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Using the values of the cosmological parameters obtained from Wilkinson Microwave Anisotropy Probe (WMAP) and the cosmological chemical clock observed by high-redshift quasars, it is shown that star formation should have started by the redshift $z_F > 9.5$, and that $z_F$ is sensitive only to $\omegamz h^2$ in flat $\Lambda$CDM cosmology

Probing the Star-Formation Epoch with the Wilkinson Microwave Anisotropy Probe (WMAP) Data and High-Redshift QSOs