Robert B. MacNaughton, Jennifer M. Cole, Robert W. Dalrymple, Simon J. Braddy, Derek E.G. Briggs, Terrence D. Lukie; First steps on land: Arthropod trackways in Cambrian-Ordovician eolian sandstone, southeastern Ontario, Canada. Geology ; 30 (5): 391–394. doi: https://doi.org/10.1130/0091-7613(2002)030<0391:FSOLAT>2.0.CO;2
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Basal terrestrial deposits in the Cambrian-Ordovician Nepean Formation (Potsdam Group) near Kingston, Ontario, contain arthropod-produced trackways that extend the record of the first arthropod landfall back by as much as 40 m.y. The presence of large, simple cross-beds and of wind-produced structures, including adhesion ripples and wind-ripple lamination, indicates that the host strata were deposited in an eolian dune field, probably in a marginal-marine setting. The trackways were preserved mainly as undertracks and record the activities of large, amphibious arthropods, possibly euthycarcinoids.