The Enticho Sandstone is a
geological formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock expo ...
in north
Ethiopia
Ethiopia, officially the Federal Democratic Republic of Ethiopia, is a landlocked country located in the Horn of Africa region of East Africa. It shares borders with Eritrea to the north, Djibouti to the northeast, Somalia to the east, Ken ...
. It forms the lowermost sedimentary rock formation in the region and lies directly on the
basement rocks. Enticho Sandstone consists of
arenite that is rich in quartz. The formation has a maximum thickness of 200 metres. Locally, its upper part is