Abstract: This study concernes the recent discovery of marin sediments of lower Triassic age in Hacılar region (NÇubuk-Ankara) emphasizing its stratigraphy and foraminiferal fauna content.The lower Triassic sequence of the Hacılar region, which is called metadetritic complex, is composed of sandstone,conglomerate, siltstone, diabase, spilite and recrystallized limestone. This complex contains also limestone blocks of Permian age and some thin layered, fossiliferons limestone of lower Triassic age. According to the characteristic foraminifera found in this layered limestone, the age of lower Triassic "Scythian" has been given.