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Found 15 results

  1. Hi everyone, I'd like to know your opinion on an item I found during a trip to a former (since turned into a museum) coal mine in Belgium, near the Liège (Luik) area. The coal that was mined there was created during the Westphalian. Massive amounts of waste from the mine were dumped out near it and fossils can be found there. Among this rubble I found an item that I suspect to be an imprint from a plant or tree but it could also be a pseudofossil as I have no idea how to properly id it. Any help on getting an id would be greatly appreciated! To be clear: the units on the ruler are millimeters and not centimeters. For this next image I held the item at an angle to get better lightning so the grooves are more clearly visible: Finally, the last image is the underside of the item, which is how must of the usual rubble at the mine looks: Thanks in advance!
  2. Oxytropidoceras

    Is Brooksella Even a Fossil?

    This Strange Ancient 'Fossil' May Not Have Been Left by Any Living Thing Carly Cassella, ScienceAlert, Nature, February 25, 2023 The open access paper is: Nolan, M.R., Walker, S.E., Selly, T., and Schiffbauer, J. 2023, Is the middle Cambrian Brooksella a hexactinellid sponge, trace fossil or pseudofossil? Peer J. Yours, Paul H.
  3. Here is a great video from a geologist that explains how purported giant tree fossils form. Reminds me of what we try to do on the Forum: using geological principles and logic to determine if a rock is a fossil. Debunking purported fossils seem to be a Sisyphean task around here.
  4. painshill

    Igneous Fossil?

    Igneous fossils? Yes… I know! Bear with me here. Welcome anyone’s views on this item. It belongs to a friend of mine and she’s in the States, so I haven’t been able to personally examine it (I’m in the UK). She thought might be a trilobite. Apart from the odd shape, I see heat shrinkage cracks, black glassy or crystalline material in the cracks and the typical colours of basalt weathering. So, my initial reaction was that its basaltic lava… probably pillow lava from rapid cooling as a result of molten rock meeting water. Igneous tells me it can't be a fossil so it has to be just an odd, weathered shape. The pseudo-fossil form seems to be actually a continuous part of the rock itself. This was from the Licking River region of Ohio, where my friend is finding other pseudo-fossil shapes of highly weathered basalts, but nothing quite as weird as this. Also fossilised corals (in limestone) from the Lower Devonian or Silurian. Fossils as we know them don’t generally occur in igneous rocks, apart from occasionally in volcanic tuffs… like the late Miocene petrified trees from the Yakima basalts of Southern Washington. But volcanic tuff is more or less sedimentary. It occurred to me later that there are exceptions. Igneous fossils of sorts… or moulds and casts at least... can arise from molten lava meeting something organic. Like those found in Hawaii (and also the Galapagos): http://lovingthebigisland.wordpress.com/2009/08/24/hawaiis-amazing-lava-fossils/ Fish cast in basaltic lava from Hawaii: Penguin & seal pups enrobed in basaltic lava from St. Barthalome Island, Galapagos: These are all recent… within the last 2,000 years and sometimes within the last 10 years… but surely there is no reason why ancient examples could not also exist? Most of Ohio's basalt is from the Middle Run Formation and truly ancient (ie pre anything that could be organic), but there have been volcanic intrusions in the Ordovician and again in the Devonian. So, is this just a very odd pseudo-fossil or could it conceivably be an organic cast? The morphology looks wrong for trilobite, but is there anything else that it could be? Roger
  5. Fischcrazy

    Trace fossil or diagenetic feature?

    Found this while splitting some black shale (Millbo ro Shale, Devonian) open, unsure if it is a trace or just a diagenetic feature.
  6. A friend likes to pick up rocks and other assorted things at estate sales. Then he brings them to me for ID. But this one is not in my areas of expertise. It seems like I've seen these for sale at rock shops, not sure. And, I'm not certain it isn't some kind of nodule or pseudo-fossil. The matrix is sandstone, with rusty iron color when scratched with fingernail. Also, because it was purchased, its natural location is unknown. il.
  7. Jcnw

    Pseudo fossil or egg?

    Hi all, see pictures below, i’m jn doubt if this is an egg or just geological. found in The Netherlands Holland, in mining area. thank you
  8. SarahtheIchthyornis

    A worm or worm burrow in New Jersey?

    Hi everyone! I recently found this strange curled relief on a rock in Monmouth County NJ, due to the prevalence of burrows at this site, my guess is that this curl could be a worm (unlikely due to the whole soft tissue thing) or a worm burrow, or perhaps one of the tricks bog iron likes to play. Anyone got any ideas?
  9. Mahnmut

    Geological?

