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The Kerek Formation in Sojomerto, Kendal, Central Java is the westernmost part influenced by the Kendeng zone. The presence of sandstone lithofacies in the study area can be a useful tool for determining composition and the provenance. This study involved field observation and analysis of eight thin sections of sandstone from the field. There is no notable petrographic difference across the sandstone succession in the study. the sandstones are predominantly composed of lithic components (48%-63%), matrix (2%-16%), and quartz (1%-24%) thus classified as lithic arenite and lithic wacke. The combination of quartzfeldspar-lithic (QFL) diagram indicates that the sandstone in research area was the result of volcanic activity which is in the southern part of the study area.