Records of the Geoloyical Survey of India. 
[vol. v. 
l;’2 
search for the oil here rather less a matter of speculation than is usually the case. One thing 
is remarkable, and that is, on the supposition as advocated by me, that the naphthagenous 
beds are members of the nummulitic group. A great thickness of beds, not perhaps less 
than 2,000 feet, must he interposed between the source of the oil and its point here of natural 
discharge. These beds are more or less porous, and may hereafter possibly prove sufficiently 
rich in petroleum for profitable working, or possibly for purposes of distillation, hut nothing 
hut an experimental shaft will satisfactorily settle their economic value. 
The petroleum from the above localities is very similar and more fluid than the com¬ 
mercial or Yenan-choung oil, a difference depending, probably, more on the length of time 
either has been exposed to the air than on any difference in chemical constitution, hut no 
exact analysis has yet been made. 
Correction regarding! the supposed eozoonal limestone of Yellan bile. 
See Sec. G. S. of India, Vol. V, part 2. 
Specimens of this limestone wore sent home to Professor William King, Sc. D., of 
Queen’s University of Ireland, for examination, which has resulted in the opinion that there 
is no eozoonal structure evident. Dr. King states that the rock consists of layers of two 
or more silicious minerals, and others containing calcareous matter; the former being in 
general the thickest and most abundant. The silicious layers are of a pale dirty green color. 
Examined with a good magnifying power, they are seen to he made up of Tough grains of 
grey quartz and flattened particles of a greenish amorphous substance which appears to be 
chemically Telated to some amphibolic mineral; both kinds arc generally compacted together 
by themselves, but occasionally calcareous matter is intermixed with them. Here and there 
the layers are reddened with an iron oxide. The calcareous layers, of a dark bluish green color, 
are charged with the prementioned grains and particles, principally the latter, and often to 
such an extent as to become essentially silicious. “ In all cases the calcareous constituent is 
in the amorphous condition, neither saccharoidal nor crystalline, resembling that of ordinaiy 
blue-grey limestone. 
“ Examined after decalcification, the microscope shows the silicious layers intact except 
where they contain calcareous matters ; in this case the component grains and particles, instead 
of being closely adherent, are separated by interstitial vacancies. The calcareous layers which 
are etched out to a slight depth exhibit a large number of the green flattened particles, and 
usually a smaller number of the quartz grains standing out in relief in the undissolved por¬ 
tion, and generally lying lengthways and parallel to the silicious layers. The components 
of the latter layers also aflect a parallel arrangement. 
“ The rock, strictly speaking, cannot be called metamorphic. It resembles in texture 
some of the imperfectly developed gneissodes common in Connemara. The thickly laminated 
portions have all the appearance of being depositional in their origin. But often there are 
thin laminae folding round nuclei, seemingly concretionary, which appear to be the result of 
supervened agencies. It was a specimen of the rock in the latter state that was decalcified. 
“ The interlamination of the silicious and calcareous mineral substances, as observed 
by the unassisted eye, and its resemblance to a similar peculiarity present in certain speci¬ 
mens of Ophite from the Grand Calumet, Canada, and which alone first gave rise to the 
supposition that it represented a fossil, have evidently suggested the same idea in connection 
with the Yellanhile rock; but diligent observation with the microscope does not brmg out 
the least trace of anything approaching to the so-called ‘ canal system,’ or 1 nummuline 
layer,’ diagnosed for Eozoon.” 
