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Report No. 78 MINISTRY OF NATURAL RESOURCES GEOLOGICAL SURVEY OF KENYA GEOLOGY OF THE NAKURU-THOMSON'S FALLS- LAKE HANNINGTON AREA DEGREE SHEET No. 35 S.W. QUARTER AND 43 N.W. QUARTER (with coloured maps) by G. J. H. McCALL, B.Sc, A.R.C.S., Ph.D., D.I.C., F.G.S. Geologist I Thirty Shillings - 1967 JSBIC LIBRARY • KE - 1967.04 j'Wageningen lie Setherlands Scanned from original by ISRIC - World Soil Information, as ICSU World Data Centre for Soils. The purpose is to make a safe | depository for endangered documents and to make the accrued , information available for consultation, following Fair Use ', Guidelines. Every effort is taken to respect Copyright of the materials within the archives where the identification of the Copyright holder is clear and, where feasible, to contact the ' originators. For questions please contact soil.isric(â)wur.nl indicating the item reference number concerned. I GEOLOGY OF THE NAKURU-THOMSON'S FALLS- LAKE HANNINGTON AREA DEGREE SHEET No. 35 S.W. QUARTER AND 43 N.W. QUARTER (with coloured maps) by G. J. H. McCALL, B.Sc, A.R.C.S., Ph.D., D.I.C., F.G.S. Geologist |5*9> FOREWORD This report covers nearly 2,500 square miles of the central sector of the Great Rift Valley and its eastern shoulders, an area of great diversity of topography and rock-types in which are to be found many vital clues as to the origin and age of the rift. Dr. McCall's pains­ taking work in describing and unravelling all the evidence contained in this region therefore makes up a volume which is somewhat larger than the normal reports of the Geological Survey, but will nevertheless be of absorbing interest to geologists and geomorphologists. The author describes repeated rhythmic successions of lava types erupted at intervals from early Miocene times almost to the present day, and shows that the volcanic activity in the area was accompanied by major episodes of faulting which formed the Rift Valley as it is seen today. From evidence derived mainly from lake sediments intercalated with the volcanic rocks, the later of which sediments contain archaeological remains, Dr. McCall has drawn up a detailed table of the various geological events and their dates. Particular attention is given to the origin of the welded tuffs and associated rock types which cover many hundreds of square miles of the Rift Valley and its shoulders, and the author's explanation of their origin, which is something of a revolution in geological thinking, will certainly stimulate a good deal of discussion. The area's only mineral of present economic importance is diatomite, but detailed des­ criptions of hot springs and steam jets, which are locally abundant, suggest the area may be of interest on account of the possibility of utilizing geothermal energy for the generation of electricity. B. H. BAKER, 4th August 1966. Commissioner of Mines and Geology. CONTENTS PAGE Abstract I—Introduction.. 1. General Information 2. Climate 3. Communications 4. Maps 5. Acknowledgements II—Previous Geological Work HI—Physiography 1. Topography 2. Drainage (1) Drainage outside the Rift Valley (2) Drainage into Lake Baringo and Lake Hannington (3) Drainage into Lake Solai (4) Drainage into Ol Punyata Swamp (5) Drainage into Lake Nakuru and the surrounding plain (6) Drainage into Lake Elmenteita (7) Drainage into Lake Naivasha IV—Summary of Geology V—Details of Geology 1. Tertiary and Quaternary Volcanic Rocks and Associated Volcanic Sedi- ments (1) The older volcanic rocks (Miocene) (a) Samburu Basalts (i) Felspar-phyric basalts (ii) Augite- and olivine-phyric basalts (iii) Picrite-basalts (iv) Picrites .. (v) Limburgites (vi) Aphyric basalts (vii) Brecciated basalts (viii) Dyke rocks (ix) Tuffs