Echinoid uk flint

[Notidanodon]

Hi guys I was wondering what your thoughts on this flint echinoid were, is it too worn to be identified? 

[Coco]

Hi,

 

It looks like Collyrites with its bivium and trivium, but we’d need better pictures from above.

 

Coco

[caterpillar]

I don't think it's Collyrites.

Collyrites has posterior ambulacras near the periproct.

Here they are near the apex

I think it's an Holasteridae.

To be sure, we need the epoch

[Notidanodon]

24 minutes ago, caterpillar said:

I don't think it's Collyrites.

Collyrites has posterior ambulacras near the periproct.

Here they are near the apex

I think it's an Holasteridae.

To be sure, we need the epoch

It’s likely cenomian or turonian, does that help?

[caterpillar]

Yes, a lot.

Collyrites is jurassic and not cretaceous.

So it could be an Holasteridae but it's an internal mold and difficult to id more.

[Notidanodon]

18 hours ago, caterpillar said:

Yes, a lot.

Collyrites is jurassic and not cretaceous.

So it could be an Holasteridae but it's an internal mold and difficult to id more.

Thanks!