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Bryozoan On Inside Of Baculite Living Chamber


Plax

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couldn't decide whether to post this to ID or general discussion. Would be curious to have an ID on this but the interesting thing is its position and growth habit. The bryozoan is growing on the inside of a baculite living chamber. No aragonitic preservation in the Peedee so the shell of the baculite is gone, leaving the bottom of the bryozoan colony exposed. The radial growth is also interesting. Can't say I've ever noticed that before but it may be common. Baculite fragment is 40x25mm. Fossil was found in the loose arenite of the Rocky Point Member of the Peedee Formation, late Cretaceous, Maastrichtian. Pender Co., NC, USA

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What a great fossil!

"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!

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WOW that is a nice one :goodjob:

Discovery consists of seeing what everybody has seen, and thinking what nobody has thought.

Albert Szent-Gyorgyi

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not mine, collected by the Fossil Foilist group :)

It's as smooth as glass which is what lead me to the upside down conclusion. If it had been on the outside of the shell it would have been loose with the aragonite gone. All we would have had was the baculite steinkern. A rare find on its own in the Peedee.

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I'd say after the ammonite was dead. Am assuming the living chamber was tightly filled with the animals body in life. Don't know for sure though. Thanks for looking folks! Not exactly a popular fossil group.

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Very cool. Skylar and his "posse" have found some very awesome interesting and cool fossils recently.

Bulldozers and dirt Bulldozers and dirt
behind the trailer, my desert
Them red clay piles are heaven on earth
I get my rocks off, bulldozers and dirt

Patterson Hood; Drive-By Truckers

 

image.png.0c956e87cee523facebb6947cb34e842.png May 2016  MOTM.png.61350469b02f439fd4d5d77c2c69da85.png.a47e14d65deb3f8b242019b3a81d8160.png.b42a25e3438348310ba19ce6852f50c1.png May 2012 IPFOTM5.png.fb4f2a268e315c58c5980ed865b39e1f.png.1721b8912c45105152ac70b0ae8303c3.png.2b6263683ee32421d97e7fa481bd418a.pngAug 2013, May 2016, Apr 2020 VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png.af5065d0585e85f4accd8b291bf0cc2e.png.72a83362710033c9bdc8510be7454b66.png.9171036128e7f95de57b6a0f03c491da.png Oct 2022

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I have seen a couple examples from the Campanian Wenonah fm. of NJ of bryozoan impressions on Placenticeras minor steinkerns. Very similar. I believe I have also seen it on a baculite but not quite sure of that. It wasn't anywhere as impressive as this specimen if I do recall things correctly. But one of my Placenticeras with bryozoan encrustation is pretty nice. I'll try to post a picture of it here if I have time.

---Wie Wasser schleift den Stein, wir steigen und fallen---

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is that the placenticeras species from the siderite concretions at Big Brook? Have been wondering what to call it. I don't recall any bryozoan on mine but I didn't look at things the same way 20 or 30 years ago.

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Yes, those are P. minor, by far the most common ammonite in the Wenonah formation. My specimen with the bryozoan is from Ramanessin Brook and has phosphatic preservation, though. Still working on a pic... but I'll get to it!

---Wie Wasser schleift den Stein, wir steigen und fallen---

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this guy has an interesting history although im not completely sure of the timeline...

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---Wie Wasser schleift den Stein, wir steigen und fallen---

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those bryozoa look like "outies". Wonder how they stayed in place with the shell gone. Guess the sediment filed the void as the shell dissolved? Is that a burrow structure or the mold of a heteromorph ammonite? Oxybeloceras comes to mind but am away from references. A very interesting specimen all around!

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Yes this piece is a little more interesting than I even had remembered. I'm glad I took it out for another look. I believe it is an uncoiled ammonite mold, and was also thinking Oxybeloceras, but they have never been found in NJ, only in the Mt. Laurel at the C&D Canal. It might also be a part of a Didymoceras perhaps. I guess I could make a positive impression of it and that might help it be IDed, but I think we're on the right track. I guess both of these "guests" must have made it into a dead, empty Placenticeras shell before it was buried and filled with sediment.

---Wie Wasser schleift den Stein, wir steigen und fallen---

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have always liked combo fossils as they provide more entertainment speculating on how they got together, thanks for showing this one!

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  • 5 years later...
On 11/5/2013 at 2:18 PM, non-remanié said:

Yes this piece is a little more interesting than I even had remembered. I'm glad I took it out for another look. I believe it is an uncoiled ammonite mold, and was also thinking Oxybeloceras, but they have never been found in NJ, only in the Mt. Laurel at the C&D Canal. It might also be a part of a Didymoceras perhaps. I guess I could make a positive impression of it and that might help it be IDed, but I think we're on the right track. I guess both of these "guests" must have made it into a dead, empty Placenticeras shell before it was buried and filled with sediment.

 

Does that mean a heteromorph somehow got inside of the Placenticeras shell? That would be strange. Excellent specimen!

“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

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