associated with Samburu lavas (b) Simbara Basalts (i) Felspar-pyhric basalts (ii) Olivine- and augite-phyric basalts (iii) Aphyric and finely-porphyritic basalts (iv) Aphanitic basalts (v) Agglomerates (i) CONTENTS—(Contd.) PAGE (c) Rumuruti Phonolites (i) Ngelesha phonolite flows (ii) Ndurumo phonolite flows (üi) Uaso Narok phonolite flows .. (iv) Wasagess flows (v) Marmanet phonolite flows (vi) Jorokokwa phonolite flows (vii) Sipili flows (viii) Ol Arabel phonolite flows (ix) Iguamiti phonolite flows (x) Glassy phonolites (xi) Brecciated phonolites .. (d) Thomson's Falls Phonolites .. (e) Phonolites to the north of Ol Kalou (ƒ) Sattima Lavas .. (g) Laikipia Basalts (A) Rumuruti Forest Basalt (i) Ol Donyo Oliep Basalt (2) The Pliocene Volcanic Rocks (a) Mau Tuffs (6) Kwaibus and Goitumet Basalts (c) Dispei-Lake Hannington Phonolites (d) Lower Menengai Volcanics .. (e) Sirrkon Volcanics (ƒ) Bahati and Kinangop Tuffs and associated lavas (i) Pumice tuffs (ii) Graded tuffs-lacustrine sediments (iii) Trachytes and "ignimbrites" .. (iv) Claystones (v) Oramutia and Ol Bolossat volcanics (vi) Superficial deposits (vii) Turasha succession (viii) North Kinangop and Kariandusi Trachytes (3) The Lower/Lower Middle Pleistocene Succession (a) Willan's Farm Porphyritic Trachyte (b) Nakuru Lake Syndicate Quarry Phonolite .. (c) Mbaruk Basalt.. (d) Gilgil Trachyte (e) Ronda Phonolites and Phonolitic Trachytes (ƒ) Lacustrine Sediments (4) Late Pleistocene and Recent Volcanic Rocks .. (a) Elmenteita Tuff Cones (b) Elmenteita Basalts .. (c) Quaternary Eruptions of Menengai (ii) CONTENTS—iContd.) PAGE (5) Quaternary Sediments and Shore-lines (and associated tuffs) 64 (a) Nakuru-Elmenteita Basin 64 (6) Larmudiac Beds 71 (c) Baringo-Hannington Basin 72 (d) Solai Basin 74 2. Igneous Rocks .. 74 3. Geothermal Activity 74 VI—Geophysics 86 1. Seismology 86 2. Magnetometric Surveys 88 3. Gravimetric Surveys 90 4. Resistivity Surveys 92 VII—Structure 93 VIII—Mineral Deposits .. 102 1. General 102 (1) Diatomite .. 102 (2) Soda Lake Deposits 109 (3) Manganese.. 109 (4) Building Materials 110 2. Groundwater 113 3. Geothermal Steam and Juvenile Gas 118 IX—References 120 ILLUSTRATIONS Fig. 1 Isohyet diagram of average rainfall 2 Fig. 2 Drainage of the area 7 Fig. 3 Subdivisions of the Rumuruti phonolites 26 Fig. 4 Textures in volcanic rocks of the Pliocene succession 48 Fig. 5 Block diagram of the volcanic and sedimentary succession in the Rift Valley north of Gilgil 50 Fig. 6 Map of boreholes and geothermal occurrences 75 Fig. 7 Triangular diagram representing the relative proportions of anions in the waters of the area 83 Fig. 8 Sketch map showing the distribution of cracks formed by the 1928 Laikipia earthquake in relation to its calculated epicentre 87 Fig. 9 Recordings obtained in magnetometer traverses across fault zones 89 Fig. 10 Gravity anomalies in the central section of the Rift Valley 91 Fig. 11 Structure of the Nakuru-Thomson's Falls-Lake Hannington area 94-95 Fig. 12 Sketch of the dissected lava plateau to the south of Ngelesha 96 Fig. 13 Sketch of the unconformity of the Bahati tuffs on the Rumuruti phonolites to the south of Tindaress 96 Fig. 14.—Diagrammatic representation of the successive stages in the formation of the Rift Valley in the Lake Hannington sector 98 (iii) CONTENTS—(Contd.) PAGE Fig. 15 (a)—Diagrammatic section of a faced fault scarp, Gilgil Escarpment 100 Fig. 15 (6)—Progressive stages in the formation of a horst and graben structure . 100 Fig. 16.