Nebraska is known by vertebrate palaeontologists as the place in North America where there is a very complete Cenozoic geologic record of mammalian evolution over the last thirty-five million years or so. All you have to do is visit any of the many major natural history museums in the USA and in many countries around the world, including the UK, to see fossil skulls, articulated skeletons and large slabs of rock containing bones of fossil mammals from Nebraska to verify this assertion.
Nebraska is also the site of Cretaceous rocks containing the oldest known Cretaceous fossil flower and many other parts from fossil plants. It also contains dinosaur footprints and trackways, and skeletons of marine plesiosaurs, mosasaurs and large marine fish, as well as terrestrial and marine invertebrate fossils and marine microfossils.
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Robert F Diffendal, Jr (USA)