The Leduc Formation is a stratigraphic unit of Late Devonian (Frasnian) age in the Western Canada Sedimentary Basin.

[5] The Leduc Formation consists of fossil reefs that are highly porous, which makes them excellent reservoirs for oil and gas.

Stromatoporoids were the primary reef-building organisms, and rock-types range from skeletal mudstones and floatstones to finer grained muddy packstones and wackestones.

[4] The dolomitization that took place in the region has increased the porosity primarily in the more deeply buried lagoonal back reef facies.

[7] The discovery and subsequent production from the wells also led to an economic boom in Alberta, which now puts Calgary among the forefront of producers of oil in North America.

[citation needed] The Strachan and Ricinus West gas fields, discovered in 1967 and 1969, are also in Late Devonian Leduc-age reefs.

[8] The reefs were found using seismic common-depth point (CDP) techniques, which were being developed and used in the Western Canada Sedimentary Basin.

The Leduc reefs are surrounded by shales of the Duvernay and Ireton Formations and the Woodbend Group that were deposited in non-reefal, open marine environments.