The fabric is fine, moderately calcareous, with well sorted inclusions showing unimodal grain size distribution. This is a homogeneous group in terms of composition and size of inclusions. It is characterised by the presence of textural concentration features - clay lumps and clay striations. The inclusions consist of quartz, feldspar, chert, serpentinite, micrite lumps, and mica (both white mica and biotite). Moreover, secondary calcite is unevenly dispersed throughout a number of thin sections. The clay matrix is mottled, predominantly brown and grey in PPL, reddish brown to dark grey in XP and usually optically inactive.