drbush Posted December 9, 2019 Share Posted December 9, 2019 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? Link to comment Share on other sites More sharing options...
westcoast Posted December 9, 2019 Share Posted December 9, 2019 When I hear the phrase 'strange fossil' my first thought is always 'rudist' which looks like a good fit in your case. 5 Link to comment Share on other sites More sharing options...
TqB Posted December 9, 2019 Share Posted December 9, 2019 I think rudist fragments too. Tarquin Link to comment Share on other sites More sharing options...
fifbrindacier Posted December 9, 2019 Share Posted December 9, 2019 I agree, those are fragments of rudists valves. 1 "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 Link to comment Share on other sites More sharing options...
Manticocerasman Posted December 9, 2019 Share Posted December 9, 2019 +1 for rudist. mabey @FranzBernhard can tel you something more about them. 1 growing old is mandatory but growing up is optional. Link to comment Share on other sites More sharing options...
Rockwood Posted December 9, 2019 Share Posted December 9, 2019 +1 for strange fossil rule 1 Link to comment Share on other sites More sharing options...
Creek - Don Posted December 9, 2019 Share Posted December 9, 2019 Rudists 1 Link to comment Share on other sites More sharing options...
caterpillar Posted December 9, 2019 Share Posted December 9, 2019 Radiolites? 1 http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted December 9, 2019 Share Posted December 9, 2019 Very nice and interesting finds. Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
drbush Posted December 9, 2019 Author Share Posted December 9, 2019 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? Link to comment Share on other sites More sharing options...
JamieLynn Posted December 9, 2019 Share Posted December 9, 2019 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 7 www.fossil-quest.com Link to comment Share on other sites More sharing options...
drbush Posted December 9, 2019 Author Share Posted December 9, 2019 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 ? Link to comment Share on other sites More sharing options...
Creek - Don Posted December 9, 2019 Share Posted December 9, 2019 That is the fossilized shell. They are rarely found intact. 1 Link to comment Share on other sites More sharing options...
FossilDAWG Posted December 9, 2019 Share Posted December 9, 2019 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 3 Link to comment Share on other sites More sharing options...
fifbrindacier Posted December 9, 2019 Share Posted December 9, 2019 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? 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. 3 "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 Link to comment Share on other sites More sharing options...
FranzBernhard Posted December 9, 2019 Share Posted December 9, 2019 @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 1 Link to comment Share on other sites More sharing options...
drbush Posted December 15, 2019 Author Share Posted December 15, 2019 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 . 4 Link to comment Share on other sites More sharing options...
Creek - Don Posted December 15, 2019 Share Posted December 15, 2019 Nice colored ammonite. Oringinally, shell of these ammonites resemble like this. Shiny and glossy. Link to comment Share on other sites More sharing options...
Rockwood Posted December 15, 2019 Share Posted December 15, 2019 13 minutes ago, drbush said: 40cm long 6 minutes ago, Creek - Don said: Nice colored ammonite. Something has to give. Link to comment Share on other sites More sharing options...
FossilDAWG Posted December 15, 2019 Share Posted December 15, 2019 Despite a superficial resemblance, this is a rudist bivalve not an ammonite. Don 2 Link to comment Share on other sites More sharing options...
drbush Posted December 15, 2019 Author Share Posted December 15, 2019 it is a rudist Link to comment Share on other sites More sharing options...
Creek - Don Posted December 15, 2019 Share Posted December 15, 2019 My bad! Last picture looked so much like an ammonite. LOL. Link to comment Share on other sites More sharing options...
drbush Posted December 15, 2019 Author Share Posted December 15, 2019 Is it durania or Radiolites ? Link to comment Share on other sites More sharing options...
abyssunder Posted December 17, 2019 Share Posted December 17, 2019 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 Link to comment Share on other sites More sharing options...
fifbrindacier Posted December 18, 2019 Share Posted December 18, 2019 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 . 15 hours ago, abyssunder said: Very nice hippuritid rudists! Wow, what a nice "monster" ! I agree this is an hippuritid. "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 Link to comment Share on other sites More sharing options...
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