In Alberta, Canada, the Leduc and Duhamel reefs of the Upper Devonian Woodbend Group are surrounded by calcareous shale and argillaceous limestone of the Ireton Formation and the underlying Duvernay Formation. The variable content of strontium, barium, and calcite in samples from interreef sediments reflects the presence of adjacent reefs. Strontium and calcium contents increase and barium content decreases in the vicinity of known reefs. Strontium content was found to be the best reef indicator.

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