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Rather recently I uploaded to a new fossils-related page called "Late Miocene Fossil Leaves At Verdi, Washoe County, Nevada." It's all about a fascinating paleobotanical locality not far from Reno, Nevada, where nicely preserved carbonized leaves from some 18 species of plants demonstrate that 5.8 million years ago that part of the western Great Basin Desert woul have resembled today's lush green California Gold Country, western foothills of the Sierra Nevada, from roughly Placerville south to Jackson. 
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Gerald Gibson

Your blog is impressive.  You're certainly not new at this.  I notice, though, you didn't identify them on the UK forum, only on your web page.  Are you unclear about the identification?  One of your specimens you labeled Populus Alexandri (Cottonwood) looks a lot like another Miocene leaf of Nevada, Ulmus newberryi (Elm).  However, you could be correct.  The area you collected the latter from is dated Late Miocene to Late Pliocene.  Please see the attached photo of the ancient elm leaf fossil.

---- Gerald Click image for larger version - Name: Elm Leaf.jpg, Views: 12, Size: 55.19 KB
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