We highlight some results from our detailed abundance analysis study of 703 kinematically selected F and G dwarf stars in the solar neighbourhood . The analysis is based on spectra of high-resolution ( R = 45 000 to 110 000 ) and high signal-to-noise ( S / N \approx 150 to 300 ) . The main findings include : ( 1 ) at a given metallicity , the thick disk abundance trends are more \alpha -enhanced than those of the thin disk ; ( 2 ) the metal-rich limit of the thick disk reaches at least solar metallicities ; ( 3 ) the metal-poor limit of the thin disk is around [ Fe / H ] \approx - 0.8 ; ( 4 ) the thick disk shows an age-metallicity gradient ; ( 5 ) the thin disk does not show an age-metallicity gradient ; ( 6 ) the most metal-rich thick disk stars at [ Fe / H ] \approx 0 are significantly older than the most metal-poor thin disk stars at [ Fe / H ] \approx - 0.7 ; ( 7 ) based on our elemental abundances we find that kinematical criteria produce thin and thick disk stellar samples that are biased in the sense that stars from the low-velocity tail of the thick disk are classified as thin disk stars , and stars from the high-velocity tail of the thin disk are classified as thick disk stars ; ( 8 ) age criteria appears to produce thin and thick disk stellar samples with less contamination .