NEW OCCURRENCES OF OLDHAMIA AND OTHER TRACE FOSSILS IN THE CAMBRIAN OF THE YUKON AND ELLESMERE ISLAND, ARCTIC CANADA

Trace fossil assemblages from green and maroon argillites at 34 locali ties in the British Mountains and Barn Mountains of northernmost Yukon , and 3 localities in the Grant Land Formation of northern Ellesmere I sland contain abundant Planolites spp., Oldhamia curvata, Oldhamia fla bellata, and Oldhamia radiata, and rare Oldhamia antiqua, Oldhamia? wa ttsi (n.comb.), Bergaueria hemispherica, Cochlichnus sp., Didymaulichn us? sp., Helminthoidichnites sp., Monomorphichnus sp., Protopaleodicty on sp., and Tuberculichnus? sp. Additionally, 11 new sites in the Selw yn Mountains of north-central Yukon have yielded an ichnofauna includi ng Helminthorhaphe sp., O. curvata, O. flabellata, O. radiata, Plagiog mus? sp., Planolites spp., and unidentified small hemispherical traces . All these assemblages are interpreted as Early Cambrian to early Mid dle Cambrian, based on comparison with Oldhamia-bearing ichnofaunas of similar age in North America, Argentina, and western Europe, and on a rchaeocyathids and olenellids in overlying units.