Recent discoveries of previously unknown fossil forms have dramatically transformed understanding of many aspects of the fish-tetrapod transition. Newer paleobiological approaches have also contributed to changed views of which animals were involved and when, where, and how the transition occurred. This review summarizes major advances made and reevaluates alternative interpretations of importa...

Late Devonian time was a period of rapid upheaval in the Earth system, including climate change, sea level changes, widespread ocean anoxia, and Frasnian-Famennian mass extinction; cause(s) these changes remain(s) uncertain. The Lennard Shelf Canning Basin Western Australia contains carbonate reef sections spanning much Epoch has been sampled for paleomagnetic analysis with studies by Hansma co...

The Earn Group of central Yukon records the transition from a passive to an active margin along western Laurentia in Late Devonian. Fine-grained clastic rocks and chert lower contain late Early Middle Devonian fossils were deposited offshelf environment. upper comprises mixture sandstone conglomerate, fine-grained siliciclastic rocks, widespread crystal lithic tuff. Zircons this succession are ...