Many thanks to everyone who supports this ever popular thread. Why not join in if you have taken a shot you are pleased with? I'll pop some of my favourites up in notices from time to time - to cancel the notice, clck the X top right.
caving_fox said:Is that on a ridge? Water lapping in on both sides, but not quite overflowing?
Pitlamp said:They look like something I've seen in Peak Cavern's Far Sump Extension.
If so, are they formed by unidirectional flow eroding the mud deposit? Clay particles get stuck to each other by molecular forces and don't then separate easily. It can lead to unusually shaped residues when they're partially eroded by moving water, when some parts of the sediment are better bonded than others.