  We report results based on 35 new spectroscopic redshifts obtained with the
Keck Telescope for field galaxies that also have photometry and morphology from
survey images taken by the refurbished HST. A sample of 24 redshifts for
galaxies fainter than I = 22 has a median redshift of z ~ 0.81. This result is
inconsistent with the lower median redshift of z ~ 0.6 predicted by the
``maximal merger models'' of Carlberg (1996), which otherwise fit existing
data. The data match an extrapolation of the CFRS, as well as predictions of
certain mild luminosity-evolution models. Nearly half of the redshifts lie in
two structures at z ~ 0.81 and z ~ 1.0, showing the presence of high density
concentrations spanning scales of ~ 1/h Mpc, i.e., the size of groups. We find
emission lines or the presence of possible neighbors in 7 of 9 otherwise
luminous galaxies with red central regions at redshifts beyond z ~ 0.7. We also
note a diversity of morphological types among blue galaxies at z ~ 1, including
small compact galaxies, ``chains,'' and ``blue nucleated galaxies.'' These
morphologies are found among local, but generally less luminous, galaxies.
Distant blue galaxies also include apparently normal late-type spirals. These
findings could imply modest bursts of star formation caused by mergers or
interactions of small, gas-rich galaxies with each other or with larger,
well-formed galaxies. This first glimpse of very faint z ~ 1 field galaxies of
diverse colors and morphologies suggests that a mixture of physical processes
is at work in the formation and evolution of faint field galaxies.
