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I am fortunate enough to have such a huge amount of Middle Devonian Givetian material that I thought it best to put the older Middle Devonian stage, the Eifelian, in its own thread. There are some spectacular fossils here as well though! I thought a good place to start would be in the Formosa Reef, which I believe is quite early Eifelian. This tabulate coral and stromatoporoid reef continues similar complexes found from the Middle Silurian, see my: https://www.thefossilforum.com/topic/84678-adams-silurian/page/3/ thread from page three onwards for details. All these Formosa Reef specimens come from a delightful gift from my good friend @Monica who is a tad busy with life at the moment but is fine and still thinking of the forum. This outcrop can be found on Route 12 near Formosa/Amherstburg, Bruce County, Ontario, Canada. This beautiful-looking specimen came to me with only a third of it revealed but I managed to get it this far after nine days of painful pin prepping. Monica found another one and posted it for ID here: https://www.thefossilforum.com/topic/105528-weird-circular-imprints-formosa-reef-lower-devonian/#comment-1172285 The specimen was identified by another Canny Canadian @Kane to be the little stromatoporoid sponge Syringostroma cylindricum. Hardly a reef-builder, but gorgeous nonetheless. It does have a little thickness to it, but not much. Beautiful! Pretty thin, actually. I love this Monica, thank you!
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After many fossil hunts at Seven Stars, I finally found a large, prone, almost complete Dipleura dekayi! However, the way the shale split when I chiseled it open, all of the body fossil except the pygidium and a few adjacent segments are on one rock, visible ventrally , but with a thin covering of rock, and the imprint of this covering on the other rock. My original idea was to glue it all back together with field consolidant, then use my dremel tips to prep all the way through the one rock to reveal the trilobite dorsally. However, I am a beginner preparator, and have no assurance (I understand that one can never have assurance that preparation will go well) that everything will work out well, and also the cool textured doublure and the associated hypostome fragment would never be able to be seen again, covered by the rest of the cephalon. Another solution is simply to prep it ventrally, which was not what i was originally what I was going for. Is it possible to prep the cephalon off so that it is removable, so that the underside of it can be visible? Are there any suggestions from seasoned preparators about how I should go about preparing this Dipleura dekayi, which is undoubtedly one of the best specimens in my collection? Thanks for any help in advance; if no clear-cut ideas are given, I may not do anything to it just yet. The main rock, with the impression and the posterior segments: The smaller rock that come off, with the ventrally preserved anterior body with some rock covering it. A 20x magnified view of the doublure and hypostome, showing the striated texture similar to that of unrelated trilobites such as Isotelus, which have been suggested to have been for grading prey on.
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From the album: Kinzers Formation
Wanneria walcottana hypostome Lancaster County, Pennsylvania -
Hi all, I have this beautiful trilobite and was wondering if it would be a good candidate for prepping further. Information I have on this is Flexicalymene from Orab, Ohio. My questions are: Would you think baking soda at a low PSI from a handheld air eraser (thinking of buying a Paasche) would clean this up nicely and give that shiny, "wet" look? I recently saw a photo of a similar specimen where the person who prepped it exposed the hypostome. Would you think that is a possibility here? I am unsure if hypostomes always preserve - though the trilobite looks like it may have it (see photo)
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Hey it’s broken record Brian to ask about yet another hypostome. Needmore formation of WV, Devonian. 10mm x 8mm. I even consulted the chart that @piranha was kind enough to provide me with last time but I’m clearly still developing an eye for hypostome detail. Pictured are both the internal and external molds. Ignore the partial goniatite above it (or enjoy its lovely suture lines, who am I to tell you what to do?) As always thanks for your time!
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While cleaning some fossils this week, I came across this large hypostome. Its size would lean me towards Isotelus, but it just doesn't look right. Is it a different species?? Did anyone notice the SMALL hypostome on top of the large one? Any thoughts on it? Thanks for looking. It was found in the Platteville, Ordovician of SW Wisconsin.
