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The turtles are referred to the genus Testudo, but have some affinity to Emys. On the whole, the Nebraska formation is probably newer than the Paris gypsum, and referable to the Lower Miocene period, as above defined. Eocene Areas of North of Europe. Upper Eocene of England. Bembridge Beds. Osborne or St. Helen's Beds. Headon Series. Fossils of the Barton Sands and Clays. Middle Eocene of England.
These shells, especially the latter, are very characteristic of the Lower Miocene, and their occurrence in the Headon series has been cited as an objection to the line proposed to be drawn between Miocene and Eocene.
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