MANGANESK DEPOSITS OF INDIA : DESCRIPTIVE. [pART IV 
was still going on in some, however, and in these the sections were of 
course fresh. I did not see all that Mr. Maclaren records, but generally 
speaking, I agree with his description, and with the theory of the origin 
of the laterite of this locality by the metasomatic replacement of the 
rocks at the surface, as put forward in his jiaper in the Geological 
Mcuiazine} The laterite here covers a considerable area, and the 
manganese-ore is very irregularly distributed throughout it. In 
some places the laterite is quite free from manganese-ore, whilst in 
others it consists almost entirely of manganese-ore. In spite of the 
large area over which the laterite of this locality is spread, so that it 
seems necessary to designate it 'high-level laterite,' yet I do not think 
it is necessarily of the same origin as the high-level laterite of the Cen- 
tral Provinces and Satara, nor that Mr. Maclaren's theory as to its 
origin is applicable to all high-level laterite. I think rather that the 
occurrence of manganese-ore at this locality is to be classified with those 
occurrences in other parts of India, such as Mysore and Jabalpur, that 
I have found it advisable to distinguish by the term 'lateritoid' to avoid 
confusion with the true high-level laterites. In fact the Talevadi oc- 
currence may be regarded as a connecting link between the true lateri- 
toid occurrences of Mysore and other parts, and the true high-level lat- 
erites. As in Mysore, some of the nodules of lead-like psilomelane 
have an outer shell of wad, from which, into the psilomelane, there 
seems to be a gradual passage. 
I must notice, however, that the lateritic rock of this locality does 
not all seem to have been formed at the same time. Thus in one place 
where work was being carried on ac the time of my visit there seemed 
to be a considerable body of ore. As exposed it was 24 paces long in an 
N. 30° E. direction, 11 paces broad, and 8 feet deep. This mass seemed 
to be practically all manganese-ore, except for patches of laterite in 
it here and there. The ore consists of psilomelane (both lead-like and 
dull grey) and wad, the former predominating. At the N. E. end of 
the working this ore-body gives place to laterite containing masses of 
psilomelane up to 6 and 9 inches in diameter. This ore is mostly hard 
bright grey psilomelane of considerably better quality than the ore in 
the ore-body. These included pieces of manganese-ore look in fact as 
if they are older than the enclosing laterite, and as if they are being 
corroded by the latter in the same way as I have noticed in the Sandur 
deposits (see page 1029). Of this I could not be certain, however. But 
5 Vol. Ill, Dec. V, pp. 636-547. 
