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Showing results for tags 'concretion'.
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A few weeks ago, my niece and I made a trip to the Straits of Juan de Fuca. I believe we were in the Pysht formation. We cracked several concretions open, but this was the only one I found anything in (my niece found something equally as interesting). We found other neat things that I will post up later. It is about 8mm at the largest exposed portion (see photo). It looks segmented like a shrimp tail, which made me think of the Aturia I've seen from other locations here in Washington. Just a guess, though. Your thoughts would be appreciated. I will continue the prep on this, after I get the Microjack.
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I need some help with a pit 11 unknown. Reminders me oy a “Y” but it has bulbous ends on the appendages. Any thoughts? Pat
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I would like to know whether or not this is a concretion? What is in the center? It is a middle Tennessee creek find.
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Is this possibly a small clam steinkern or just an ordinary concretion? Or maybe a tiny, ancient UFO? 4.5 cm wide x 3.5 cm deep x 2 cm thick. Some of the openings go in a ways, pic 2, left side goes in about a 1/4 inch, same with left opening in pic 3. Pic 2 just looks like some 1950's movie UFO.
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Hello, I found this in a creek in middle Tennessee. Is it a concretion or some type of fossil?
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I would like to know if this is a concretion or some type of fossil? It is from a creek in middle Tennessee. Thanks!
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Concretion fish from Jiangsu
Crazyhen posted a topic in Is It Real? How to Recognize Fossil Fabrications
This fish is 14cm long from Jiangsu. Any idea what species it is?
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Hello! I am hoping someone can tell me exactly what this is? It was found in a creek in middle Tennessee. I am assuming it is a concretion of some sort, but the inside looks different from others I’ve seen.
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I assumed this item was a concretion. I regularly find fist-sized concretions in the Argentine member of the Kansas City group (Pennsylvanian subsystem). But looking this morning at a comment by @WhodamanHD here I wondered whether what I have is a sponge. The specimen is about 6 inches across and 4.5 inches from top to bottom. What do you think?
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I think the answer to what inspired this concretion became obvious in the photo that I included for context. I figured it might make a good example if this checks out. The crinoid columnal mold at its very edge indicates that the shapes were most likely more pieces of crinoid that left only ghosts ?
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I was out hunting near Spring Valley, Minnesota with @Bev and @minnbuckeye the last couple of days. As always, I was looking for coprolites. Mike came across this first piece, sitting loose in a piece of weathered matrix. While we were splitting rocks, we found a virgin layer of the source matrix. When we got back to Bev's fossil barn (everyone should have one), I took a peak under the microscope at two of the loose, irregular objects but couldn't really see much because of the powdery iron oxide coating. When I lightly rinsed them, they revealed these microscopic (calcareous) jack-shaped objects. Similar inclusions were in both objects loose objects. You can see from the broken spine on the inclusion in the lower right that they are hollow. In the other loose piece and those still embedded in the matrix, I can also see random straw-like spines of the same material. I'm not sure if these are coprolites, algal masses or something else. I have seen coprolites covered in powdery iron oxide before. Eventually I would like to free more of these from the matrix so that I can sacrifice one to get a look at the interior. Can anyone identify the little jack-shaped inclusions? The spines may have been quite a bit longer. The only things I can think of are forams or perhaps diatoms. Bev and Mike - What was the name of that cliff again? Decorah Shale? @Carl
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These round objects are found in Ganzhou with dinosaur eggs. As far as I understand, they’re not Man-made. They are very round and of the same size. What are they? Eggs or concretion?
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I know this is a concretion, but I think it is so cool looking. It has weathered so differently than almost any other concretion I have ever seen. Most layers of this type of material come off in a lot thicker layers. It is possible that is just how it weathered, but I am wondering if there is more to it than that. The layers are so thin and fine. I found yesterday while out hunting in a new favorite spot in the Britton Formation of the Eagle Ford group in Collin county Texas with Joe AKA @Fruitbat. The area I found it in is full of concretions. Many of them have fossils inside of them, but they’re a dark, brick red. The fossils are generally cepholopods, both ammonite and baculite, Inoceramus clams, other pelecypods and gastropods. This concretion is from a layer above the brick red concretion layer I think. I have concretions from all over. Some are cool colors and shapes and some have fossils inside, like my Mazon fossils and also Carboniferous ones I collected in Oklahoma. Also those that I’ve collected in the North Sulfur River and Britton Formation, but this one is unique it it’s own class. Any thoughts on it would be appreciated. It seems like concretions come up so often we ought to have a concretion section on TFF. Of course most of them come up in the fossil ID section. Anyone know the term for this type of concretion? I assume it formed by repeated thin layers being added on slowly over time, which now are eroding away. Thing is I didn’t find any others like it. I’ve been to the area 3 times in the last week. Why would just one concretion be like that? Side 1 Side 2 One of the long edges. The other is flat and solid looking rock, kind of like the bottom end of this one. End 1 different angle that looks a lot like wood, but must be just cool layering and weathering effects. End 2 the typical layered concretion look.
