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GEOLOGY OF EBONYI STATE, NIGERIA

CHAPTER ONE

Geology of Ebonyi State, Nigeria – a Case of Nguzu-Edda and its Environs in Afikpo South Local Government Area

INTRODUCTION

The study area Nguzu-Edda and its environs comprises of villages in Afikpo South Local Government of Ebonyi State. Communities within the studied area include; Achara, Amancho, Amoba, Okpocha, Ekoli, Ebunwana, Ugwufiere, Ufueseni, Owutu, Ekeje, Letu, and Nguzu-Edda.

This project work tends to evaluate the fundamental factors influencing the properties of cohesive soils within the study area. These cohesive soils were found largely in Nguzu-Edda and nearby villages around the study area.

 

1.1      LOCATION, EXTENT AND ACCESSIBILITY

The studied area (Nguzu-Edda and its environs) lies geographically within longitude 70 49l E and 70 54l E and latitude 50 45l N and 50 50l N. It covers an area of 2km2 on a scale of 1:25,000. It is situated in the southern part of the Lower Benue Trough and also the southern part of Abakaliki Anticlinorium.

The studied area is made accessible through major access roads which includes Amasiri-Edda road and Abiriba-Nguzu-Edda road. Minor routes to the study area include the Owutu—Nguzu-Edda road, Ebunwana road, Ufueseni road, and a network of footpaths which were useful in locating the various outcrops within the area see Figure1.

The villages within the study area where the outcrop was exposed include; Ndiba, Amaoba, Ama-Ekpe, Amaiyi, Ebunwana, Ekeje, Ekoli, NdiOloughu, Nkawu, Okpocha, Ufueseni

1.2      AIM AND OBJECTIVES

The objectives of this study are listed below;

  1. a) To carry out detailed geologic mapping of the study area indicating the various lithologies and noting the physical characteristics of the observed lithologies within   the area
  2. b) Determine the geotechnical properties of cohesive soils, and also to investigate the factors influencing cohesive soil properties. This can be deduced from laboratory tests carried out on the samples. Comparison of these test results derived from laboratory experiments may provide empirical knowledge on the properties of these soils.

1.3      PHYSIOGRAPHY AND TOPOGRAPHY

Afikpo is about 164 square kilometers (km2) in size with an undulating topography and an elevation of about 170m above mean sea level. Notably, sandstone forms its ridge and the shale form the valley (Hulme, 1997). The shale unit underlies the bioturbated sandstone. These bioturbated sandstone have high attitude (deeply steeping strike and dips), this is probably because they have less period of exposure to erosion.

  • Drainage

 

        1. As a result of the landform of the study area, these seem to be surface water runoff. The shale underlying the sandstone also makes surface runoff possible as it does not allow for water percolation.
  • Weather and Climate1.3.3   Vegetation

 

      1. The vegetation type of the area is parkland; this is characterized by stunt trees and pockets of derelict woodland and secondary forest consisting of few shrubs with dispersed large trees and climbers (see Figure3).
      2. There are two marked seasons in the study area; the wet and the dry seasons. The wet seasons begins in March and ends in October. The dry seasons begins from October through February. These two seasons are dependent on the two prevailing winds blowing over the country at different times of the year. The dry harmattan wind from the Sahara desert prevails in the dry season ranges from 20oC to 38oC and during the rainy season temperature ranges from 16oC to 28oC. The average monthly temperature ranges from 31mm in January and 270mm in July. The average annual rainfall varies from 1750mm to 2250mm (Hulme,1997)see Figure2.

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Geology of Ebonyi State, Nigeria – a Case of Nguzu-Edda and its Environs in Afikpo South Local Government Area

 

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