ricardo Posted December 29, 2018 Share Posted December 29, 2018 Dear TFF Friends, I´m lost here. I really appreciate any help you can provide. From Callovian Link to comment Share on other sites More sharing options...
ricardo Posted December 29, 2018 Author Share Posted December 29, 2018 Other sample... Link to comment Share on other sites More sharing options...
ynot Posted December 29, 2018 Share Posted December 29, 2018 Where was it found? Age? My first thought is a rudist, but they are strange critters. Hey @Rockwood what do You think? 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
ricardo Posted December 29, 2018 Author Share Posted December 29, 2018 Ynot, thank you for your help. It is a Callovian regressive sequence. In this level ammonites are scarce and Bivalvia and Brachiopoda are dominants. I believe it is not a rudist. Link to comment Share on other sites More sharing options...
Rockwood Posted December 29, 2018 Share Posted December 29, 2018 1 hour ago, ynot said: what do You think? Very bottom left; it would be nice to get a better sense of the structure at a finer scale in what would be a cross section. It might help to eliminate a normal critter at least. 1 Link to comment Share on other sites More sharing options...
abyssunder Posted December 29, 2018 Share Posted December 29, 2018 Unfortunately, there were no rudists in the late Middle Jurassic. 2 " 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...
ricardo Posted December 29, 2018 Author Share Posted December 29, 2018 2 minutes ago, abyssunder said: Unfortunately, there were no rudists in the late Middle Jurassic. Truly. Thanks. Link to comment Share on other sites More sharing options...
Max-fossils Posted December 29, 2018 Share Posted December 29, 2018 1 hour ago, ricardo said: This looks to me like a crushed and very incomplete bivalve, the structure looks rather consistent. I've found similar-looking specimens of incomplete bivalves. But you'll have to keep it as Bivalvia indet. because this is pretty much un-ID-able, unless you have some really complete litterature that says there's only one or two bivalve species with this type of concentric structure in this formation. I can't help with the second specimen, but it looks pretty interesting to me. That one does not look at all like a bivalve to me, especially considering that rudist isn't an option (as @abyssunder pointed out). 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...
ricardo Posted December 29, 2018 Author Share Posted December 29, 2018 10 minutes ago, Rockwood said: Very bottom left; it would be nice to get a better sense of the structure at a finer scale in what would be a cross section. It might help to eliminate a normal critter at least. I will try more pictures. How you will picture those to see more? Thank you for your interest. Link to comment Share on other sites More sharing options...
TqB Posted December 29, 2018 Share Posted December 29, 2018 Distorted ammonite fragments? The first one looks like bits I've seen 2 Tarquin Link to comment Share on other sites More sharing options...
Max-fossils Posted December 29, 2018 Share Posted December 29, 2018 Just now, TqB said: Distorted ammonite fragments? First or second specimen? 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...
TqB Posted December 29, 2018 Share Posted December 29, 2018 1 minute ago, Max-fossils said: First or second specimen? First, especially - just edited my post. 2 Tarquin Link to comment Share on other sites More sharing options...
Rockwood Posted December 29, 2018 Share Posted December 29, 2018 1 minute ago, ricardo said: I will try more pictures. How you will picture those to see more? Thank you for your interest. First, do you see any structure to photograph ? I'm thinking like invertebrate colony. 1 Link to comment Share on other sites More sharing options...
Max-fossils Posted December 29, 2018 Share Posted December 29, 2018 1 minute ago, TqB said: First, especially - just edited my post. Ah ok. I'll stick with my bivalve opinion for now, but I might change that if proven wrong. 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...
abyssunder Posted December 29, 2018 Share Posted December 29, 2018 I'm wondering if can't be an ammonoid cephalopod fragment? Ah, Tarquin said it already. 2 " 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...
Rockwood Posted December 29, 2018 Share Posted December 29, 2018 I don't think the two are the same thing. 1 Link to comment Share on other sites More sharing options...
abyssunder Posted December 29, 2018 Share Posted December 29, 2018 Here's an older topic of a maybe similar one. 3 " 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...
ricardo Posted December 29, 2018 Author Share Posted December 29, 2018 9 minutes ago, Max-fossils said: This looks to me like a crushed and very incomplete bivalve Thank you Max. It is an option, but when I hammered it (the other fragment was loose) the shape doesn´t match with bivalvia. 5 minutes ago, abyssunder said: Here's an older topic of a maybe similar one. I will see it. Thank you. 13 minutes ago, TqB said: Distorted ammonite fragments? The first one looks like bits I've seen Thank you TqB. That was my first idea but I´m still puzzled. The help from TFF members will make light to me. Probably the answer will be the simple one. 5 minutes ago, Rockwood said: I don't think the two are the same thing. Probably not. I took the first from field because I believed those were the same and will help me in an ID. 13 minutes ago, Rockwood said: First, do you see any structure to photograph ? I'm thinking like invertebrate colony. Thank you Rockwood. I didn´t see any... Link to comment Share on other sites More sharing options...
abyssunder Posted December 29, 2018 Share Posted December 29, 2018 2 " 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...
ricardo Posted December 29, 2018 Author Share Posted December 29, 2018 When I saw the picture. I saw the same... a siphuncle, but under magnification it is just a mark on the rock. Link to comment Share on other sites More sharing options...
Rockwood Posted December 29, 2018 Share Posted December 29, 2018 23 minutes ago, Rockwood said: I don't think the two are the same thing. I think the post abyssunder gave us tends to explain the difference as the inner and outer layers of the shell. It would be a common arrangement in these. 1 Link to comment Share on other sites More sharing options...
ricardo Posted December 29, 2018 Author Share Posted December 29, 2018 This is a bad picture because I have no ligth now. The first sample and two Macrocephalites from the under layers. 1 Link to comment Share on other sites More sharing options...
ricardo Posted December 29, 2018 Author Share Posted December 29, 2018 I would like to thank everyone for their kind input. Ricardo Link to comment Share on other sites More sharing options...
ricardo Posted December 30, 2018 Author Share Posted December 30, 2018 First sample. Link to comment Share on other sites More sharing options...
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