Vol. 58. ] CRYSTALLINE LIMESTONES OF CEYLON. 407 
to showed much green augite and scapolite, with calcite (partly 
secondary), pyrite, little felspar, sphene. Whatis probably the same 
limestone is seen again in the Rakwane Ganga, Rangweltenne Estate, 
near by, and though very impure it has there been burnt for lime. 
Fallen blocks below the Herimitigala Rock, on the estate of the 
same name near Balangoda, show a beautiful, coarsely crystalline 
limestone, with abundant crystais of diopside, scapolite, and some 
also of sphene. Some individuals of calcite measure more than 
3x 1:5 centimetres. There are gradual passages from this rock to a 
handsome green and white scapolite-augite rock, strongly recalling 
certain varieties of rock occurring at Galle. The country-rocks here 
are granitoid in aspect, and more coarsely crystalline than usual. 
Cases in which a zone of green rocks is found are also common. 
In the stream-bed, north of the bridge at Talatuoya, it may be 
seen that a band of impure limestone is in contact with a wide 
zone of heavy green rocks in which the minerals diopside, biotite, 
greenish-brown hornblende and green spinel predominate (specific 
gravity =3°25, 3°31); sometimes calcite is present, associated with 
many large spinels. Similar rocks are seen on the Kandy-Talatuoya 
road, about 3? miles from Kandy at the top of the hull (see fig. 1, 
p. 404), also 33 miles from Kandy south of the lmestone-band ; 
and again south of the limestone-band at the little bridge over the 
Mahaoya, south of the Peradeniya level-crossing, where a specimen 
(of specific gravity 3°27) consisted of diopside, brown mica, and 
green spinel, the latter rendered nearly opaque by granules of 
iron-ore. 
Near the boundaries of limestone-beds, thin bands of limestone 
and granulite are sometimes found to alternate, as at Gangapitiya, 
where in the moonstone-pit the impure limestone-bands are usually 
separated from the beds of acid granulite by successive zones of 
diopside alone, and of diopside, serendibite, and spinel (with some- 
times scapolite or plagioclase), each from 2°5 to 5 centimetres broad. 
Moreover, it is often found that the limestones themselves 
become very impure near the junction with the granulitic rocks. 
Bands rich in mica, diopside, and spinel appear, as may be seen 
on the Kandy-Talatuoya road, about 5; miles from Kandy, and at 
Wattegama, east of the level-crossing, where some house-foundations 
afforded a section. Accessory minerals may, however, be quite as 
abundant in the main mass of the limestone, though here olivine 
(forsterite) is more characteristic. 
It is not unusual to find in the limestones bands of pyroxenic 
rock, identical with the pyroxene-granulites, running parallel to 
the general foliation, and of various widths up to several yards. 
These bands are, as it were, sills of pyroxene-granulite in the lime- 
stone. When quite narrow, such rocks occasionally form irregular 
snaky twists and flecks in the limestone; a quite chaotic mixture 
is sometimes thus produced. The patches weather out from the 
limestone, and look like masses of rotten ferruginous sandstone. 
A specimen of such a snaky twist had a specific gravity of 2-95, and 
consisted of a granular mixture of augite, potash, and felspar, with 
small quantities of scapclite, sphene, iron-ore, biotite, and calcite. 
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