Transactions . a somewhat similar state of things. Theanticlinal axis, prolonged into the metamorphic rocks, and a small basin ofunproductive coal-measures, lie to the north of the productive coal-field. The following facts, selected from a multitude of examples, will showthe difficulty in giving one general section of the coal-field. Had the writer attempted one general section only, the most im-portant feature of the field would have been overlooked, viz., the alterationof thickness of seams and enclosing strata. VOL XXX—1880. 10 THE KURHURBALLEE COAL-FIELD, At Serampore, within a distance o
Transactions . a somewhat similar state of things. Theanticlinal axis, prolonged into the metamorphic rocks, and a small basin ofunproductive coal-measures, lie to the north of the productive coal-field. The following facts, selected from a multitude of examples, will showthe difficulty in giving one general section of the coal-field. Had the writer attempted one general section only, the most im-portant feature of the field would have been overlooked, viz., the alterationof thickness of seams and enclosing strata. VOL XXX—1880. 10 THE KURHURBALLEE COAL-FIELD, At Serampore, within a distance of 200 yards, the parting betweenthe two beds of coal thickens in the manner shown in the sketch. Ft in | 2 6 S • 3 9 0 W F< in 2-0 37 • II 14. O About 200 yards At Kurhurballee, in the part of the coal-field on the north dip, thefollowing may be noticed. It will be seen that 2 feet of coal has dwindleddown to 2 inches, and 3 feet to 3 inches, the parting stone increasing from1 foot to 7 feet 7 9 ? 0 In O ?? 2 77 0 ?? 3 6 - 7 14 0\ 113 II The writer has therefore adopted the plan of giving four generalsections of the field in four places shown on the surface map. The evi- WITH SOME REMARKS ON INDIAN COALS. 11 dence, from which these general sections are obtained, is also shown in theshape of pit sections or sections of borings. The first part of the field that will be noticed is that lying north ofthe anticlinal. The seams are here faulted and disturbed, the dip varyingfrom a few degrees to 30 or 35 degrees. The section on C D gives the general conditions under which thecoal seams occur. They abut, after dipping towards the north, against themetamorphic rocks, which form the boundary in other parts of thefield. The strike of the seams forms a semi-basin, as will be seen by thesurface map. The fault which brings up the metamorphic rocks, formsthe northern boundary. On the eastern side of the field there is a much larger developm
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