Friday Rock Blogging: Mud
Picture courtesy reader Martin. Or maybe Martin doesn’t actually read this blog, and it’s just Wren. Anyway, thanks, Wren and Martin!
Today’s rock is a geopuzzle: What’s up with these ridges? How did they get there, and what determines their size?
I don’t actually know the answer, so this is the best hint you’re going to get out of me.
Ellery wrote:
Based on your clue, this is clearly a strange phenomenon that exists only along the border of Wales and England, possibly due to a secret EM fence between them :)
Posted 07 Mar 2020 at 8:45 am ¶
cope wrote:
Could it be that a tidal bore moves up this waterway and when the tide drops, these ridges of sediment result from erosion?
Posted 07 Mar 2020 at 8:54 am ¶
delagar wrote:
No comment, since I have no clue — I just love Friday rock blogging.
Posted 07 Mar 2020 at 9:26 am ¶
chezjake wrote:
Just guessing here, but looking at the raised edges and their shadows, I’m wondering if this is mud that has run over a tilted slate bed, or some such similar structure.
Posted 07 Mar 2020 at 10:00 am ¶
Ben wrote:
Overbank flood deposit? Control: duration and size of flood
or
A semi careened off the m48 and into the water and created a big wave. Control: Size of semi.
Posted 07 Mar 2020 at 10:05 am ¶
Ron Schott wrote:
Well geez, let’s bring the entire aviary in on this! I think these waveforms are actually mimicking the wingbeats of an unladen swallow. The real question is… African or European?
Posted 07 Mar 2020 at 10:06 am ¶
Owen wrote:
I wonder if the pylons of the bridge there play some role in the formation.
Posted 07 Mar 2020 at 10:23 am ¶
Laura wrote:
Ooo! The M48! The road that takes me home. This picture is making me homesick for the Severn, there’s some great fossil hunting to be done along there… *sigh*
Anyway. Before I saw the larger picture I was going to say that they were current formed ripples as there is definite bifurcation on some of those crests.
Posted 07 Mar 2020 at 10:47 am ¶
BrianR wrote:
hmmm…at first glance, the features have an erosional rather than depositional look to them … I might have to agree with cope above…something along those lines.
Posted 13 Mar 2020 at 1:07 pm ¶