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Geology; May 2002; v. 30; no. 5; p. 391-394; DOI: 10.1130/0091-7613(2002)030<0391:FSOLAT>2.0.CO;2
© 2002 Geological Society of America
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First steps on land: Arthropod trackways in Cambrian-Ordovician eolian sandstone, southeastern Ontario, Canada

Robert B. MacNaughton1, Jennifer M. Cole2, Robert W. Dalrymple2, Simon J. Braddy3, Derek E.G. Briggs3 and Terrence D. Lukie4

1 Geological Survey of Canada, 3303-33rd Street NW, Calgary, Alberta T2L 2A7, Canada
2 Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada
3 Department of Earth Sciences, University of Bristol, Bristol, Queens Road BS8 1RJ, UK
4 Nexen Canada Ltd., 801-7th Avenue SW, Calgary, Alberta T2P 3P7, Canada

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.

Key Words: trace fossils • paleoecology • continental environment • Cambrian • Ordovician




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