Cores from three wells drilled into the Elkton Member of the Turner Valley Formation at Crossfield, Alberta, yielded numerous conodonts. These conodonts permit interregional and intraregional correlation to other sections in western Canada, to strata in the upper Mississippian Valley region, and to sections in Europe. This material came from 300 to 500 g samples taken at 5 ft (1.52 m) intervals from 0.5 in (1.26 cm) slabs of well cores.

Eotaphrus burlingtonensis and Polygnathus mehli are common and allow recognition of the Eotaphrus Subzone of the Eotaphrus-Bactrognathus Zone. This subzone can be recognized within the Turner Valley Formation at Cadomin and Moose Mountain and the lower Livingstone Formation in Bow Valley sections. This subzone also occurs in the upper part of the Burlington Formation within the type region of the Mississippian System and in the upper Tournaisian (Tn3c) of Belgium, Britain, and Germany.

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