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drbush

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Hi friends, can you help me with this? I went to Al Hasi city, Sulaiy formation ( Berriasian) , Cretaceous  , to the north of Riyadh and found this strange  fossils. It was a surface find; it is 20 cm long, 18 cm wide, and 3-4 cm thick. The outer face is rough and in layers , the inner surface is semicircular and smooth , similar fossils are everywhere in the same area in varies sizes . So what could it be?

IMG_2019-12-08_21-33-13 (1).jpg

IMG_2019-12-08_21-29-28 (1).jpg

20191207_143916.jpg

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When I hear the phrase 'strange fossil' my first thought is always 'rudist' which looks like a good fit in your case.

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I agree, those are fragments of rudists valves.

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theme-celtique.png.bbc4d5765974b5daba0607d157eecfed.png.7c09081f292875c94595c562a862958c.png

"On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry)

"We only well see with the heart, the essential is invisible for the eyes."

 

In memory of Doren

photo-thumb-12286.jpg.878620deab804c0e4e53f3eab4625b4c.jpg

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I think it's a Durania. They  are weird weird bivalves. Not your typical. Here is an image I found that helps with recognizing them. Some you can see how they are bivalves, others, not so much 

1e1e7314fca0d0e9d19168c2e0f889a5.jpg.9e9a2f2823640f81688ee9615c58dc29.jpg

 


 

 

 

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So what i found is the matrix where the shell was so i have to go and look for the shell or this is the bivalve but missing the top shell ?

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In the rudists, one valve (shell) formed a larger cone-like structure with a central cavity where the living tissues were located, and the other much smaller valve formed a lid.  These animals often massed to form reef-like structures.  After death, wave action and storms would commonly fragment the shells into large chunks such as you have found.

 

Don

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2 hours ago, drbush said:

If this is a rudistids and it is where is the bivalve? Did i miss the rest? Is it a single animal or a colony? 

IMG_2019-12-09_17-00-20.jpg

What you have in hand is a part of the left valve, where the animal lived. The right valve was more smaller and be used as an opercule.

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theme-celtique.png.bbc4d5765974b5daba0607d157eecfed.png.7c09081f292875c94595c562a862958c.png

"On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry)

"We only well see with the heart, the essential is invisible for the eyes."

 

In memory of Doren

photo-thumb-12286.jpg.878620deab804c0e4e53f3eab4625b4c.jpg

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@drbush, as already correctly stated, these are large segments of the lower (left) valve of radiolitid rudists. Very nice, thanks for sharing!

You may have a look at this thread, it has some radiolitids in transverse and vertical (with both valves) section as well as some segments.

Franz Bernhard

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finally I found a complete one , I went to the same area and looked for a complete one , there wear ++++ of fragments but I found a complete one , it is 40cm long , 20 cm wide and 20 diameter the Wight is 30 pounds , just to update you .

رودست.jpg

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13 minutes ago, drbush said:

40cm long

 

6 minutes ago, Creek - Don said:

Nice colored ammonite.

Something has to give.

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Very nice hippuritid rudists! 

" We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. "

Thomas Mann

My Library

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On 15/12/2019 at 6:43 PM, drbush said:

finally I found a complete one , I went to the same area and looked for a complete one , there wear ++++ of fragments but I found a complete one , it is 40cm long , 20 cm wide and 20 diameter the Wight is 30 pounds , just to update you .

رودست.jpg

 

15 hours ago, abyssunder said:

Very nice hippuritid rudists! 

Wow, what a nice "monster" !

I agree this is an hippuritid.

theme-celtique.png.bbc4d5765974b5daba0607d157eecfed.png.7c09081f292875c94595c562a862958c.png

"On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry)

"We only well see with the heart, the essential is invisible for the eyes."

 

In memory of Doren

photo-thumb-12286.jpg.878620deab804c0e4e53f3eab4625b4c.jpg

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