CHAP. 3.] KARNÜL FORMATION.—JUMMULMUDGOO GROUP. 19 
which we see now. It is not at all improbable either that some of 
the limestone beds, even after their having become hard, permitted of 
sand being washed into their crevices of fracture and were subsequently 
altered until the rock ran together again in one uniform mass. 
E. Mr. Foote more particularly examined these 
> . ۰ 
B Eoolc motes. shore-beds and refers to them in his progress 
reports as follows :— 
* On the banks of the Toongabudra below Kurnool, the section in which the 
contact of the Jummulmudgoo limestones with the older metamorphic rocks is best 
seen occurs at Shaitancottah (Chatumcottah of map) on the right bank of the river 
about five miles above the confluence with the Kistnah." 
* The very bottom laminz of the limestone contain numerous small chert pebbles و‎ 
and in a few small patches the limestone has almost disappeared, being replaced by 
a pebbly quartzite. The limestone follows all the inequalities of the gneiss surface, 
and adheres with considerable tenacity. The beds have a slight dip to the east. To 
the east of the village, the limestone forms a low but picturesque line of cliffs along the 
south bank of the river; and in several of the gullies are small examples of ‘ swallow 
holes.’ There is a rather remarkable bed of quartz, chert, and jasper gravel covering 
the limestone surface for a considerable distance inland from the edge of the cliffs and 
extending for about a mile eastward from the village of Shaitancottah.” 
i * The contact of the limestone with coarse syenite is also to be seen in the bed 
of the Toongabudra, when notin flood, on the right bank opposite to Alumpoor. 
The limestone dips at a low angle towards the town.” 
* Close to the Kistnah the juxtaposition of the granitie rocks of the Doab with 
the limestone is well seen at the village of Chundoor, near the embouchure of a large 
nullah which flows into the Kistnah. The limestone is seen resting on the granite, 
which is here traversed by a dyke of purplish green trap, which for a distance of 
several hundred yards directly underlies the outcrop of the limestone. The base of 
the limestone is not pebbly in this section, but there is an abundance of jasper in it in 
the shape of strings and concretionary lumps, many of the cavities in the jaspery parts 
of the rock being lined with minutely mammillated botryoidal reddish chalcedony. 
Many very fine specimens of red and white (chalcedonic) jasper are here procurable. 
Where most jaspery, the limestone is of greenish blue or purple color. A foot or two 
above the line of contact the limestone is of dark or moderately dark-blue color, and is 
a tine compact building stone; very extensively developed in a south-east and south 
direction, especially at Murramoongaul and Pangtoor. Where the limestone rests 
on the trap dyke above mentioned a singular breccia has been formed by the infiltra- 
tion of caleareous and silicious matter through the innumerable small joint-fissures 
ados) 
