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Oxytropidoceras posted a topic in Fossil NewsRare fossils provide more detailed picture of biodiversity during Middle Ordovician by University of Kansas https://phys.org/news/2019-06-rare-fossils-picture-biodiversity-middle.html The paper is: Kimmig, J., Couto, H., Leibach, W.W. and Lieberman, B.S., 2019. Soft-bodied fossils from the upper Valongo Formation (Middle Ordovician: Dapingian-Darriwilian) of northern Portugal. The Science of Nature, 106(5-6), p.27. https://www.researchgate.net/publication/333371024_Soft-bodied_fossils_from_the_upper_Valongo_Formation_Middle_Ordovician_Dapingian-Darriwilian_of_northern_Portugal https://www.researchgate.net/profile/Julien_Kimmig http://dx.doi.org/10.1007/s00114-019-1623-z PDF files of other papers about soft-bodied fossils at: https://www.researchgate.net/profile/Julien_Kimmig Yours, Paul H.
JGSL The Winneshiek biota: exceptionally well-preserved fossils in a Middle Ordovician impact crater Derek E.G. Briggs, Huaibao P. Liu, Robert M. McKay and Brian J. Witzke Journal of the Geological Society, 175, 865-874, 24 September 2018, https://doi.org/10.1144/jgs2018-101 Cannot recommend this one highly enough size:about 8,5 MB Note:the Ames impact straddles the Arbuckle/Simpson Boundary