i'HE BARAKARS. ISS 
In column II are given the theoretical figures for pure kaolin 
(2II2O. AI2O3. 2Si02). In view of tlie crypto-cry.stallinc character of 
the concretiona as viewed under the niicroKcope the most apt term 
to apply is probably lithomarge. The pretjence of these concretions 
of lithomarge is of considerable theoretical interest, for inasmuch 
as they must have been formed by the segregation of lithoinargic 
material originally distributed through the bright coal in wliich they 
occur, thoir presence adds force to the deduction already drawn 
on page 180 that the bright coal is of the nature of a colloidal 
substance that has in some way segregated chemically from admixed 
earthy materials. The point now to be solved is why bright 
coal does not contain these lithomargic concretions more frequently. 
The coal horizons seem to occur chiefly in the lower and middle 
portions of the Barakars. Thus, whilst the 
Correlation of the altitudes of the Barakars in the Kurasia field 
coal seams. r i p r> r 
range from about 1,700 feet to 2,900 feet, 
the measured altitudes of the coal outcrops range from 1,750 to 
2,300 feet. The number of horizons is difficult to ascertain with 
certainty, owing to the difficulty already noticed of correlating the 
outcrops. But, judging from the outcrops in the Gorghela Nala 
and its tributaries, the Kurasia field has at least 6 horizons, unless 
faulting has caused duplication ; even then the number of coal 
horizons must be at least 4. These horizons are numbered 1 to 
6 from below upwards, and on the evidence of situation and baro- 
metric elevation I have attempted to correlate all the outcrops 
examined, the results being tabulated in Appendix I (see also 
pages 197, 201). From this table it will be seen that horizon 4, 
ranging in elevation from 1,864 feet (Kuar Jharia, No. 45) at the 
south-western corner of the field to 2,155 feet (Chirra Jharia, 
No. 21), in the north-eastern corner of the field, suggests a 
general, very slight, dip to the S. S. W. Workable coal seams 
appear to occur in horizons 4, 3, and 2. 
In the Sauhat field I examined only the southern edge ; the 
coal exposures ranged in elevation from 1,720 feet (Balbahara, 
No. 10) at the western end of the field to 2,307 feet (Charcha, No. 
19) towards the eastern end. They seem all to be referable to two 
horizons — if I may dare to attempt any correlation — -with the excep- 
tion of one of the Biyah Mandha Nala exposures (No. 13 ; 2,150 
feet) and the Bar Pani exposure (Charcha, No. 19 ; 2,307 feet). 
Numbering the seams from below upwards, seam 1 contains workable 
