Template:Devonian graphical timeline
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- Kaufmann, B. and Trapp, E.; Mezger, K. (2004). The numerical age of the Upper Frasnian(Upper Devonian) Kellwasser horizons: A new U-Pb zircon date from Steinbruch Schmidt(Kellerwald, Germany). The Journal of geology 112 (4): 495-501.
- Algeo, T.J. (1998). Terrestrial-marine teleconnections in the Devonian: links between the evolution of land plants, weathering processes, and marine anoxic events. Philosophical Transactions of the Royal Society B: Biological Sciences 353 (1365): 113-130.