Devonian
Links
The Devonian
http://www.ucmp.berkeley.edu/devonian/devonian.html
An overview of the period from the UC Berkeley Museum of Paleontology.
Devonian Geography
http://vishnu.glg.nau.edu/rcb/Devonian.html
Description and maps of the continents as they existed at the time.
The Red Hill Story
http://www.kcsd.k12.pa.us/~renovohp/dig/story/
A description of this location, with maps showing its position on the Laurussian continent.
Palaeozoic Forests
http://www.uni-muenster.de/GeoPalaeontologie/Palaeo/Palbot/ewald.html
A description of the colonization of the land by vascular plants and the formation of the first forests in the Devonian.
Sarcopterygii
http://tolweb.org/tree?group=Sarcopterygii&contgroup=Gnathostomata
A cladistic diagram, with extensive references to scientific papers on the subject.