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Hell Creek ankylosaurs?



http://tolweb.org/tree?group=Nodosauridae&contgroup=Ankylosauria says
neither ankylosaurids nor nodosaurids are known from the end-Maastrichtian.
http://www.dinosauria.com/jdp/misc/hellcreek.html#dinosaurs says that
*Ankylosaurus magniventris*, less diagnostic ankylosaurid remains, and
possibly *Edmontonia* sp. are known from the Hell Creek Fm. Which is wrong?
Many thanks in advance.

:-)