Two Am Law 200 firms with longtime ties to the Great White North are advising alongside two top Canadian firms on a $3.8 billion oil and gas merger this week that will create the largest producer in North Dakota’s lucrative Bakken Shale formation.

The effects of the energy boom in North Dakota have been well-documented in recent years, from the strains on the state’s small legal services market to an influx from those practicing the world’s oldest profession.