English: Protichnites in the lower Potsdam Sandstone near Burke, NY. These fossils record arthropod locomotion in a subaerial environment and represent some of the oldest indicators of life traversing terrestrial environments. For a complete discussion of these fossils, please see Hagadorn, J. W., Collette, J. H., and Belt, E. S., 2011, Eolian-aquatic deposits and faunas of the Middle Cambrian Potsdam Group: Palaios, v. 26, no. 5, p. 314-334.
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