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. 2014 Jun 17;5:4194. doi: 10.1038/ncomms5194

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(a) Simplified late Campanian (75 Ma) plate tectonic reconstruction adapted from the Ocean Drilling Stratigraphic Network (ODSN) palaeomap project ( http://www.odsn.de/odsn/services/paleomap/paleomap.html). The location of the Shuqualak–Evans borehole sampled in this study is shown as a black circle; the locations of DSDP/ODP sites discussed in the text are shown as small open circles. (b) North American Palaeogeography for the Late Santonian (85.0 Ma)–Early Palaeocene (65.0 Ma) interval. The location of Shuqualak is indicated as an open circle within the outline of Mississippi. Palaeogeographic maps are drawn after the original maps (65, 75, 85 Ma) of Ron Blakey, NAU Geology ( http://jan.ucc.nau.edu/%7Ercb7/nam.html).