« on: 22/07/2014 13:41:31 »
So I'm on holiday in London, and walking by the southern bank of the river Thames (Tate/OXO Centre Area) I noticed some black pebbles on the small beach, next to the river. Upon collection and examination of the "rocks" it turn out it's bituminous coal, so lignite, organic matter, basically. The thing is there is quite a lot of it, all eroded and shaped in pebbles. Why is there coal in the Thames?