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Geology; October, 2007; v. 35; no. 10; p. 883-886; DOI: 10.1130/G23947A.1
© 2007 Geological Society of America
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Exceptionally preserved Late Ordovician biotas from Manitoba, Canada

Graham A. Young*,1, David M. Rudkin2, Edward P. Dobrzanski3, Sean P. Robson3 and Godfrey S. Nowlan4

1 The Manitoba Museum, 190 Rupert Avenue, Winnipeg, Manitoba R3B 0N2, Canada
2 Department of Natural History, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada
3 The Manitoba Museum, Winnipeg, Manitoba R3B 0N2, Canada
4 Geological Survey of Canada, 3303 33rd Street N.W., Calgary, Alberta T2L 2A7, Canada

There are few body fossil biotas known from early Paleozoic accretionary shorelines, and very few examples of Ordovician soft-bodied assemblages. This study documents two recently discovered biotas from separate sedimentary basins in Manitoba, Canada, that provide unique information about tropical shoreline communities shortly before the Late Ordovician extinction event. Each site represents a distinct depositional environment, but they share biotic elements, including eurypterids, xiphosurids, and large problematic tubes. The William Lake biota, representing more restricted conditions, includes jellyfish that are among the best hydromedusan body fossils known. Rocks at the Airport Cove site, deposited under more open circulation, contain scolecodonts and noncalcified algae. These biotas have some parallels with the recently described Middle Ordovician Winneshiek Lagerstätte, but are also similar to some Late Silurian assemblages. Considered together, early Paleozoic marginal marine deposits are a rich but as yet poorly known source of paleobiodiversity data.

Key Words: Ordovician • Lagerstätten • shoreline • taphonomy • medusae • xiphosurids • eurypterids






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