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Published online by Cambridge University Press: 19 July 2016
Interstellar abundances are compared for the Milky Way disk, the Milky Way halo, the Large and Small Magellanic Clouds and the damped Lyman alpha systems among the QSO absorption line systems. While a new set of observational aspects of element formation in the Universe is emerging, including a dearth of formation activity from z=5 to z=3, the predicted signal of [Si/Fe] decreasing from high z to low z, as Type I supernovae start contributing to Fe production, has not yet been seen.