Abstract: In this study, it is aimed to determine the mineralogical and geochemical features of the rocks from theGermav Formation of Upper Cretaceous-Paleocene age belonging to Şırnak Group. The clastic and chemicaloriginated rocks of the unit show different grain size, mineralogical composition and textural relations as epiclastic(sandstone, sandstone with carbonate), pelitic (shale) and clayey-sandy carbonate (marl, sandy limestone). Rockforming minerals determined by XRD; in the order of abundance calcite, phyllosilicate / clay (chlorite, C-S, C-V,vermiculite, illite, rarely serpentine, I-C and I-V), quartz, feldspar, dolomite, hematite and goethite. According to theresults of OM, SEM and XRD examinations in the unit; there are also detrital minerals transported from metamorphicand ophiolitic units as well as diagenetic minerals. The phyllosilicate / clay minerals with different chemicalcomposition are rich in Al2O3, tFe2O3 and/or MgO. Trace element and REE concentrations are mostly observedin chlorite and least in vermiculite mineral. The contents of phyllosilicate / clay minerals when compared with thechondrite values; the patterns of the samples are distinct from each other, although the enrichments-depletions varyon the basis of the derived rocks, minerals and elements. Phyllosilicate / clay minerals exhibit significant variation/ differentiation / partition according to the chondrite and NASC compositions in terms of trace and REE contents.