Jurassic Echinoids Dorset

[Mctapmonkey]

Can anyone help with a more specific id on these?

The larger two are from Burton Bradstock  and I assume the one on the left is a bivalve and the one on the right a sea urchin.

The smaller piece in the middle is from Charmouth and another sea urchin.

 

Both locations are jurassic and (obviously) marine.

[Tidgy's Dad]

From what I can see of the specimens, I would guess that the bivalve could be Ctenostreon and the big echinoid Clypeus.

The Charmouth echinoid looks like it's in flint, these come from the chalk beds west of Charmouth and are washed up here so it may be the Upper Cretaceous Sternotaxis plana which i have found at Charmouth many times. 

[TqB]

The big one on the right looks as if it could be a Pholadomya-type bivalve in edge view rather than an echinoid. 

[Mctapmonkey]

Thanks guys,

Having looking at both options on google image I am more inclined to the Pholadomya.

But the case is not closed and I would welcome further views.

Here are more pictures.

[Tidgy's Dad]

1 minute ago, Mctapmonkey said:

Thanks guys,

Having looking at both options on google image I am more inclined to the Pholadomya.

But the case is not closed and I would welcome further views.

Here are more pictures.

Yup, clearly a bivalve from that picture. 

[Ludwigia]

I'm also pretty sure that that's a Pholadomya.