Interpreting and reconstructing depositional environments of the past involves an understanding of modern processes acting on the Earth surface that can form a particular rock and/or sequence of rock layers. In the Turkana Basin, the bulk of the last 4 million years are made up of ancient river deposits. One river in particular, the Omo, has had a major influence in the Turkana Basin for this span of time. In contrast, the modern Turkwel River next to the TBI campus supplies <10% of the water and sediment into the present Lake Turkana and is believed to have played a minor role in the geologic history of the basin.
TBI field school students first Geo project involved an examination of the modern Turkwel River and comparing it to two ancient Turkwel River deposits that are ~3.6 million year old and <10,000 year old.
Task 1- Turkwel River and Fluvial Dynamics
- In this study of a modern fluvial system, students measured the flow velocity and depth across the Turkwel River. In addition, they examined the composition and size of sediment across the channel and noted different features such as ripples, laminated sand, and small dunes.