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The oldest evidence for birds in northern Gondwana? Small tridactyl footprints from the Middle Jurassic of Msemrir (Morocco)
M. Belvedere, G. Dyke, M. Hadri, and S. Ishigaki
2011
Article
Gondwana Research
19:542-549
Find it at:
http://dx.doi.org/10.1016/j.gr.2010.08.004