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Quer

Rudists' casts ?

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Quer

 

Hi everyone,

 

Some weeks ago, I found those pair of pieces at the foot of a Pyrenees cliff (Maastrichtian limestone strata), which was stuffed with rudists (radiolidae).

They have an extremely smooth surface that confused me.

DSC_0394.thumb.JPG.ceb1b9f24c0cf1404d2bb73754417d0f.JPG

DSC_0387.JPG.28992d9e3466a2a8c3c28d1bcebbf15f.JPG

 

After some fantasies about teeth, bones and so on, I realized that the clue had to be around.

My ID guess is: rudist's (radiolitidae) casts, separated from shell by wheatering and erosion.

I'll explain it with some pictures taken at the same place, inserted in a fictional sequence (I do not intend they are same species or genus):

Radiolitid.JPG.5957bac3828f38ff7b165159919ca57d.JPG

DSC_0321_r.thumb.JPG.99b03c878fc10afa56af25d374fbc61d.JPGDSC_0199_r.thumb.JPG.3353b68630a856c7e30176f4fd8738cd.JPG

  DSC_0390.JPG.ff57bfa390f78a2f5ae74309cf828fa0.JPG

 

Do you think my guess is correct ?

 

Thanks,

Edited by Quer

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abyssunder

You are correct. Those are the "cores" of rudist lower valves, the sediment infilled body cavities.

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Tidgy's Dad

+ 1 for your guess they are rudists. :)

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fifbrindacier

Hi, neighbour, i also agree with rudists.:dinothumb:

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FranzBernhard

Yes, like abyssunder said, these are inner casts of the lower valves of radiolitid rudists.

Are there fragments of the upper valve in one ot the images? I have found such a cast myself in my area, with the upper valve still attached.

Franz bernhard

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Quer

Thanks to everyone, my little enigma is solved.

 

I fear not, Franz. In fact, I have a few complete rudist pieces, some upper valve pieces, but they are Hippuritid pieces (well, I think).

Radiolitid upper valves are the rarest thing. I only have this little fragment:

 

DSC_0082.thumb.JPG.7e204501c03a64cd0f694f86dcc00fcf.JPG

 

Btw, I'm working on this upper valve. It shows clearly its structure of canals & pores, and maybe its teeth & myophore can be found below.

 

  DSC_0400.JPG.d9730d072e3b5967e2fa2c3ebbb4c05a.JPGDSC_0432.JPG.cc7ea5141e15c6121c79d48edddd9de4.JPG

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