Denis Arcand Posted March 18, 2023 Share Posted March 18, 2023 The crinoid columnals i have found are usually round, pentagonal and star shaped, but today I found one that is square Among a thousand crinoids columnals, this is the only square one I have ever found, why? To which part of the crinoid does it belong to? One fossil a day will keep you happy all day. Welcome to the FOSSIL ART Link to comment Share on other sites More sharing options...
Kane Posted March 18, 2023 Share Posted March 18, 2023 Stem. ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
Fossildude19 Posted March 18, 2023 Share Posted March 18, 2023 I don't think it is actually square. I think it was eroded into that shape. 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Denis Arcand Posted March 18, 2023 Author Share Posted March 18, 2023 (edited) 43 minutes ago, Fossildude19 said: I don't think it is actually square. I think it was eroded into that shape. At first that's what I thought, but on closer inspection you realize that there are only 4 spokes instead of 5 in the central part. Edited March 19, 2023 by Denis Arcand One fossil a day will keep you happy all day. Welcome to the FOSSIL ART Link to comment Share on other sites More sharing options...
Mochaccino Posted March 19, 2023 Share Posted March 19, 2023 (edited) Where was it found and what geological age is it? There is an ordovician crinoid genus known as Xenocrinus characterized by its unusual square stem. If you find these 4-sided stems regularly, they could belong to Xenocrinus. Alternatively, this specimen might just be a one-off freak mutant. http://drydredgers.org/crinoids_monobathrida.htm Edited March 19, 2023 by Mochaccino 2 1 Link to comment Share on other sites More sharing options...
BobWill Posted March 19, 2023 Share Posted March 19, 2023 I have some stem sections with 6 lobes. I think they can just have abnormalities like any creature, like a person with 6 fingers. I will look for a drawing I have somewhere showing some odd examples. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted March 19, 2023 Share Posted March 19, 2023 I think that it is a deformity. I sort of see a 5th spoke and 5 sides similar to the disk next to it. Also, the side with the diminutive 5th spoke bows out unlike the other sides that are more straight with a slight dimple. Note the purported 4 sided disk has two nearly opposite sides that are not quite parallel, hinting that it may be a deformed 5 sided disk and not a deformed 4 sided disk. 3 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Denis Arcand Posted March 19, 2023 Author Share Posted March 19, 2023 19 hours ago, Mochaccino said: Where was it found and what geological age is it? There is an ordovician crinoid genus known as Xenocrinus characterized by its unusual square stem. If you find these 4-sided stems regularly, they could belong to Xenocrinus. Alternatively, this specimen might just be a one-off freak mutant. http://drydredgers.org/crinoids_monobathrida.htm To answer your question, it was found in the province of Quebec near Montreal, it dates from the Upper Ordovician period Thanks, that's very informative, I didn't know that some species of crinoids could have a square stem. You even gave the name Xenocrinus, which I can refer to, that's great. If it was Xenocrinus, I would surely have found other square stem 15 hours ago, BobWill said: I have some stem sections with 6 lobes. I think they can just have abnormalities like any creature, like a person with 6 fingers. I will look for a drawing I have somewhere showing some odd examples. It's interesting, I understand that this is not exceptional and has already been seen before. Thanks for your reply 15 hours ago, DPS Ammonite said: I think that it is a deformity. I sort of see a 5th spoke and 5 sides similar to the disk next to it. Also, the side with the diminutive 5th spoke bows out unlike the other sides that are more straight with a slight dimple. 15 hours ago, DPS Ammonite said: Note the purported 4 sided disk has two nearly opposite sides that are not quite parallel, hinting that it may be a deformed 5 sided disk and not a deformed 4 sided disk. You have a good eye for detail despite the poor quality of the picture. I'm looking at the original, and it's exactly as you say. Thanks Could it be of interest to a paleontologist, as an example of a feek anomaly, if so, I will gladly give it away? One fossil a day will keep you happy all day. Welcome to the FOSSIL ART Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted March 19, 2023 Share Posted March 19, 2023 I agree that this is not a square crinoid ossicle. Xenocrinus looks quite different. Here are some of mine from St. Leon, Indiana 2 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Kane Posted March 19, 2023 Share Posted March 19, 2023 18 minutes ago, Denis Arcand said: Could it be of interest to a paleontologist, as an example of a feek anomaly, if so, I will gladly give it away? You'll want to reach out to Mario at Musée de paléontologie et de l'évolution. They have the largest collection of Quebec fossils anywhere, and Mario is a nice guy. ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
Denis Arcand Posted March 20, 2023 Author Share Posted March 20, 2023 2 hours ago, Kane said: You'll want to reach out to Mario at Musée de paléontologie et de l'évolution. They have the largest collection of Quebec fossils anywhere, and Mario is a nice guy. I was thinking about becoming a member, maybe that's just the incentive I needed Thanks! One fossil a day will keep you happy all day. Welcome to the FOSSIL ART Link to comment Share on other sites More sharing options...
