Records from Lake Magadi, Kenya, suggest environmental variability driven by changes in Earth’s orbit

Rift Valley lakes within eastern Africa range from freshwater to highly alkaline systems and are homes to diverse ecosystems. These Rift Valley lakes are also sedimentary repositories, yielding a high-resolution environmental record that can be targeted to better understand the environmental and climatic context of human evolution over the past few million years in eastern Africa.

source https://www.sciencedaily.com/releases/2021/09/210921134350.htm