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Dinosaur egg? concretion?
Crazyhen posted a topic in Is It Real? How to Recognize Fossil Fabrications
This round egg-shaped object was found along with genuine dinosaur eggs at Ganzhou, Jiangxi. It is however bigger in size (diameter 18cm vs 12cm) and is dorso-ventrally depressed. Is it a dinosaur egg or concretion?
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Crinoid or concretion?
Arizona Rex posted a topic in Is It Real? How to Recognize Fossil Fabrications
I found this while digging in my yard, early this morning. Can't say how long it could have possibly been there, I must note the previous owners did have an abundance of river rock brought in for decoration over a decade ago. The piece itself was about 15 inches down. It looked cool on the surface but when I took my loupe to it I found some interesting markings. I don't know if I'm looking at perhaps crinoid stems, plant parts, or an interesting geologic concretion? Thank you for your help.
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New Paper About the Formation of Fossil-Bearing Spherical Carbonate Concretions
Oxytropidoceras posted a topic in Fossil News
Cracking open the formation of fossil concretions Nagoya University, Science Daily, May 2, 2018 https://www.sciencedaily.com/releases/2018/05/180502103931.htm https://www.eurekalert.org/pub_releases/2018-05/nu-cot050218.php The open access paper is at: Yoshida, H., Yamamoto, K., Minami, M., Katsuta, N., Sin-ichi, S. and Metcalfe, R., 2018. Generalized conditions of spherical carbonate concretion formation around decaying organic matter in early diagenesis. Scientific reports, 8(1), article. 6308. https://www.nature.com/articles/s41598-018-24205-5 Yours, Paul H.- 1 reply
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Is this a fossil or just some strange concretion? It's on a paper towel so it's not very big but I forgot to measure it, guessing about 4"
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Many years ago, a friend from Arizona gave me this item. He didn't know what it is but thought it interesting. Memory fails as to exactly where he found it but he lives in northwest Arizona. I came across it in a box recently and would like to know if it is a fossil or not. Forgive the quality of the photos but it's the best I can do with what I have at the moment. I can take better photos later if anyone needs to see better. (I've labelled the three attached photos arbitrarily as top, bottom, and front.) Can anyone identify this item for me? Thanks, Bill
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Hi, I have been finding these round stones and thought that they were small concretions. Then I found one that was more oval in shape, just wanted to get a second opinion. The first picture is of the round one and the second one is the one that really seems out of place. Is this shape normal for concretions, I have seen them on the internet shaped like peanuts. I really don't know a lot about it, just what I have googled in the past few days, any info would be greatly appreciated and fun, thanks so much.
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Hi everyone! This print is found on a concretion--no idea how old, or where it originated from; it was purchased in a specialty shop in Sedona AZ many years ago. It wasn't until just recently I noticed what appears to be a footprint w/4 digits; sharp claws. almost looks like maybe the outer surface might have flowed a bit over the print (?) What do you think? Am I just seeing circus animals in the clouds? I keep trying to upload images that really show the details, but keep getting bumped, even though I'm below the 3.95 MB.
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Mystery here. I found this near home on the banks of the Mississippi River here in east central Iowa. The geology in this area ranges from Ordovician to Pennsylvanian but with lots of glacial erratics and glacial mixing, not to mention the river mixing everything up!! It looks like a fossil concretion kinda like the Mazon Creek ones but is unusually polished, like a celt. Any input would be much appreciated!
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This is a crinoid fossil from Guizhou, it is attached to a gigantic concretion. Do you think there is a fossil inside the concretion? Other than breaking it apart, any other possible way to check if there is a fossil inside the concretion?
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My friend found this big concretion like fossil in Quqing, Yunnan of China. Something on the surface looks like a placoderm to me, what do you think?
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This concretion is found from along with sea lily fossil from the Triassic period on the surface substratum in Guizhou. The surface seems to be of a different texture and colour than the general matrix in the area. Is it simply a concretion or if it is part of a fossil?
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This specimen recently came into my possession with little information. There was a label that said "near Mangyshlak, Kazakhstan". I did some searching and I see nothing like this coming from Kazakhstan. I know there a number of crab experts on this forum so I was wondering if anyone recognizes this specimen. The concretion is like a sandstone. Looks porous. Also, it would not surprise me that the concretion was shaped into a concretions as there are chisel marks on the outside. The matrix looks soft enough to be shaped. However, I can't be sure. Any help is appreciated.
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