169 FERMOR: GEOLOGY AND COAL RESOURCES OF KOREA, C. I*. 
felspatliic sandstone and downwards into the still more tine-grained 
uppermost sandstones of the Talchirs. The exact point at which 
the boundai'v sliould be drawn is a matter of personal preference. 
Attention may here be drawn to the statement at the bottom 
of p. 161 of the Manual of the Geology of India, where, with refer- 
ence to the Karharbari stage, the following passage occurs : — 
' It is probable that this grou}) w ill be found to have a wider dis- 
Iribvitioii than is now known and to bo represented in all those sections 
where the Talehirs are described as conformable to the beds above thoni.' 
No fossils were, however, found in the section : but this does not 
prove their absence, and it is possible that a careful search in 
the series of thin coal seams forming horizon No. 1 (sec page 18(1) in 
the Barakars, only some 40- 50 feet above the approximate Talchir- 
Barakar boundary, might lead to the discovery of fossil plant 
remains well enough preserved to determine whether or not the 
Karharbari stage is present. 
As has been related in the previous chapter, the Talchirs lill 
up all the hollows in the pre-Talchir Archaean 
TSirs°''' °^ surface, lapping round the higher Archaean 
summits, which now appear as inhers in the 
Talchirs and were no doubt previously covered to a considerable 
extent by Talchirs, since denuded away. The deposition of detritus 
in a lake by melting ice seems a peculiarly simple method of 
filling in the depressions and gradually covering all the lower hills 
of an irregular Archaean surface. Consequently we must expect 
to find great differences in the elevation of this formation from 
point to point according to the elevation of the underlying 
Archeean surface at each spot. The .lowest levels at which the 
Talchirs occur in Korea are near its southern boundary, the lowest 
point marked on the map being 1,273 feet near Dewadand, so 
that where the Hasdo river actually leaves the State the Talchirs 
there exposed cannot be at an elevation of much over 1,200 feet. 
Along the northern edge of the Talchirs the following approxi- 
mate heights were determined : — 
Gej Nala near Rakeya ..... 1,900 feet. 
E. of Balbahara 1,678 „ 
The height of Churi Hill is not stated on the map, but it must 
be well over 2,000. feet, probably at least 2,200, which would give 
a vertical distance j of 1,000 feet between the highest and lowest 
portions of the Talchirs, supposing they had suffered no dis- 
