1848.] Ball Coal of the Burdwan Mines. 59 



brought down by the Digaro, as they are more numerous near the 

 mouth of that river. 



16. Limestone boulders from a little below the Khund. As we 

 ascend the river, the boulders become larger, some of them consisting 

 of pure white Marble. 



Iron. 



17. Clay from Golaghat, containing granular Iron Ore. 



18. Sulphuret of Iron from the Jamuna falls. 



Miscellanea. 



19. Pipe Clay from the Nambar falls. 



20. Pipe Clay from the Jamuna falls. 



21. Fragment of a rock near the hot spring. Burr a Noong poong. 



22. Fragment of a rock at the Nambar falls. 



23. Fragment of a rock forming a rapid in the Hurrio Jan. 



24. Fragment of a rock on the Tokaphang Naga hills. 

 25 Fragment of a rock at the Jamuna falls. 



26. Fragment of a rock on the Mikir Hills. 



27. Fragment of a rock on the Mikir Hills, Jamuna falls. 



28. Sandstone from the first hill banks of the Sundra river. Clift 

 nearly perpendicular. 



29. Sandstone from a high clift about 3 miles above No. 28. 



30. Conglomerate forming faults ? in the high clifts of Nos. 28 and 29. 



31. Fragments of Granite boulders from the bed of the Sundra. 



32. Fragment of the rock at the Brahma Kunda. 



Examination and Analysis of the Ball Coal of the Burdwan Mines, 

 by Henry Piddington, Curator Museum Economic Geology. 



The Museum is indebted for this specimen to D. Williams, Esq. the 

 Government Geologist, who informs me that these singular balls are 

 very common in the Burdwan mines, though I am not aware that they 

 have ever been noticed before. He says they are of all sizes, from that 

 of a Cannon ball, to a man's head, and even 18 inches in diameter. 



Like the Burdwan, and many English kinds of coal, these balls are 

 composed of alternate layers of a bright bituminous and a dull jetty 

 kind of coal, splitting easily between the layers. Our specimen was 



i 2 



