons.udayton.edu/geo_fac_pub/5/ http://www.micropress.org/microaccess/stratigraphy/issue-317/article-1928 http://www.micropress.org/microaccess/stratigraphy/issue-317 Dattilo, B. F., C. D. Aucoin, C. E. Brett, T. J. Schramm, 2013, Fossils and Stratigraphy of the Upper Ordovician Standard in South Eastern Indiana. Indiana University - Purdue University, Fort Wayne, indiana. http://opus.ipfw.edu/geosci_facpubs/82/ http://opus.ipfw.edu/cgi/viewcontent.cgi?article=1080&context=geosci_facpubs Haynes, J. T., K. E. Goggin, R. C. Orndorff, and L. R. Goggin, 2015, Ordovician of German Valley, West Virgina. Mid-Conference Field Trip. June 10th, 2015 12th International Symposium on the Ordovician System http://www.micropress.org/microaccess/stratigraphy/issue-317/article-1930 http://www.micropress.org/microaccess/stratigraphy/issue-317 Herrmann, A., and J. T. Haynes, 2015, Ordovician of the Southern Appalachians, USA Pre-Symposium Field Trip: June 3rd – 7th, 2015, 12th International Symposium on the Ordovician System http://www.micropress.org/microaccess/stratigraphy/issue-317/article-1929 http://www.micropress.org/microaccess/stratigraphy/issue-317 Leslie, S. A., D. Goldman, and R. C. Orndorff, 2015, 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. https://core.ac.uk/download/pdf/36202521.pdf http://www.micropress.org/microaccess/stratigraphy/issue-323/article-1968 Ray, D. C. (ed.), 2011, Siluria Revisited: A Field Guide. International Subcommission on Silurian Stratigraphy, Field Meeting 2011, 1 -170 http://igcp591.org/downloads/siluria_revisited_excursion_2011.pdf http://igcp591.org/books.php Taylor, J. F., and J. D. Loch, 2015, The Ordovician Exposed: 12th International Symposium on the Ordovician System Field Trip Guidebook for the Post-Meeting Field Trip: Central Appalachians, June 12-16, , 12th International Symposium on the Ordovician System http://www.micropress.org/microaccess/stratigraphy/issue-317/article-1939 http://www.micropress.org/microaccess/stratigraphy/issue-317 Other Publications at: http://opus.ipfw.edu/do/search/?q=Middle AND Paleozoic AND Sequence AND Stratigraphy&start=0&context=1100259&sort=date_desc Yours, Paul H