Abstract
The Upper Cretaceous Deposits of the Anambra Basin has a part of its sedimentary rock deposited in the Auchi area of Edo State. Geologic field and Sedimentological studies carried out on twenty eight (28) selected samples from a section of a road–cut show that the sediments range from fine through medium to coarse grained. Morphoscopic studies reveal subangular to subrounded outline of sand particles. These coupled with the various colours observed in the sediment, ranging from whitish sand through yellowish brown, pink and reddish brown possibly indicate a non–marine environment and a fluviatile to deltaic environment of sedimentation is suggested. Heavy mineral assemblage made up mainly of opaque, andalusite, zircon, hornblend, sphene and epidote suggest derivation from the Precambrian Igneous and medium to high grade metamorphic rocks of the underlying Basement Complex of Nigeria. 
 Keywords: Sedimentology, Cretaceous, Morphoscopic, Heavy Mineral, Provenance
Highlights
The sedimentary rock in Auchi area form parts of the Upper Cretaceous sediments of the Anambra Basin
It is bounded to the north by the Crystalline Basement Complex of Nigeria
This study aims at determining the provenance of the sediments via heavy mineral analysis
Summary
The sedimentary rock in Auchi area form parts of the Upper Cretaceous sediments of the Anambra Basin. The sedimentary rock in the basin, which continues into the West of the Niger, underlies a considered stretch of country, covering the entire land area of Agenebode, Fugar, Okpekpe, Uzairue and Auchi further west, Reyment (1965). Geologic observation reveals that the rock unit which is about 20m thick at the representative section consist dominantly of partially indurated sandstone with occasional occurrence of sandy – clay at intervals. The top of the unit is capped by reddish – brown sandy – clay at intervals. The top of the unit is capped by reddish – brown, sandy – clay intermixed with ferruginized sandstone and laterite soil
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