First steps on land: Arthropod trackways in Cambrian-Ordovician eolian sandstone, southeastern Ontario, Canada

@article{MacNaughton2002FirstSO,
  title={First steps on land: Arthropod trackways in Cambrian-Ordovician eolian sandstone, southeastern Ontario, Canada},
  author={Robert B. MacNaughton and Jennifer M. Cole and Robert W. Dalrymple and Simon J. Braddy and Derek E. G. Briggs and T. D. Lukie},
  journal={Geology},
  year={2002},
  volume={30},
  pages={391-394}
}
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… Expand
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TLDR
The Potsdam dunes show no evidence of terrestrial vegetation, suggesting that the arthropods probably returned to the sea for sustenance, however, their foray on shore demonstrated that they had evolved mechanisms for breathing air and preventing fatal dehydration, features that primed their lineage to permanently colonize land later in the Paleozoic. Expand
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