Combined with Hubble's visible and infrared light data, the ALMA search forms a much more complete picture of galaxy formation. Astronomers could even create a 3D map of the universe's star-forming potential, transitioning from a young period (where those gas-laden galaxies were common) to today. There's a promise of more, too. The Ultra Deep Field study covered a slice of sky for 50 hours, but a future initiative, the ALMA Spectroscopic Survey in the Hubble UDF, should cover a larger area over 150 hours. You may hear much more about the history of the cosmos in the near future.