drbush Posted October 20, 2019 Posted October 20, 2019 Hi friends ,can you help me with this ,I went to Aruma formation area (Cretaceous) to the north of Riyadh and found this small fossil , it is thin ,half a circle , 4 mm wide and 4 cm long , it was a surface find . What sp. could it be?
Rockwood Posted October 20, 2019 Posted October 20, 2019 It's a bit unusual, but I think the cretaceous may have seen crinoids with stalks like this.
JamieLynn Posted October 20, 2019 Posted October 20, 2019 I have found cretaceous crinoid stalks (from Texas, not Saudi Arabia) and to me, they don't really look similar. I think this might be the top edge of one of the rudist species, perhaps Radiolites This is cretaceous crinoid Isocrinus 6 www.fossil-quest.com
FranzBernhard Posted October 20, 2019 Posted October 20, 2019 @drbush, how does it look like in side view/cross section? This would be critical observation! Franz Bernhard 1
Mark Kmiecik Posted October 20, 2019 Posted October 20, 2019 I'm seeing irregularities that preclude crinoid stem. I'm in the rudist camp here. Mark. Fossil hunting is easy -- they don't run away when you shoot at them!
drbush Posted October 21, 2019 Author Posted October 21, 2019 The cross section of the stone is thin 3-4 mm, flat layer. I do not have the full length
Rockwood Posted October 21, 2019 Posted October 21, 2019 4 minutes ago, drbush said: The cross section of the stone is thin 3-4 mm, flat layer. I do not have the full length But was the fossil as flat, or has it been sectioned is what we need to know.
Rockwood Posted October 24, 2019 Posted October 24, 2019 5 hours ago, drbush said: flat I think that would tend to favor it being the rim of a rudist seen in sectioned view.
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