Archaeopteris is an extinct genus of tree-like plants with fern-like leaves. A useful index fossil, this tree is found in strata dating from the Upper Devonian to Lower Carboniferous ({Period span/brief|Upper Devonian|Lower Carboniferous}), and has a global distribution. Until the 2007 discovery of Wattieza, many scientists considered Archaeopteri...
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http://en.wikipedia.org/wiki/Archaeopteris
fossil genus of plants originally—and sometimes still—considered early tree ferns in the order Protopteridales but now generally and tentatively ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/a/95
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