Eli Heimans' reconstruction (1911) of the Carboniferous tree Lepidodendron, known from fossil "Stigmaria" (fossil roots) in Limburg. Drawing also shows a piece of fossil bast.
In Pittsburgh a tree fossil (lepidodendron tree) embedded in a rock was found by a man kayaking (Shaun Blackham). This fossil imprint on the rock (on the side of the river) is said to be close to 300 million years old! (Source)
Blackham got in contact with the Museum of Natural History in Pittsburgh, and they then proceeded to identify the fossil. (Source)
Source:
http://www.upi.com/Science_News/2010/09/06/Pa-kayaker-finds-ancient-tree-fossil/UPI-16511283793551/
http://www.thepittsburghchannel.com/r/24899050/detail.html
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