TALCHEER COAL FIELD. 53 



of a freshet), would become mixed up and imbedded in a new deposit of 

 sand, and, when elevated, present exactly the appearance above described. 

 Periodical alternations in the direction of a current might also produce 

 similar results. If the deposit of shale were thick, it might resist dis- 

 turbing action, and after a certain period, during a gradual depression, 

 a regular alternation of bands of shale and sandstone might be produced, 

 such as is frequently seen in the beds in question. 



The area occupied by this rock in the North of the field is not consi- 

 derable. It is found at the mouth of the Tikiria, and extends for 

 about a mile along the small fault which constitutes the Northern 

 boundary of that patch of the lower beds occurring North-west of Bijgole. 

 It is covered by shales, which appear along the Southern boundary of 

 the same patch. Around Konia, on the Tikiria, it is the lowest of the 

 sedimentary beds which appears, and rests directly on the gneiss. 

 Thence it continues to the Westward, till it is cut off by the junction 

 of the small fault just mentioned, with the Konjiri and Boda- 

 berna fault, near the village of Boinpur. It re-appears to the North 

 of this, at Dourisai, East of Dereng, continuing to run between the 

 Dereng and Kerjang faults, with a Westerly dip, till covered by the 

 shales North-west of Dereng. A small patch resting on gneiss appears 

 to the North of the Konjiri and Bodaberna fault just East of Dourisai, 

 and again, somewhat to the West, a band of it covers the gneiss between 

 the Konjiri and Dereng faults. From this place, although the gneiss 

 re-appears at the surface, sandstones always cover a part of the area 

 between these faults (a distance of about a mile), and the gneiss finally 

 disappears beneath the sandstone near the village of Porah on the 

 Tikiria. Thence the latter extends, with a continued Westerly dip, till 

 covered by shales and upper beds West of Kerjang. The same bed 

 apparently re-appears to the Westward in the Tikiria valley, near Balham, 

 in Eehrakol, separated from the main body of the Talcheer field by a 

 strip of gneiss. It forms a small band running up the valley, but the 