—Kariandusi diatomite mine 107 Fig. 17 (a)—Hydrology of the "ratchet" topography near Ol Joro Orok and 01 Kalou 117 Fig. 17 (6)—Hydrology of the Ol Bolossat Plain 117 PLATES Plate I—(a) Steam fumaroles above the Molo river, Arus (b) The 2,000 ft. escarpment south-east of Lake Hannington .. Plate H—(a) Rubble bands in streaky trachyte, Lion's Head, Menengai.. (6) Fluviatile sediments capped by unstrai ified lapilli tuff, Mugurin Plate III—(a) Boiling Pot, Kiboriit .. (b) Geyser, Kwaibeipei Plate IV—(a) Hot-mud crater, Kiboriit (b) Spouting springs, Kwaibeipei .. at Plate V—(a) Recent fault cutting lapilli tuff, Solai centre (6) Fault plane and breccia in Rumuruti phonolite, Subukia-Thom- sons' Falls road Plate VI—(a), (b) Fault plane in sediments, Kipipiri road Plate VII—Air photograph showing the contact between Samburu basalts and Rumuruti phonolites and the later phonolite plateau of the Dispei- Lake Hannington series Plate VIII—Air photograph showing Pleistocene grid faults disrupting the phono­ lite plateau west of Lake Hannington J Plate IX—Panorama showing Sattima and Kipipiri, the Ol Bolossat Plain and the dip-slope .. at end Plate X—Panorama of Menengai caldera at end MAPS Geological map of the Nakuru area (degree sheet 43 N.W.) Scale 1:125,000 at end Geological map of the Thomson's Falls-Lake Hannington area (degree sheet 35 S.W.) Scale 1:125,000 at end Explanation of Plates PLATE I (a) Steam fumaroles above the Molo river, Arus. (b) The 2,000 foot escarpment south-east of Lake Hannington. Hot springs are situated on' the two peninsulars in the middle distance. The screes terminating half-way down the escarpment are well seen in this photograph. PLATE II (a) Rubbly auto-breccia layers in streaky trachyte, Menengai, Lion's Head section. (b) Sediments of fluviatile origin capped by unstratified lapilli tuff, Mugurin. (iv) Explanation of Plates—(Contd.) PLATE III (a) Boiling pot, Kiboriit (Photo: R. Edmondson). (b) Geyser, Kwaibeipei. PLATE IV (a) Hot mud-crater, Kiboriit (Photo : R. Edmondson). (b) Spouting springs, Kwaibeipei. A gout of steam is blowing off a fumarole under the lake in the middle distance and the cloud above the Kwaibeipei geyser, then inactive, is behind. PLATE V (a) Recent fault cutting lapilli tuff, Milton's Farm, Solai. (b) Fault plane and breccia in Rumuruti phonolite, Subukia-Thomson's Falls escarpment road. PLATE VI QI > Fault plane in sediments within the Kinangop tuff succession, Kipipiri road. PLATE VII Air photograph, south-east of Logumkum, showing the contact between deeply dissected Samburu basalts and Rumuruti phonolites (Miocene?) on the left and the later phonolite plateau of the Dispei-Lake Hannington lavas on the right.
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  • Histories of Land Politicization, Property and Belonging in Molo, Kenya Kolben Waaranperä, Ulrika

    Histories of Land Politicization, Property and Belonging in Molo, Kenya Kolben Waaranperä, Ulrika

    Histories of land Politicization, property and belonging in Molo, Kenya Kolben Waaranperä, Ulrika 2018 Document Version: Publisher's PDF, also known as Version of record Link to publication Citation for published version (APA): Kolben Waaranperä, U. (2018). Histories of land: Politicization, property and belonging in Molo, Kenya. Lund University. Total number of authors: 1 General rights Unless other specific re-use rights are stated the following general rights apply: Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal Read more about Creative commons licenses: https://creativecommons.org/licenses/ Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. LUND UNIVERSITY PO Box 117 221 00 Lund +46 46-222 00 00 ULRIKA WAARANPERÄ LUND UNIVERSITY & MALMÖ UNIVERSITY Histories of land Politicization, property and belonging in Molo, Kenya Ulrika Waaranperä DOCTORAL DISSERTATION by due permission of the Faculty of Social Science, Lund University, Sweden. To be defended at Niagara, auditorium NI:C0E11, Nordenskiöldsgatan 1, Malmö.