Frills, Fins, or Feathers?

[Chris. D. Wright]

Hi.

Can anyone help to identify what this item is at all.

To me it looks like there are three straight lines which tape from right to left and fanning out in the same direction, what appear to be some sort of lines. These lines are visible both above and below three straight lines. It was found on a beach at Corton, Suffolk.UK

 

Edited April 12, 2022 by Chris. D. Wright
Missed details of where found

[Tidgy's Dad]

Ribs of a bivalve, perhaps? 

[ClearLake]

I do not know anything about the geology of the area from which the rock came, but is cross bedding a possibility?  The Geologist in me wants to see cross bedding above and below  some thin planar beds.  What does the other side look like?  What does it look like wet? Is it limestone (if so, probably not cross bedding)?  So many questions, so few answers....

[JohnJ]

Try photographing it while damp to enhance more details.  

[Chris. D. Wright]

Hi

As suggested photograph of the rock wet.