Mat of flat, black fragments. Looks like chopped up cassette tape.
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...are we looking at? the thin bladed darker brown fragments?
Lots of very black rectangles, each about a centimeter wide but of varying lengths. Mostly, eel grass along this stretch comes up as green strands. Along the Fleet (the other side of the peninsular) it arrives in piles when long and brown and soft. This carpet of black fragments really is like cut up cassette tape.
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...by boats no doubt or is it dredged at all?
Indeed, I'm making an assumption about it being eel grass because of its flatness and narrowness - but it could be something else . . . ?
This, in the pictures, has been brought up on the beach with piles of other seaweeds . . . and if it is eelgrass . . . why is it black, not mouldy?
There are always bits of whatever it is so I'll find some and see what happens if a photograph is magnified. (The volume of it was what specially interested me on this occasion.)
A bit went missing when I pressed 'save' . . I don't know whether boats or dredging are involved.
Lat/Lng: 50.5, -2.5
OS grid ref: SY6777