We can't observe the out cropping basement complex rocks in one of the areas of Ethiopia

This observation is common in many geological settings, including parts of Ethiopia, where older basement complex rocks are often covered by younger geological formations. This can be due to:

1. Extensive Volcanic Cover: Large areas of Ethiopia are covered by Cenozoic volcanic rocks (e.g., the Ethiopian Traps), which have buried older basement structures.
2. Sedimentary Basins: Younger sedimentary sequences can accumulate over the basement, obscuring its outcrops.
3. Alluvial and Colluvial Deposits: Quaternary sediments, such as those found in river valleys or at the base of escarpments, can also cover bedrock.
4. Deep Weathering: In some areas, deep weathering profiles might obscure fresh rock outcrops.