an engineering geological characterisation of tropical clays - GBV
an engineering geological characterisation of tropical clays - GBV
an engineering geological characterisation of tropical clays - GBV
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17<br />
Table 2.1 Stratigraphic correlation <strong>of</strong> rocks in the Nairobi region (Saggerson, 1991).<br />
SOUTH CENTRAL NORTH<br />
Kajiado Nairobi Kijabe<br />
(Matheson, 1966) (Saggerson, 1968) (Thompson, 1964)<br />
Soils, ashes, alluvium,<br />
Soils <strong>an</strong>d ashes<br />
RECENT Soils loess, gypsiferous beds<br />
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _<br />
Longonot trachytes<br />
Trachytes<br />
U<br />
Lacustrine deposists<br />
xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxx<br />
Sediments (K<strong>an</strong>dizi Valley)<br />
Pyroclastics<br />
PLEIST- Olorgesailie Upper Trachyte Division <strong>of</strong> xxxxxxxxxxxxxxxxx<br />
OCENE M Lake Beds rhyolites, trachyrhyolites Trachytes, Kijabe<br />
<strong>an</strong>d obsidi<strong>an</strong>s ( with basalts, welded tuffs<br />
interbedded diatomites)<br />
_ _ _ _ _ _ _ _ _ _ __ _ _<br />
xxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx<br />
Upper Trachyte Division <strong>of</strong>:<br />
Pyroclastics <strong>an</strong>d<br />
Welded tuffs & pyroclastics, Laikipi<strong>an</strong> basalts<br />
(Sattima Series/<br />
L<br />
Laikipi<strong>an</strong> lavas)<br />
Orthophrye trachyte<br />
Orthophrye trachyte, <strong>an</strong>d<br />
Limuru trachytes<br />
Alkali trachyte<br />
xxxxxxxxxxxxxxxxxxxxxxxxxxxxx<br />
Middle Trachyte Division:<br />
Ol Keju Nero basalts<br />
Tigoni & Karura trachyte<br />
xxxxxxxxxxxxxxxxxxxxxxxxx Ruiru Dam trachyte<br />
Ol Esayeti volc<strong>an</strong>ics Kabete trachyte Sattima Series<br />
Kerichwa valley tuffs<br />
Kerichwa Valley tuffs<br />
PLIOCENE <strong>an</strong>d Ol Doinyo Narok Ol Esayeti volc<strong>an</strong>ics <strong>an</strong>d<br />
agglomerate<br />
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _<br />
Lower Trachyte Division:<br />
Olorgesailie<br />
Ngong volc<strong>an</strong>ics<br />
Volc<strong>an</strong>ic Series Ol Doinyo Narok agglomerate Laikipi<strong>an</strong> lavas<br />
Ololua trachyte<br />
Nairobi / Kiambu trachytes<br />
Mbagathi trachyte<br />
Sediments & tuffs<br />
Nairobi & K<strong>an</strong>dizi phonolites<br />
Mbagathi phonolitic trachytes<br />
x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-<br />
Upper Athi tuffs<br />
Athi tuffs <strong>an</strong>d Lake Beds<br />
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _<br />
Lower Trachyte Division:<br />
Simbara basalt<br />
MIOCENE Kapiti phonolite Kapiti phonolite Simbara Series<br />
_________________________ _____________________________ _____________________<br />
PRECAMB- Basement System<br />
Metamorphic rocks <strong>of</strong> the<br />
RIAN Mozambique Belt not exposed<br />
xxx Faulting _ _ _ Erosion surface ___ Major unconformity