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From detailed abundance analysis of >100 Hamburg/ESO candidate extremelymetal-poor (EMP) stars we find 45 with [Fe/H] < -3.0 dex. We identify aheretofore unidentified group: Ca-deficient stars, with sub-solar [Ca/Fe]ratios and the lowest neutron-capture abundances; the Ca-deficient groupcomprises ~ 10% of the sample, excluding Carbon stars. Our radial velocitydistribution shows that the carbon-enhanced stars with no s-processenhancements, CEMP-no, and which do not show C2 bands are not preferentiallybinary systems. Ignoring Carbon stars, approximately 15% of our sample arestrong (> 5 sigma) outliers in one, or more, elements between Mg and Ni; thisrises to ~19% if very strong (>10 sigma) outliers for Sr and Ba are included.Examples include: HE0305-0554 with the lowest [Ba/H] known; HE1012-1540 andHE2323-0256, two (non-velocity variable) C-rich stars with very strong[Mg,Al/Fe] enhancements; and HE1226-1149 an extremely r-process rich star.

Normal and Outlying Populations of the Milky Way Stellar Halo at [Fe/H] < -2