100 million years after the Big Bang
  Dark Energy Camera on the Blanco 4 meter telescope not only has the focal
plane size the 4 meters were built for, but also has excellent near infrared
response. A DECam Deep Fields program is outlined, which can reach M* galaxies
at redshift 6 at a wavelength of one micron. What reionized the Universe, when
did globular clusters form, were there very massive stars and how did they end,
and how did supermassive black holes emerge a few hundred million years after
the Big Bang ? These are some of the questions wide field high z surveys in the
infrared will open to observational study.