    Hello together, Something I quite often see in the ID-section are pseudofossils commented as "geological/rock". I dont want to be nitpicking, probably it´s just short for "purely geological". Simply "geological" doesn´t seem opposed to fossil, in my understanding fossils do happen at the interesection between geology and biology. So "no biologic structure"=no fossil (except chemical fossils) , but "geological" seems to apply to all the specimens (if they are not molten plastic, recent bone, or something else entirely. ) English is not my native tongue as you may have noticed, but in my understanding fossils are also rocks, at least some kinds, for example steinkern preservation, (rocks with) impressions... So it may be confusing especially for the newbies that often ask about pseudofossils if "geology" stands as the opposite of fossil. What do you think? Best Regards, J
  10. I found a drainage ravine with thousands of these these in them. I'm almost certain they're an iron concretion of some type but I've gotten several different identifications. I took a few of them to the MAPS expo last spring for an ID. One person said michelinoceras, but then an expert on cephalopods said no, definitely not, but he had also never seen anything like them. These were found on the north side of Dubuque, IA right at the top of the lower Galena dolomite just above the upper chert beds. They are in a thick sticky grey clay which sits just above a thick iron rich encrusted layer that varies from 1/4 to 1/2 inch thick (blackend hardground?). The clay layer is approximately 20' thick and contains thousands of these. They are almost all vertically oriented, cylindrical in shape, and vary from 1/2 inch to as much as 6 inches in diameter, and vary in length from several inches to several feet long. Some of the smaller ones that have weathered out do look amazingly like cephalopods. I had previously found a few pinky finger sized weathered ones farther down the ravine and thought cephalopod but then found the clay with the bigger ones. They have a center that resembles a siphuncle but I don't see anything that looks like septa or individual chambers. There are too many of these to think they haven't been found before but I can't seem to find anything describes them specifically for this area. I did find a paper from a study done in Finland titled "Ferruginous Concretions Around Root Channels and Fine Sand Deposits". That paper seems to describe what these may be be but since I've gotten a couple different ID's and none of them concretion I was hoping someone with a little more knowledge can tell me for sure. url to the research paper - https://doi.org/10.17741/bgsf/47.1-2.020
  11. Sylvana Jadir

    Is this a fossil?

    Hi folks, I found this on Killiney Beach in Dublin, Ireland. I usually find fossiliferous limestone there full of crinoids and corals and other fragments. This caught my eye but I have no idea what it is. Any thoughts anyone? Sorry for the use of a 1 pence coin as a scale here, I just saw that using coins is not ideal but I am back in Ireland and the piece is at my home in London where I took the photos. Sylvana
  12. Alex Gu

    Is it fossil or just a rock?

    Yesterday I bought a fossil box from the local natural history museum, just for the sea urchin inside. And there is a mysterious thing inside that looks like fossil but I've never seen something like this. Maybe it's just a weird looking rock?
  13. For those interested in Ediacaran fossils, you may have seen a lot of supposed medusoids coming out of sandstones/quartzites in Namibia. They are usually labeled as unidentified medusoids, but sometimes as the enigmatic genus Namacalathus to command a higher price. At first glance, some specimens do bear resemblance to a top-down cross section of Namacalathus (such as the specimen below), however note that Namacalathus are preserved as calcite skeletons, not as molds in sandstone. A thread discussing these was posted several years ago, without a definitive conclusion. As far as I can find, there have been no published articles on these so called fossils, and perhaps rightly so. After a recent trip to the Field Museum, I am fairly confident that all of these specimens are simply the result of weathering in sandstone. Here is the specimen at the Field Museum that piqued my interest. A quick scan of our favorite auction site will reveal a number of nearly identical specimens listed as medusoid fossils. These holes are likely what are known as tafoni, defined by Wikipedia as "small (less than 1 cm (0.39 in)) to large (greater than 1 meter (3.3 ft)) cave-like features that develop in either natural or manmade, vertical to steeply sloping, exposures of granular rock (i.e., granite, sandstone) with smooth concave walls, and often round rims and openings." They have various methods of formation, but the more "Namacalathus"-looking specimens look (at least to me) to be the result of iron nodules rusting out. They may also be several tafoni that overlapped. Here is an image of tafoni in sandstone from Namibia. (image credit Wikipedia) Regardless of the exact process of formation, I am confident in saying that these are not fossils. There are plenty of other Ediacaran fossils out there for purchase, and given the high price tag these pseudofossils seem to command, I hope this post helps collectors avoid wasting money.
  14. lovec

    Fossil or pseudofossil ?

    Hallo forum, this was in the craggy field where the sea was once decomposing on the limestone subsoil. It reminds me of Hibolites hastatus. What is your opinion ?
  15. Limonite is a type of iron-rich mineral found in igneous formations. It was once used as a source of iron ore and in Delaware was mined for the purpose for two centuries. Limonite tends to form with vugs of easily-weathered minerals, including druse quartz, which leave behind gaping holes and slots. It is easy to picture skulls and other bones in these rocks, whether freshly fractured or stream-worn. This one always reminded me of a dragon skull.
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