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drbush

??? fossil

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drbush

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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TqB

I think rudist fragments too. 

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fifbrindacier

I agree, those are fragments of rudists valves.

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Manticocerasman

+1 for rudist.

 

mabey @FranzBernhard can tel you something more about them.

 

 

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Rockwood

+1 for strange fossil rule ;)

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Creek - Don

Rudists

 

 

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caterpillar

Radiolites?

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Tidgy's Dad

Very nice and interesting finds.:)

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drbush

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

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drbush

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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Creek - Don

That is the fossilized shell. They are rarely found intact.

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FossilDAWG

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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fifbrindacier
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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FranzBernhard

@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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Creek - Don

Nice colored ammonite.  Oringinally,  shell of these ammonites resemble like this.  Shiny and glossy. 

Preserved ammonite shell2.JPG

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Rockwood
13 minutes ago, drbush said:

40cm long

 

6 minutes ago, Creek - Don said:

Nice colored ammonite.

Something has to give.

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FossilDAWG

Despite a superficial resemblance, this is a rudist bivalve not an ammonite.

 

Don

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drbush

it is a rudist

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Creek - Don

My bad! Last picture looked so much like an ammonite.  LOL.

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drbush

Is it durania or Radiolites ?

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abyssunder

Very nice hippuritid rudists! 

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fifbrindacier
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.

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