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Stratigraphic Units – Western North Dakota. 55.8 Ma. Thanetian Stage. Wikipedia Paleocene http://en.wikipedia.org/wiki/Paleocene NDGS Paleocene https://www.dmr.nd.gov/ndgs/NDNotes/ndn9_h.htm Royer – leaf margin analysis
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Stratigraphic Units – Western North Dakota 55.8 Ma Thanetian Stage
Wikipedia Paleocene http://en.wikipedia.org/wiki/Paleocene NDGS Paleocene https://www.dmr.nd.gov/ndgs/NDNotes/ndn9_h.htm Royer – leaf margin analysis http://images.google.com/imgres?imgurl=http://droyer.web.wesleyan.edu/LeafMarginAnalysis.gif&imgrefurl=http://droyer.web.wesleyan.edu/research.htm&usg=__MWZeAdRCjNFK1b3EALfBRFbz_GA=&h=652&w=883&sz=14&hl=en&start=1&um=1&itbs=1&tbnid=F0ZHSoJgKN37sM:&tbnh=108&tbnw=146&prev=/images%3Fq%3DWolff%2BLeaf%2BMargin%2BAnalyses%26um%3D1%26hl%3Den%26sa%3DG%26rlz%3D1T4GGIR_enUS215US215%26tbs%3Disch:1