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GENERAL REPORT ON THE RESIDENCY OF SINGAPORE. 622 
strike N. W. and S. E., at the north end of Simakow shales dip , 
90° strike N. and S.—at Jong, argillacious shales are found much 
distorted, at Sikijang Bera there are sandstones and shales striking 
N. W. and S. E., but the dips vary from perpendicular to horizon¬ 
tal, and are seen to anticlinate in one place, at Peak island are 
sandstones and shales, irregularly deposited. At Alligator, Barn 
island, Rabbit and Coney; sandstones and shales compose the forma¬ 
tion. At Blakan Mati, Pulo Brani, Sikukur and the northern shores 
of New Harbour, are sandstones and shales of nearly perpendicular 
dip with the usual strike of north west and south east. At Tanjong 
Pagar, Tanjong Mallang and Teluk Ayer, is found the same 
formation but the strata are very irregularly tilted up and displaced. 
All Tanjong Pagar district is composed of sedimentary rocks varying 
between blue red and chocolate coloured argillaceous shales to 
indurated and soft sandstones, the dips are irregular, but the strikes 
bear about N. W. and S. E. The south and east portion of Clay¬ 
more district conforms to the above description, excepting in the 
case of Mount Sophia and Bukit Seligi, where blocks of sand¬ 
stone broken up and irregular are found, the same is found to 
exist on the south, east and west frontage of Government hill, the 
north frontage is composed of strata of clays and shales. In the 
south portion of Tanglin district are also found clays and shales 
dipping perpendicularly with a N. W. and S. E. strike. The 
south eastern boundary of Toah Pyoh, the north west of Rochor, 
the north part of Kallang and south part of Amokiah are found 
to contain sandstones, Siglap and landward also appears of the 
same formation. Granite has been observed one mile N. W. of 
Kaliangdale sugar works, also behind to the north of Balestier’s 
estate, again near Perth hill, Green hill, Monks hill and the Briai‘3 
—further in many parts of the interior such as at Bukit'Timali, 
Bukit Ulu Mandai, Bukit Panjang,* in Toah Pyoh Lye and Toah 
Pyoh and the soils in the vicinity of those parts of the interior of 
the island of Singapore, always betoken a granitic origin. 
With the above recorded observations, added to many that have 
not been noted down, I draw the following general conclusions as 
to the disposition of the geological formations of the Singapore 
residency. 1st that the western and southern portion of the island, 
amounting to about ths of the whole, (with the exception of a 
small granitic patch at Pulo Pirgam) together with all the islands 
adjacent, are composed of shales and sandstones of irregular dip, 
but whose general strike is N, W. and S. E. 2nd that the centre 
and northern portion of the island, amounting to T f t ths of the whole, 
is composed of granites. 3rd that the middle of the South Eastern 
portion stretching along the Coast, and amounting to ^th of the 
whole, is alluvial. And 4thly that the remaining eastern portion 
(with the exception of a granitic patch near Changie) is composed 
of sandstone whose strata are nearly level, and which is connected 
* Mr J. R. Logan. 
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