Electrical resistivity method was used to determine the lithologic units in Abakaliki urban through vertical electrical sounding. Abakaliki is situated within latitude 6017′ to 60 20′ North and longitude 80 5′ to 80 10′ East. The equipment used were the ABEM terrameter (SAS 300), four electrodes, hammer, four reels of wire, crocodile clips, a measuring tape and global positioning system (GPS). The survey was carried out in three locations and the average restitivity values of the five layers delineated were 903-632Ωm, 342. 13Ωm, 801.730 Ωm, 244.54 Ωm and 433.16 Ωm from top to bottom. The lithologic interpretations for the first five layers were lateritic overburden, ferruginised clay concretions, fissile shale bed, (dry), wet/ (fractured) shale and mineralized mudstone respectively.
