Vol. 58. | CRYSTALLINE LIMESTONES OF CEYLON. 409 
band of acid granulite therein: the limestones and included ¢ sill’ 
being nearly horizontal. The band of granulite (specific gravity = 
2 63) is of avery usual type, composed mainly of elongated quartz, 
orthoclase, microperthite, and plagioclase, with some green augite, 
magnetite, and abundant prisms of apatite. There are also brownish 
fibrous pseudomorphs, perhaps after rhombic pyroxene. This band 
of granulite, 2 feet wide, is separated from the limestone above and 
below by a zone of heavy, hard, dark rock, 3 to 6 inches thick 
(specific gravity =3°2 to 3:28), composed mainly of greenish-brown 
hornblende, with more or less colourless diopside, brown mica, green 
spinel, and scapolite. The limestone near the top junction contains 
much colourless diopside, and a little olivine, besides calcite and 
some pale phlogopite. A less pure band in the limestone was com- 
posed of phlogopite, diopside, calcite, and bluish-green spinel, the 
plates of phlogopite being slightly distorted as if by pressure. 
There are also elongated silicate-lenticles in the limestone, consisting 
of dark heavy rock (specific gravity=3:09, 3°31), similar in minera- 
logical composition to the contact-rock bordering the band of 
granulite. One measures about 2 feet by 6 inches, and consists of 
diopside, hornblende, and green spinel; in another phlogopite is 
abundant, in addition to these minerals. 
(2) A small quarry, on the right-hand side of the Kandy-Anu- 
radhapura Road, just south of the 32?-milestone, is of much interest. 
Fig. 3.—Interrupted sill of pyroxene-granulite in limestone, near 
Nalanda. 
[A length of about 5 feet is shown. | 
The quarry has been opened in a wide band of crystalline limestone 
along and over which the road runs. The limestone is of ordinary 
type, in part comparatively pure (specific gravity=2°83), with 
calcite, dolomite, and not very abundant olivine. Impure varieties, 
from which knots of rusty rock weather out, are also present. These 
contain diopside, pale phlogopite, calcite, olivine, and green spinel 
(specific gravity=2°85, 2°97). There are in the limestone two 
bands of granulite, striking north and south parailel to the general 
foliation and to each other. 
The first appears as a dark band about a foot wide (fig. 3), cen- 
trally hard and compact, and resembling a pyroxene-granulite, but 
