Geology of 1:50000 Sheet 291 (Obudu northwest): a preliminary report. – E. E. Ukwang, E. U. Ayara and N. E. Ayi
The northwest Obudu area belongs to the southeastern Nigeria basement complex. It is underlain by metamorphic, igneous and sedimentary rocks. The sedimentary rock, a part of the Markurdi Sandstone, underlies approximately thirty five percent of the map area. The metamorphic rocks are essentially migmatites, schists, amphibolites and quartz rock. Intrusive rocks into these metamorphic rocks are aplites, pegmatites and dolerites. The dominant tectonic signatures defined by foliations, lineations, folds, faults and long axes of inclusions are mostly trending N – S to NE – SW. Minor variations in trends include ENE – WSW and NW – SE. The area was pervasively affected by the Pan-African thermotectonic episode and the underlying rocks are similar to those occurring in the northeastern part of the Obudu Plateau and the Precambrian terrains of the adjoining western Cameroon.