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Hey sorry to bug everyone again so soon but I wound up having time for an outing today to my usual site and found this trilobite hypostome. Needmore formation, Devonian (emsian-eifelian) in WV. When I discovered a new species out here, the only two parts I couldn’t get a good representation of were the hypostome and the eye (found many eyes but they’re always crushed, must be a very thin/delicate structure). So I’m always on the lookout for both, but I have no knowledge at all of whose hypostome looks like what. I feel like if I can narrow down the list a little it’ll make it easier (for instance, I’m guessing this doesn’t belong to N. simoni but something like E. rana). But this also brings me to another question, does anyone know of a good resource for image searching trilobite parts? Like I feel Google has become next to unusable over the years for stuff like this. When I search for something as basic as “Eldredgeops rana hypostome” I get literally nothing for pictures, one small page of bad results and that’s it. Which just can’t be true! On the whole internet you’re telling me no one has uploaded an image of an Eldredgeops hypostome? And it’s not just this, nearly every trilobite or just marine paleo search I do comes back with very very few results. Frustrating. Hate having to bug everyone here for something that I assume is going to be a pretty simple ID. Especially for something that I very easily ought to be able to do for myself, given the proper resources. But as always, thank you for your time!
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OK, on my few trips to the Latham Shale in the Marble Mountains of Southern California I have found a few things that I'm just not sure of. I will include any info before each photo. Scale: little marks are 2mm, bigger numbered marks are cm 1: Ok, first I will include 2 photos of what I question as maybe trilobite hypostome. I haven't found any good illustrations of Olenellus hypostome. I've found probably 10 of these. They all look the same shape though many different sizes. 2: Next, I find a few of these each day. The cephalons from the trilobite species of this age tend to stay in one piece but this reminds me of the anterior lobe of a glabella. I have no other idea. It is round and inflated (about 4mm high) and will pop off the matrix. 3: This one I can't nail down at all. Is it a worm or what???? 4: This is a ? Looks kind of tooth-ish but I have no idea. I might try to get better photos when I find it again (still packed from my flights and driving) That is it. I've found at least a few of each of these except number 3. Thank you for your time and help.
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From the album: Fossildude's Middle Devonian Fossils
Greenops sp. Middle Devonian, Hamilton Group, Upper Ludlowville Formation . Geer Road Quarry, Lebanon, NY.© 2021 Tim Jones
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From the album: Fossildude's Purchased/Gift Fossils
Before and after prep. Still needs a bit more... This was a gift from my good friend, JimB88. Thanks Jim!© © 2013 Tim Jones
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From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation
Ceraurid hypostome. Platteville Formation (SW corner specimen) and rest are Decorah Formation. For a long time I thought it was little rolled up trilobites, that's how much the hypostome look like. Tiny .5 cm for Decorah ones and .6 cm for platteville ones. Decorah ones seem to be uncommon to common and very easily overlooked because of its tiny size. Heck I wonder how many had I overlooked over 5 years. -
Hello, my friends, tis I once more with queries regarding odds and ends found in matrix from Southgate Hill road cutting, St. Leon, Indiana. Late Ordovician from the Upper Arnheim, Waynesville, Liberty and Lower Whitewater formations. Is this first one a bit of free cheek with a spine base? The piece is 1.5 mm wide and the big brachiopod bottom left is the edge of a Strophomena planumbona. I am pretty certain that this next one is a hypostome. It looks like some of the Isotelus ones I have seen but is very small. 2.5 mm. A small Isotelus? Another trilo? Or the Millennium Falcon? I think this is another hypostome. But of what? It's actually in the same rock as the one above but is a little bigger at 3 mm from tip to tip. Closer look : This one's enormous by comparison, 1.9 cm from curve to tip. But I'm not sure it is a hypostome. It sort of looks like part of the internal structure of a brachiopod or bivalve but I can't for the life of me think what. Especially at this size. Close up : Are these ostracods? Quite a lot of them in this rock, 0.5 to about 1 mm wide : @connorp @erose @Kane @piranha @ClearLake And all comments welcome from anyone else. Thank you all very much for any assistance.
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I am looking at some rocks already collected from and am going back to the Latham shale location in the southern California desert and wondering if anyone knows of a photograph or good drawing of the hypostome from Olenellus / Mesonacis / Bristolia trilobites? Would hate to toss a rock only to figure out later what was on it Have looked a bit but im traveling so only have my phone and going through a bunch of PDFs is a pain! Thanks for any ideas! @Kane @piranha?
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Hello everyone! So I was cleaning off a rock today and on it I found this tiny hypostome. I was wondering if anybody has an idea of what species this may have come from. This rock came from a site in North-Central NY that exposes the Ordovician Trenton Group. Thanks for looking!
