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Stephanospermum braidwoodensis: wafered sections

A sequence of wafer-cut sections through a new fossil pteridosperm ovule (Stephanospermum braidwoodensis FMNH P30420) from Mazon Creek in Illinois as described by Alan Spencer, Jason Hilton and Mark Sutton in the journal Review of Palaeobotany and Palynology. For full story see: http://fieldmuseum.org/explore/3d-x-ray-microtomography-reconstructions