187 FERMOll : GEOLOGY AND COAL RESOURCES OF KOREA, C. P. 
Although fossil plants are not uncommon in the coals and 
., associated shales and sandstones, yet few eood 
specimens were obtained. il)e plants noticed 
(identified by Babu Bankim Bihari Gupta) were Glossopteris indica, 
Verlebraria indica and Schizoneura. 
At one locality, Upper Dubpani (Kurasia, No. 30), the coal contains 
concretions of numerous curious white bodies. 
^Concretions of Utho- rpj^^y ^^.^ confined to the bright layers, and ap- 
peared, when the coal was broken out of the bank 
in the course of sampling, as white spots suggesting splashes of white- 
wash. On examination these spots are found to be flattened spheres or 
oblate spheroids averaging about \ inch in diameter, and consisting of a 
soft white minutely crystalline aggregate. These bodies are surrounded 
by a very thin brown coat, and this by a shell of black coal. 
From these bodies as nuclei, cracks radiate out into the bright 
coal in such a way as to suggest the petals of a flower, five in 
number, giving the whole structure a total diameter of | to 1 
inch. The general suggestion is of winged seeds, but there seems 
to be little doubt that the white bodies are of inorganic origin, 
probably concretionary ; the cracks radiating from the nuclei have 
been caused, doubtless, by a different coefficient of expansion for 
the nuclei and for the surrounding coal. Under the microscope 
the white nucleus is seen to be crypto-crystalline like chalcedony, but 
its softness, of course, precludes it from being this mineral. A 
quantitative chemical examination of these spheroids carried out 
by Babu Aj it Kumar Banerjee, Assistant Curator, gave the result 
shown in column 1 : — 
I 
II 
'i SiOg 
45-94 
46-5 
A1203 
40-03 
39-5 
MgO 
trace 
HgO 
14-02 
14-0 
Total 
99-99 
100-0 
