Is this an Echinoid?

[fossil_fodder]

Found in Stroud, Glous, UK

 

Its very faint, but I think I can see 6 segments from the top view (image 2), but it also might be my imagination. The piece of rock is quite regular shaped, almost a perfect dome-shape.

 

It does have a bulge on one segment, which to me looks like its excess rock that I could attempt to clean off... but also mixed in there might be part of the better preserved outer-shell as I can see what appear to be patterns emanating from the centre... either that or they are bits of other fossils that got stuck inside this one.

 

Bottom:

 

Top:

 

Side:

 

[Manticocerasman]

it is indeed a worn echinoid fossil, only the inner cast is left.

Also, it is 5 segments  echinoids have a five part symmetry .

 

 

[fossil_fodder]

thanks very much! - I did wander about the 5 points thing, but I swear i can see 3 lines crossing it in to 6 segments... but its quite hard to see

[pachy-pleuro-whatnot-odon]

2 hours ago, fossil_fodder said:

thanks very much! - I did wander about the 5 points thing, but I swear i can see 3 lines crossing it in to 6 segments... but its quite hard to see

 

Three lines is correct, only one doesn't extend to the other side, while two do