| 21. | Sudong is the site of a major coal seam first discovered in 1918.
|
| 22. | Stratigraphically this was the lowest coal seams ever worked in the Sheffield area.
|
| 23. | Modern strip mining exposes smoldering coal seams to the air, revitalizing the flames.
|
| 24. | Adits, shafts and coal seams from that period mark the landscape.
|
| 25. | This faulting provided a pathway for meteoric water to enter the coal seams.
|
| 26. | Coal balls may be found in coal seams across North America and Eurasia.
|
| 27. | This is a mix of mudstone, siltstone, sandstone and coal seams.
|
| 28. | Pockets of explosive gas can be trapped under the earth near coal seams.
|
| 29. | Several coal seams are located in the Birch Island Run watershed.
|
| 30. | In 1862 coal seams were discovered near Raniganj and Asansol.
|
