drbush Posted November 20, 2018 Share Posted November 20, 2018 Dear friends can you help me with this? I went last week end to Rmah city ,the area is Cretaceous, Aruma Formation.the fossil was a surface find (tooth like.) is 6 cm long and 3.5 cm wide, what could it be ? Link to comment Share on other sites More sharing options...
Manticocerasman Posted November 20, 2018 Share Posted November 20, 2018 looks like a rudist to me growing old is mandatory but growing up is optional. Link to comment Share on other sites More sharing options...
drbush Posted November 20, 2018 Author Share Posted November 20, 2018 there wasn’t any colons or reef like structures , it was a surface find Link to comment Share on other sites More sharing options...
Manticocerasman Posted November 20, 2018 Share Posted November 20, 2018 an other possibility is Pinna sp. a bivalve. 2 growing old is mandatory but growing up is optional. Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 20, 2018 Share Posted November 20, 2018 Not a tooth, as there is no enamel or bone/root textures. Looks like a bivalve steinkern to me. 2 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
PFOOLEY Posted November 20, 2018 Share Posted November 20, 2018 2 hours ago, Manticocerasman said: ...Pinna sp. a bivalve. Agreed. "I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?" ~Aldo Leopold (1887-1948) New Mexico Museum of Natural History Bulletins Link to comment Share on other sites More sharing options...
Max-fossils Posted November 20, 2018 Share Posted November 20, 2018 3 hours ago, Manticocerasman said: an other possibility is Pinna sp. a bivalve. Do you have any similar specimens to compare? I find that the specimen in the OP is surprisingly round for a Pinna shell... 3 hours ago, drbush said: there wasn’t any colons or reef like structures , it was a surface find I don't think that this necessarily rules out rudists. Sometimes a single specimen could be found separated from the rest of the reef (by ocean currents or something like that). I don't know enough about rudists to know whether that is possible or not, but it does seem like a rather logical explanation to me. Plus, I think @FranzBernhard has more than once found amazing rudist fossils that weren't in their home reef anymore. For now I'm in the rudist camp... 1 Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
FranzBernhard Posted November 20, 2018 Share Posted November 20, 2018 Thats a difficult one! Looks somewhat like a rudist steinkern, the groove could be the imprint of a pillar, perhaps the L-pillar, so it could be a radiolitid steinkern. But I am not sure, the view from above is somewhat strange for a rudist. Some kind of Pinna? Could be, they can have weird shapes. For example, the Caenozoic Pinna tetragona has a rhombic cross section. Is this groove on both sides of the steinkerns (I don´t think so, judging from one of the figures)? Yes, there is no reef structure necessary to have some rudists. Some rudists like it to be colonial and build some kinds of reef-like structures (which can be broken up later on), some like it to be solitary. Franz Bernhard 3 Link to comment Share on other sites More sharing options...
Pemphix Posted November 20, 2018 Share Posted November 20, 2018 You may have a look here: https://www.researchgate.net/publication/324596635_Solitary_corals_of_the_Campanian_Hajajah_Limestone_Member_Aruma_Formation_Central_Saudi_Arabia https://www.researchgate.net/publication/272198664_Gastropods_from_the_Campanian-Maastrichtian_Aruma_Formation_Central_Saudi_Arabia 1 Link to comment Share on other sites More sharing options...
PFOOLEY Posted November 20, 2018 Share Posted November 20, 2018 My first thought was Pinna sp. They are very worn and incomplete (which may be why they seem more "round" than you would expect) but the pseudoligament (groove) is what gives it away (for me anyway ). Here is a sample of the Turonian Pinna... ...local to my stomping grounds. 3 "I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?" ~Aldo Leopold (1887-1948) New Mexico Museum of Natural History Bulletins Link to comment Share on other sites More sharing options...
abyssunder Posted November 21, 2018 Share Posted November 21, 2018 All the specimens in question are bivalves. It will be hard to make a distinguishing between a rudist or a Pinnidae considering the actual preservation status. Having the specimens in hand, I could give a quick answer. Unfortunately I'm too far from them. Can we have a photo with those four specimens showing their opposite side? " 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...
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