Transactions . e of the thickenning and thinning out of the coal-measuresis very noticeable, and points to a limited area of deposition. The unproductive measures consist, where exposed, of a base of boulder? mglomerate, containing very large and rounded boulders of metamorphicrock, as well as smaller pebbles. They are contained in a fine silt likebase. Above these come bluish white, bluish green, or brownish colouredshales, which break up into needles, and are hence called needle shales. In lithological characters they reminded the writer very much of thelias shales. They overlap the boulder
Transactions . e of the thickenning and thinning out of the coal-measuresis very noticeable, and points to a limited area of deposition. The unproductive measures consist, where exposed, of a base of boulder? mglomerate, containing very large and rounded boulders of metamorphicrock, as well as smaller pebbles. They are contained in a fine silt likebase. Above these come bluish white, bluish green, or brownish colouredshales, which break up into needles, and are hence called needle shales. In lithological characters they reminded the writer very much of thelias shales. They overlap the boulder conglomerate in places as is shownby the section on the next page; this section was obtained from a cutting 8 THE KURHURBALLEE COAL-FIELD, made for the purpose of diverting the course of a stream which floodeda mine. The Talchirs are shown on the surface map, Plate I., whichis adapted from the map issued by the Geological Survey of India. _Soil with pelbles of MetamorpMc roclc &, pieces o£ - shale &c. a.—Grey Shales, Above the measures referred to come the productive coal-measures,with which this paper has more particularly and exhaustively to deal. The measures consist chiefly of sandstone of varying texture andstructure, with conglomerates, shales, duns, and coal seams, but with nofire-clay proper. The floor is either sandstone or hard shale in every sandstones easily weather and are therefore not much used. Copingstones for the platforms of stations have been made of them, but they arenot of good quality. Near the base of the productive coal-measures or Karharbari bedscomes the lower seam (or seams Nos. 1 and 2 of the Geological Survey).This seam or group of seams presents very different sections in differentparts of the coal-field, as may be seen by reference to Plate III. At Kurhurballee alone is the upper as well as the lower division worked,and there only on the east of the distiict. As the upper division recedes from the lower it diminishes in thick-ness, an
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