## 3 Results
### Albert Rift Regional Tectonostratigraphy
#### 3.1.4. Tectonostragraphy of the Basin Area of Lakes Edward-George Basin  
Analysis of seismic data, wireline well logs, mud-logs, and other preliminary information shows that the tectonostragraphy of the Lakes Edward-George Basin is characterized by three progressive rifting phases, each influencing sedimentation patterns and structural development. The lithostragraphic information developed by interpretation from these datasets is presented here (Table 4), along with the tectonostragraphic chart (Figure 7). Pliocene Early Rifting Phase  
The Early Rifting Phase reflects the onset of rifting, and is characterized by extensional tectonics and the development of normal faults, accompanied by localized rift-floor and rift-margin volcanic activity. Sedimentation during this period was dominated by fluvial systems, with braided rivers transporting poorly sorted, angular, and immature sandstones derived directly from uplifted rift shoulders, indicative of proximal deposition with limited transport distances. The depositional environment, shaped by active faulting and limited accommodation space, highlights the interaction between tectonic uplift and sediment delivery, marking the initial phase of rift basin development. \begin{table}
\begin{tabular}{p{113.8 pt} p{113.8 pt} p{113.8 pt} p{113.8 pt}} \hline \hline
**Lithologic Unit** & **Age** & **Characteristics** & **Tectonic and Depositional Interpretation** \\ \hline Edward Formation & Late Miocene to Late Pliocene & Poorly sorted, angular, immature sandstones; fluvial systems with braided rivers. & Onset of continental rifting; extensional tectonics, lithospheric stretching and faulting leading to proximal sedimentation with limited transport distances. & Onset of continental rifting; extensional tectonics, lithospheric stretching and faulting leading to proximal sedimentation with limited transport distances. & Onset of continental rifting; extensional tectonics, lithospheric stretching and faulting leading to proximal sedimentation with limited transport distances. \\ Ngaji Formation & Late Pliocene to Pleistocene & Sandstones (fluvial, alluvial plains, deltas); claystones and siltstones (lacustrine). & Active rift expansion and subsidence; development of host and graben structures, leading to diverse sedimentation in fluvial, deltasic, and lacustrine environments. & Active rift expansion and subsidence; development of host and graben structures leading to diverse sedimentation in fluvial, deltasic, and lacustrine environments. \\ Bwambara Formation & Pleistocene to Holocene & Loose quartz sands with shell fragments; alluvial fans, braided river systems, fan deltas. & Late rift stage; tectonic uplift of rift shoulders and fault block rotation, resulting in high-energy sedimentation with reduced accommodation space. \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Lithostragraphy of the Edward Basin. Figure 7: Generalized tectonostragraphy of the Lakes Edward–George Basin. Late Pliocene to Pleistocene Syn-Rift Phase  
This Syn-Rift Phase marks a period of active rift expansion characterized by continued basin extension, subsidence, and the development of horst and graben structures through enhanced normal faulting. This tectonic activity created substantial accommodation space, leading to diverse sedimentation, with fluvial systems depositing sandstones on alluvial plains and deltas at the basin margins, while quieter lacustrine settings in the central basin accumulated finer-grained claystones and siltstones. The depositional variability reflects a rift expansion stage in which tectonic controls and fluctuating sediment supply shaped the interplay between fluvial, deltaic, and lacustrine environments. Pleistocene to Holocene Late Syn-Rift Phase  
The most recent Syn-Rift Phase signifies a late rift stage marked by continued uplift of rift shoulders alongside rift-floor subsidence and creation of new accommodation space.