Abstract: The rock units, observed in the area from bottom to top, are the Permo-Triassic Tokat Massif, Late Jurassic-Early CretaceousFerhatkaya and Carcurum formations of Amasya Group, Middle Eocene Çekerek formation and Mio-Pliocene Kemerkaş formation.Tokat Massif is represented by phyllites, marble, metavolcanites, metasediments and mica schists.Amasya Group, which overlies Tokat Massif with an unconformity, is composed of Ferhatkaya and Carcurum formations on thebasis of its lithologic and fades properties. Ferhatkaya formation starts with a thin layer of conglomerate derived from metamorphicmaterials. The formation is composed mainly of limestones except lower levels. In places brecciated fabric and often oolitic andpseuodooolitic fabrics are seen. Carcurum formation is, generally, composed ofclaystone and mudstone layers in lower levels, whilelimestones with chert layers and lenses occur in upper levels. Çekerek formation is divided in three members. These are, from bottom to top; Kozluca, Kuzualan limestone and Göynücekagglomerate members. Kozluca member generally consists of pebblestone, sandstone, mudstone, clay stone and marl alternationKuzalan limestone member contains limestone lithology with high amount of Nummulites sp. fossils in some levels. Göynücekagglomerate member is composed of a matrix made of volcanic materials and basalt and andesite pebbles-blocks. In this unit,silicificated wood, metamorphic rock fragments, recrystalized limestone and limestone blocks, mudstone and clay stone lumps andcoal seams are commonly observed.Kemerkaş formation overlying Çekerek formation with an angular unconformity, is composed mainly of alternating conglomerateand pebblestone-rough sandstone, mudstone, gypsum interlayers and travertines.