| Title: | Ewekoro–Ibese Limestone Outcrop, Eastern Dahomey Basin (Dangote Cement Quarry) |
| Type: | Outcrop |
| Date of visit: | 2025-08-28 |
| Investigator/Author: | Adeyemi, Olaoluwa |
| Description: | The Ibese–Ewekoro limestone outcrop exposes well-bedded, fossiliferous carbonate units of the Ewekoro Formation belonging to the Eastern Dahomey Basin. The section comprises cream to light grey biomicritic and bioclastic limestone interbedded with marl and shale partings. Sedimentary structures include lamination, burrows, and shell fragments. The formation is rich in foraminifera, echinoids, and molluscan fossils, indicative of deposition in a shallow marine inner-shelf environment. The exposure lies within the Dangote Cement Plc quarry, with beds gently dipping southwest, consistent with the regional structural trend. |
| Latitude: | 6.94 |
| Longitude: | 3.05 |
| Nearest Place,Country: | Ewekoro, Ogun state, Nigeria |
| Geographic province: | Eastern Dahomey Basin |
| How to get there: | The Ibese and Ewekoro limestone outcrops are accessible via the Lagos–Abeokuta Expressway and Sagamu–Ijebu road network. From Lagos, travel northward toward Abeokuta, then to Ewekoro or Ibese in Yewa North Local Government Area. The sites are located near the Dangote Cement Plc quarries and can be reached through factory access roads under company supervision. |
Geology: |
| Age (Chronostratigraphy): | Paleocene - Eocene |
| Geological province: | Eastern Dahomey Basin |
| Lithostratigraphy: | Ewekoro Formation (Paleocene) and Akinbo Formation (Eocene) |
| Lithology: | The Ewekoro Formation consists predominantly of fossiliferous, grey to cream-colored limestone interbedded with marl and shale layers. The Ibese section exposes well-bedded, fine- to medium-grained biomicritic limestone with abundant foraminifera, echinoi |
Legal issues: |
| Land owner: | Dangote Cement Plc (Ewekoro and Ibese quarries) |
| Acess restrictions: | Field access requires prior permission from Dangote Cement Plc management due to operational quarryi |
| Other legal issues: | Standard industrial safety and environmental regulations apply. |
