Lone Hunter Posted February 4, 2022 Share Posted February 4, 2022 I have numerous worm tunnels, casts, an body fossils that are all very similar from Eagle Ford, then I found the one with black squiggles that is very different, is it just the preservation that is different or is it something else? The other one is from Grayson marl which I'm not as familiar with, the rather delicate branching structure has no resemblance to the worm tunnels/fossils I'm used to finding, is it something else or different species of worm perhaps? Link to comment Share on other sites More sharing options...
Rockwood Posted February 4, 2022 Share Posted February 4, 2022 The first one looks a bit like fish poo (coprolite). The second like the scratches seen in some trace fossil. 1 Link to comment Share on other sites More sharing options...
abyssunder Posted February 4, 2022 Share Posted February 4, 2022 (edited) The second may be close to Chondrites intricatus, but it's just a guess. Edited February 4, 2022 by abyssunder 1 " 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...
Ludwigia Posted February 4, 2022 Share Posted February 4, 2022 I agree with Chondrites for the 2nd one at any rate. Not sure about "species" though. Fish poo is a good possibility for #1. 1 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
TqB Posted February 4, 2022 Share Posted February 4, 2022 Or even Lumbricaria for no. 1? Which is perhaps cephalopod coprolite. @GeschWhat 1 1 Tarquin Link to comment Share on other sites More sharing options...
Rockwood Posted February 4, 2022 Share Posted February 4, 2022 I'll just tag @Carl to get his opinion on the poo, too. Link to comment Share on other sites More sharing options...
abyssunder Posted February 4, 2022 Share Posted February 4, 2022 Maybe the first one is a meandering graphoglyptid trace fossil, something in the line of Spirocosmorhaphe/Cosmorhaphe ? 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...
Lone Hunter Posted February 5, 2022 Author Share Posted February 5, 2022 I think @TqB got it, cephalopod/gastropod coprolite. 1 1 Link to comment Share on other sites More sharing options...
abyssunder Posted February 5, 2022 Share Posted February 5, 2022 11 hours ago, Lone Hunter said: I think @TqB got it, cephalopod/gastropod coprolite. Is your specimen flat? How it looks in cross section? Do you know why is it black in color? 1 " 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...
TqB Posted February 5, 2022 Share Posted February 5, 2022 4 hours ago, abyssunder said: Do you know why is it black in color? Cephalopod ink rather than coprolite has been suggested for some black occurrences like this. I don't know what it is - my suggestion was just a suggestion. 1 Tarquin Link to comment Share on other sites More sharing options...
Lone Hunter Posted February 5, 2022 Author Share Posted February 5, 2022 7 hours ago, abyssunder said: Is your specimen flat? Yes it is flat, but the edges stick up a little, almost looks deflated is best way to describe it. Here's a better image. Link to comment Share on other sites More sharing options...
abyssunder Posted February 6, 2022 Share Posted February 6, 2022 18 hours ago, Lone Hunter said: Yes it is flat, but the edges stick up a little, almost looks deflated is best way to describe it. Here's a better image. Is it one continuous string which is fragmented or there are more strings? The specimen is very flat. Thank you for the pictures. " 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...
JohnJ Posted February 6, 2022 Share Posted February 6, 2022 I suspect this was at one time pyritized and has degraded to a less stable iron based film. 1 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Rockwood Posted February 6, 2022 Share Posted February 6, 2022 32 minutes ago, JohnJ said: I suspect this was at one time pyritized and has degraded to a less stable iron based film. Would help toward coprolite ID ? Link to comment Share on other sites More sharing options...
JohnJ Posted February 6, 2022 Share Posted February 6, 2022 Just now, Rockwood said: Would help toward coprolite ID ? Not necessarily. It could be a number of things from a trace fossil to poo. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Lone Hunter Posted February 7, 2022 Author Share Posted February 7, 2022 7 hours ago, abyssunder said: Is it one continuous string which is fragmented or there are more strings? It appears to be several strings that have fragmented, which snail and fish poo both do. I'm wondering why, if this is coprolite of some kind, it isn't seen more often ? Link to comment Share on other sites More sharing options...
Plax Posted February 7, 2022 Share Posted February 7, 2022 It would be interesting to see if the dark colored objects proceed into the rock. Perhaps we are looking at edges of something. Link to comment Share on other sites More sharing options...
Lone Hunter Posted February 7, 2022 Author Share Posted February 7, 2022 I wondered the same thing, I was able to scrape some off with a knife and it's only on the surface. 1 Link to comment Share on other sites More sharing options...
abyssunder Posted February 7, 2022 Share Posted February 7, 2022 (edited) It looks like the specimen continues under a covering layer of sediment. Lumbricaria, with the known ichnospecies, has a long, sinuous one string shape with a circular transverse section. Sometimes there could be a manganese growth/cover on them, but rarely (if I look to the Solnhofen specimens I have in my collection). Also, they (in my collection) are not so flat like the specimen in question and are not black in color (sometimes are gray). In my opinion, the specimen here is not Lumbricaria ( L. Intestinum, L. colon). It could be flat because of a diagenetic compaction and could be black due to a phosphatic content like the Oligocene teleost fish coprolites from the Menilite Formation of Poland. In my thinking, I would lean toward fish coprolites, but I could be wrong. Btw, Lumbricaria contains saccocomid remains. Edited February 8, 2022 by abyssunder 1 " 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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