
Mount Kenya is a stratovolcano that was active in the Plio-Pleistocene. The original crater was probably over 6,000 metres (19,700 ft) high; higher than Kilimanjaro. Since it became extinct there have been two major periods of glaciation, which are shown by two main rings of moraines below the glaciers. The lowest moraine is found at around 3,300 metres (10,800 ft). Today the glaciers reach no lower than 4,650 metres (15,260 ft). After studying the moraines, Gregory put forward the theory that at one time the whole summit of the mountain was covered with an ice cap, and it was this that eroded the peaks to how they are today.
The lower slopes of the mountain have never been glaciated. They are now mainly cultivated and forested. They are distinguished...