  Globular clusters in most large galaxies are a mixture of metal-poor and
metal-rich (bimodal), but the halo stars are almost entirely metal-rich. This
and other lines of evidence argue that the metal-poor globular clusters formed
within widely distributed 10^8-10^9 Solar masses gas clouds (supergiant GMCs)
during an early burst in which most of the gas was ejected or unused till later
rounds of star formation. New simulations of the growth of pre-galactic
potential wells in the early universe now indicate that the initial power-law
form of the globular cluster mass distribution (dN/dM ~ M^-1.8) is a miniature
replica of the mass distribution of the SGMCs themselves, which grow
hierarchically in the CDM potential wells of large protogalaxies.
