Engineering and Service

Abakaliki area sits on the Albian Cretaceous sediments known as the Abakaliki Shale of the Asu –River Group. The Asu River Group sediments are predominantly shales, and localized occurrences of sandstone, siltstone and limestone intercalations. It was generally believed to have started depositing in the mid-Albian period and was deposited within the southern Benue Trough, southeastern Nigeria. Emplaced in these Asu River Group sediments are intermediates to basic intrusive, Abakaliki area sits on the Albian Cretaceous sediments known as the Abakaliki Shale of the Asu –River Group. The Asu River Group sediments are predominantly shales, and localized occurrences of sandstone, siltstone and limestone intercalations. It was generally believed to have started depositing in the mid-Albian period and was deposited within the southern Benue Trough, southeastern Nigeria. Emplaced in these Asu River Group sediments are intermediates to basic intrusive, extrusives and pyroclastics. The group has average thickness of about 2000m and rests unconformably on the Precambrian Basement. The Abakaliki Shale Formation, which has an average thickness of about 500m, is dominantly shale, dark grey in colour, blocky and non-micaceous in most locations. It is deeply folded, faulted and fractured by the series of tectonic activities which has acted on the rocks. This has given the shales the ability to house groundwater at economic quantity in some areas, while its nature as aquiclude still exist in other parts where fracturing is not pronounced. It is calcareous (calcite-cemented) and deeply weathered to brownish clay in the greater part of the formation.