frankh8147 Posted March 30, 2015 Share Posted March 30, 2015 Recently, I went to a stream in the New Jersey Cretaceous (a tributary of Big Brook) and found something interesting in shell plates. I talked it over with another collector who suggested it might be the internal mold of something like a scaphopod. There are two of them in total on opposite sides of the burrow. Honestly, I have no idea what it is, what do you think? Link to comment Share on other sites More sharing options...
frankh8147 Posted March 30, 2015 Author Share Posted March 30, 2015 More pics.. Link to comment Share on other sites More sharing options...
frankh8147 Posted March 30, 2015 Author Share Posted March 30, 2015 ... Link to comment Share on other sites More sharing options...
frankh8147 Posted March 30, 2015 Author Share Posted March 30, 2015 .. Link to comment Share on other sites More sharing options...
frankh8147 Posted March 30, 2015 Author Share Posted March 30, 2015 ... Link to comment Share on other sites More sharing options...
Al Dente Posted March 30, 2015 Share Posted March 30, 2015 I think they are some type of tubeworm. Link to comment Share on other sites More sharing options...
Carl Posted March 30, 2015 Share Posted March 30, 2015 The curved piece I think is a steinkern of Hamulus, a worm tube as Al Dente says. But the cylinder with the tuberculated surface is Ophiomorpha, a ghost shrimp burrow. 1 Link to comment Share on other sites More sharing options...
Auspex Posted March 30, 2015 Share Posted March 30, 2015 The curved piece I think is a steinkern of Hamulus... I would not have recognized it as such, lacking the fluting. I does seem way too curved to be a scaphopod (which was my early conjecture). "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Herb Posted March 30, 2015 Share Posted March 30, 2015 internal cast of a spiney oyster spine? Seems to me also that it is too curved to be a scaphopod. "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
PFOOLEY Posted March 30, 2015 Share Posted March 30, 2015 Might it be a cephalopod hook? "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...
Auspex Posted March 30, 2015 Share Posted March 30, 2015 This image doesn't show it well, but there appears to be a thin steinkern-like void around the 'hook', as if shell material has dissolved away. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Auspex Posted March 30, 2015 Share Posted March 30, 2015 This image doesn't show it well, but there appears to be a thin steinkern-like void around the 'hook', as if shell material has dissolved away. To whit: "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
LanceH Posted March 30, 2015 Share Posted March 30, 2015 Maybe scaphopod. Link to comment Share on other sites More sharing options...
frankh8147 Posted March 31, 2015 Author Share Posted March 31, 2015 Thanks for the help so far! Let me know if additional pictures of different angles would help. Link to comment Share on other sites More sharing options...
Carl Posted March 31, 2015 Share Posted March 31, 2015 We can probably rule out scaphopod because of the very strong curve. And we can rule out cephalopod hook because of the size and the preservation: a hook would be expected to be a phosphatized original rather than a sediment steinkern. Plus, as Auspex points out, you can make out the shell void. And finally, Hamulus is known from these deposits. 1 Link to comment Share on other sites More sharing options...
non-remanié Posted March 31, 2015 Share Posted March 31, 2015 Well, I do have a couple Scaphopods from the Wenonah as well, but I agree with Hamulus for this one. We can probably rule out scaphopod because of the very strong curve. And we can rule out cephalopod hook because of the size and the preservation: a hook would be expected to be a phosphatized original rather than a sediment steinkern. Plus, as Auspex points out, you can make out the shell void. And finally, Hamulus is known from these deposits. 1 ---Wie Wasser schleift den Stein, wir steigen und fallen--- Link to comment Share on other sites More sharing options...
frankh8147 Posted April 1, 2015 Author Share Posted April 1, 2015 The curved piece I think is a steinkern of Hamulus, a worm tube as Al Dente says. But the cylinder with the tuberculated surface is Ophiomorpha, a ghost shrimp burrow. http://www.thefossilforum.com/index.php?/topic/51376-fossil-in-dallas/ Thanks! That looks good to me! Link to comment Share on other sites More sharing options...
The Jersey Devil Posted May 29, 2019 Share Posted May 29, 2019 (edited) @Carl @non-remanié Can Hamulus worm tubes either be smooth or have ridges depending on the species? The pics I’ve seen online all have the ridges on them. Edit: Just realized the ones in this thread are steinkerns. Does that then mean that Hamulus worms had a hard outer shell? Edited May 29, 2019 by The Jersey Devil “You must take your opponent into a deep dark forest where 2+2=5, and the path leading out is only wide enough for one.” ― Mikhail Tal Link to comment Share on other sites More sharing options...
hemipristis Posted May 30, 2019 Share Posted May 30, 2019 On 3/31/2015 at 4:16 AM, frankh8147 said: ... This has the appearance of a burrow. Each little bump represents a mouthful of mud. A larger version, from a burrowing shrimp Callionassa sp. below 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
Al Dente Posted May 30, 2019 Share Posted May 30, 2019 11 hours ago, The Jersey Devil said: @Carl @non-remanié Can Hamulus worm tubes either be smooth or have ridges depending on the species? The pics I’ve seen online all have the ridges on them. Edit: Just realized the ones in this thread are steinkerns. Does that then mean that Hamulus worms had a hard outer shell? Hamulus had calcitic tubes. The ones I find in the Peedee Formation have the typical ridged shell but these shells can break apart revealing an inner smooth tube that are frequently found whole. 2 Link to comment Share on other sites More sharing options...
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