  We summarize radial velocity studies of selected stars in the old, distant
clusters Berkeley 20, Berkeley 21, NGC 2141, Berkeley 29, and Berkeley 31.
Three members of M67 were observed similarly, and those velocities compare
extremely well with prior measures. We measured the chemical compositions of
all six clusters for [Fe/H] as well as abundances of alpha elements, iron-peak
elements, and those synthesized in either the s-process or the r-process.
  For the outer disk, the abundance gradient for [Fe/H] deviates from the trend
defined near the solar neighborhood. Rather than declining with increasing
Galactocentric distance, [Fe/H] appears to reach a "basement" at [Fe/H]=-0.5
beyond R_GC = 10 to 12kpc. We find enhanced [O/Fe], [alpha/Fe], and [Eu/Fe] in
the outer disk revealing a rapid star formation history.
  An intriguing, but tentative, conclusion is that the outer disk open cluster
abundance ratios are consistent with the outer disk being formed via a merger
event. The basement in [Fe/H] and enhanced [alpha/Fe] suggest that the outer
disk formed from a reservoir of gas with a star formation history distinct from
the solar neighborhood. The open clusters may have formed as a result of star
formation triggered by a merger event in the outer disk. The ages of the outer
disk open clusters would then be a measure of when the merger occurred.
[Abridged]