Denis Arcand Posted March 20, 2023 Author Share Posted March 20, 2023 3 hours ago, Tidgy's Dad said: I agree that this is not a square crinoid ossicle. Xenocrinus looks quite different. Thanks for you input @Tidgy's Dad, it's always appreciated 1 One fossil a day will keep you happy all day. Welcome to the FOSSIL ART Link to comment Share on other sites More sharing options...
Mochaccino Posted March 20, 2023 Share Posted March 20, 2023 On 3/19/2023 at 2:37 PM, Denis Arcand said: To answer your question, it was found in the province of Quebec near Montreal, it dates from the Upper Ordovician period Thanks, that's very informative, I didn't know that some species of crinoids could have a square stem. You even gave the name Xenocrinus, which I can refer to, that's great. If it was Xenocrinus, I would surely have found other square stem It's interesting, I understand that this is not exceptional and has already been seen before. Thanks for your reply You have a good eye for detail despite the poor quality of the picture. I'm looking at the original, and it's exactly as you say. Thanks Could it be of interest to a paleontologist, as an example of a feek anomaly, if so, I will gladly give it away? Giving it a closer look, I agree with the others that it's probably not from a species with a naturally 4-sided stem. Even if it was and you had found many of these, I wouldn't have confidence that it's of the genus Xenocrinus, as I don't know if the genus has been described from the locality, and even within the same genus stems can vary depending on species. But at least you know that something like this exists among crinoids. 1 Link to comment Share on other sites More sharing options...
Denis Arcand Posted August 7, 2023 Author Share Posted August 7, 2023 On 3/19/2023 at 5:56 PM, Kane said: You'll want to reach out to Mario at Musée de paléontologie et de l'évolution. They have the largest collection of Quebec fossils anywhere, and Mario is a nice guy. I attempted to reach out to Mario through the "Musée de paléontologie et de l'évolution" website, but unfortunately, I haven't received any response. Do you happen to have a contact that you could private message me? Thanks! One fossil a day will keep you happy all day. Welcome to the FOSSIL ART Link to comment Share on other sites More sharing options...
Kane Posted August 7, 2023 Share Posted August 7, 2023 He is away on vacation. Patience 1 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
Denis Arcand Posted August 7, 2023 Author Share Posted August 7, 2023 18 minutes ago, Kane said: He is away on vacation. Patience Likely indulging in some fossil hunting. One fossil a day will keep you happy all day. Welcome to the FOSSIL ART Link to comment Share on other sites More sharing options...
Kane Posted August 7, 2023 Share Posted August 7, 2023 With his daughter on the sea shore 1 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
BobWill Posted August 9, 2023 Share Posted August 9, 2023 This image shows basal plates rather than stem sections but it illustrates some possible anomalies seen in crinoids. 1 Link to comment Share on other sites More sharing options...
BobWill Posted August 9, 2023 Share Posted August 9, 2023 Here are some stem sections I have found with 6 lobes. 1 Link to comment Share on other sites More sharing options...
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