Emuruangogolak (Emurua Kirig West, Emuruagiring)
Emuruangogolak is a Quaternary basalt-trachyte volcano located within the rift (Suguta Trough) in the central part of the Maralal area (No. 085-00-011).
Complete list of alkaline rocks and carbonatites
Emuruangogolak is a Quaternary basalt-trachyte volcano located within the rift (Suguta Trough) in the central part of the Maralal area (No. 085-00-011).
The Kajyamamuk volcano straddles the western margin of the rift and is obscured by rocks of the Oliyamur volcano (No. 085-00-021) to the west and basalts from Emuruangogolak (No. 085-00-022) and rift valley alluvium to the east.
The eastern part of the Kachila volcano is partly concealed by younger volcanic rocks from the Oliyamur and Kanatim volcanoes and in the north interdigitates with products of the Nasaken volcano (No. 085-00-017). In the south it is partly concealed by alluvium.
Ribkwo is a multi-centred phonolitic trachyte volcano with a maximum thickness of 750 m that forms a low-angle shield of approximately 50x15 km (Webb and Weaver, 1976; Key, 1987b).
Silali, the largest volcano in the northern Gregory Rift, forms a low-angle shield of 30x25 km extending the full width of the rift and rising 760 m above the rift floor. At the summit there is a spectacular elliptical caldera of 7.5x5 km with unbreached walls up to 340 m high.
Lavas of olivine basalt form plateaux in the northeast (southwest margin of the Marsabit centre; No. 085-00-09), east, a large area in the centre and a smaller area in the northwest of the Laisamis degree sheet (Charsley, 1987b). Some of the basalts contain analcime.
More than half of Mount Elgon lies in Uganda, and a fuller description of the mountain will be found under Uganda No. 170-00-024. Elgon is the fourth heighest mountain in East Africa rising to 4245 m with the upper slopes being heavily glaciated, as described in some detail by Searle (1952).
These adjacent areas contain the most westerly manifestations of volcanic rocks associated with the Gregory Rift at this latitude (Jennings, 1964; Sanders, 1963a).
This area extends westwards from the floor of the Gregory Rift, includes the Kamasia Hills, and the western wall of the rift, marked by the impressive Elgeyo Escarpment which rises over 1500 m above the valley floor, to the western rift shoulder.
Running approximately north-south in the western part of this one degree square area is a complete segment of the East African (Gregory) Rift within which lie lakes Baringo and Bogoria (formerly Lake Hannington).