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We report on the result of an ongoing campaign to determine chemicalabundances in extremely metal poor (EMP) turn-off (TO) stars selected from theSloan Digital Sky Survey (SDSS) low resolution spectra. This contributionfocuses principally on the largest part of the sample (18 stars out of 29),observed with UVES@VLT and analyzed by means of the automatic abundanceanalysis code MyGIsFOS to derive atmosphere parameters and detailedcompositions. The most significant findings include i) the detection of aC-rich, strongly Mg-enhanced star ([Mg/Fe]=1.45); ii) a group of Mn-rich stars([Mn/Fe]>-0.4); iii) a group of Ni-rich stars ([Ni/Fe]>0.2). Li is measured intwelve stars, while for three upper limits are derived.

Detailed abundances in extremely metal poor dwarf stars extracted from SDSS