...E. O. Eze; O. P. Suoware Abstract The grain size analysis and the Atterberg limit values indicate that the Ajali Sandstone falls into the A-3 and SP-SW classes of the AASHTO and the Unified Soil Classification systems respectively. The low values of the coefficient of uniformity 2.9-3.4 show...

... affecting the erodibility of soils derived from the Cretaceous Ajali sandstone which underlies large portion of the major highways within the region and have been associated with devastating erosion and landslide; and also an attempt is made to characterize them based on their susceptibility to erosion...

... Formation, (Lower Coal Measures) deposited during sea level fall in the Maastrichtian, is overlain by the Ajali sandstone (false bedded sandstone) (Reyment, 1965). The successions in the Anambra basin are capped by deposits of the Nsukka Formation (upper Coal Measures) in the Danian ( Nwajide, 2005...

.... The deposits of this period in the Anambra Basin are essentially the Awgu Shale. During the post-Santonian period that followed the formation of the Basin, an east–west-prograding delta developed, during which the Nkporo Group, the Mamu Formation (lower coal measures), and the Ajali Sandstone were deposited...

...O. K. Agagu; C. M. Ekweozor Abstract More than 2,500 m of predominantly terrigenous Senonian sediments have been penetrated in the Anambra Syncline. These sediments define three cycles of fluviodeltaic and shelf units, namely the Awgu Shale-Agbani Sandstone cycle, the Ogugu Shale-Owelle Sandstone...

... (the beginning of the third cycle). The units of the second cycle exposed in the Anambra and the Afikpo basins are the Enugu (and its lateral equivalents), the Mamu, the Ajali, the Nsukka, the lmo, and the Nanka sand Formations. AGE ST RAT IGRAPHIC SEOU~CE PETROLOGY OF SANDSTONE UNITS "c- .. ·iii U a~ to U...

... – 66 . Ellis, G. I. 1973 . Arabian Salt-Bearing Soil (Sabkha) as an Engineering Material. TRRL Report 523, Crowthorne, Berkshire. Eze, E. O. & Suoware, O. P. 1993 . Geotechnical evaluation of untreated and cement-treated Ajali Sandstone from Southern Nigeria...

... Ajali sandstone lies conformably on the Mamu Formation. It consists of characteristically friable, cross-bedded sandstones with virtual absence of clay. The Ajali sandstone which is about 406m thick is overlain by lateritic/red earth deposits. In the area, the Ajali sandstone is actively incised...

... of the Ajali and Owelli formations lie on the Mamu Formation and constitute its lateral equivalents in most places. In the Paleocene, the marine shales of the Imo and Nsukka formations were deposited, overlain by the tidal Nanka sandstone of Eocene age. Downdip, towards the Niger delta, the Akata shale...

... are dark grey and regularly alternate with the sandstones to form a characteristic striped rock. The regressive and friable Ajali sandstone overlay the Mamu Formation and is capped by the less extensive transgressive upper Coal Measures - Nsukka Formation in the Danian ( Table 1 ). Table 1...

...) used the concept of Da-zarrouk parameters to estimate the transmissivity of Ajali sandstone aquifers in Southeastern Nigeria. Ekwe et al. (2006) applied the concept of Da-zarrouk parameters to estimate aquifer transmissivities within the middle Imo River basin. Uma (1989) carried out a study...

.... A. Fayose, personal commun.). The overlying Ajali Sandstone (< 450 m; Fig. 5 ) consists of mainly friable, poorly sorted, angular to subangular, coarse to fine sandstone with planar and tabular large-scale cross-stratification. There are thin interbeds of mudstone, occasional plant impressions...

.../Nanka Formation/Nsugbe Sandstone (Ameki Group) Ameki Formation 6.5 Palaeocene Imo Formation Nsukka Formation Imo Formation Nsukka Formation 73 Maastrichtian Ajali Formation Mamu Formation Ajali Formation Mamu Formation 83 87.5 Campanian Npkoro Oweli Formation/Enugu Shale Nkporo Shale...

... E.O. Okeke H.C. Maduewesi V.U. 2012 , Tide-generated sedimentary structures, lithofacies and particle size distribution: Proxies to the depositional setting of the Ajali Sandstone in the Anambra Basin...

... into an anticlinorium. This event made the Anambra platform to subside and the depocentre to shift south-westwards to the newly formed Anambra basin and the Afikpo syncline on the southeast side of the anticlinorium. The Nkporo Group, Mamu Formation, Ajali sandstone, Nsukka Formation, Imo Formation and the Ameki Group...

..., siltstones and lateritic formation. It is within the Campanian to early Paleocene lithofacies that directly overlies the facies of the southern Benue trough. It falls in the Anambra basin, within Ajali sandstone formation. The area is characterized by the presence of surficial brown sands as presented...

... of the Ameki Group, which has similar texture and whitish colour with Ajali sandstone. This formation underlies most of the gully sites in the Anambra state. The loose nature and the low clay content of this formation appeared to be the key contributing factors to the continuous, disastrous gullying taking...

... and Mbazi, 1989 ) for the Ajali sandstone aquifer north of the Niger Delta. Like hydraulic conductivity, porosity has been evaluated for geologic materials of the Niger Delta by many researchers (e.g., Lowden, 1972 ; Etu-Efeotor and Odigi, 1983 ; Garcia-Bengochea, 1983 ; Akpokodje, 1987 ; Adesida...