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Acanthopyge contusa hypostome to the ROM
Monica posted a topic in Partners in Paleontology - Member Contributions to Science
Hello everyone! I wanted to share some good news with you all... On Monday, March 16, 2020, I visited "Formosa Reef" in Ontario (Amherstburg Formation, Lower Devonian) for a little fossil hunt. One of the rocks that I found at the site had a trilobite piece that @piranha identified as the hypostome belonging to the trilobite Acanthopyge contusa. When I asked him if he knew of any museum/researcher who might be interested in my specimen, he suggested that I contact the Royal Ontario Museum (ROM), and so I did. First, I emailed David Rudkin, and this is what he said: "Thank you very much for getting in touch and offering to donate your splendid little Acanthopyge hypostome! I've been retired from the ROM for 3 years now and am not permitted to act on behalf of the Invertebrate Palaeontology section, but I am copying these messages to the Curator and Collection Manager with my recommendation to accept your generous offer." "Acanthopyge contusa is indeed a relatively rare component of the Formosa trilobite fauna and the ROM collections do not hold any specimens of the elusive hypostome. Like your contact on The Fossil Forum I've not seen one from Ontario before, so your discovery is quite exciting ... at least for a self-professed trilobite geek such as myself! I'm hoping that my ROM colleagues, Dr Caron and Ms Akrami, will follow my recommendation to accept your offer, but I must leave the final decision in their hands." Just last night, I received two consecutive emails from Maryam Akrami (the current Invertebrate Paleontology Collections Manager at the ROM): "Thank you for sending the images and the information for the trilobite specimen. I am glad to let you know that we will accept your offer of donation. Just want to let you know that the ROM is closed until at least 5th April. If you would like to ship the specimen to us now, I can give you my home address. Once we have the specimen, I will send you a letter acknowledging your generous donation to the ROM." "Following up on my previous email (below), given the current situation and the advise against leaving our homes for non-essential reasons, perhaps it would be a good idea to wait till things return to normal and then ship the specimen to us. I hope that would be ok with yourself." So, once the ROM is up and running again, I'll be handing over my little Acanthopyge contusa hypostome to the ROM! I'll update this thread as soon as the donation has been completed. Here are pictures of the specimen in question: Thanks for reading, everyone! Monica- 49 replies
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Hello, my friends. This specimen comes from a wonderful hash plate, maybe my favourite hash, that was kindly sent to me by Ralph, @Nimravis It's from the Southgate Hill Road Cut, St.Leon, Indiana, USA and is Cincinnatian (Late Ordovician) in age, probably the Waynesville Formation, judging by the brachiopod assemblage. But could be Liberty. Is this a trilobite hypostome? And if so, is it likely to be Flexicalymene? The piece has several Flexi bits on it; a couple of pygidia and some free cheeks, the reverse has three cranidia. But I think there are Isotelus fragments present, too. The specimen is 5 mm wide. Thank you very much as always for any opinions and help.
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First of all, is this a hypostome? If so, is it a damaged one from Isotelus? Found in the Kope Formation, Ordovician along AA Highway in Kentucky. Thanks for looking at it and giving an opinion. Mike
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Any idea what species of trilobite this comes from? (Or correct me if I’m wrong in my assumption that it is a trilobite hypostome) Tully, NY
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This past weekend, I had a chance to collect a well known roadcut outside of Clermont Iowa. The site is Ordovician in age and exposes the Clermont section of the Maquoketa Formation. one of the interesting pieces that I collected was this tiny trilobite. As you can see from the picture,There is not much to go on however the hypostome is preserved. I am hopeful the Trilobite will be complete and was wondering if anyone might know what species it is/could be. Any help is appreciated.
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What a haul! Rare goodies from the St. Leon roadcut, Indiana. (Trilobites!)
FossilSniper posted a topic in Fossil Hunting Trips
About a month ago, I headed out on two fossil trips to the well-known St. Leon roadcut in Indiana. I was hunting in the Liberty formation (late Ordovician) with the sole goal of finding some nice trilobites (which I definitely achieved!). Along with multiple rare trilobites, I was able to find some excellent examples of other fossils. The spoils were totally awesome, and I am itching to go back. I hope you enjoy. Best for last.- 25 replies
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Over a month ago I found what I believe is my first hypostome near House Springs, Missouri. But it is much larger than the other trilobite pieces that I have found in the area. Since then I have been to the same roadcut and found what I believe to be two larger trilobite tails that might be something like Isotelus which may be the source of the hypostome. I just want other people's opinions if they think I'm on the track.
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Found this in pile of waldron shale, could this be the ventral part of a Trimerus trilobite, possibly part of the hypostome? I searched the web for any documents to show a hypostome from that trilobite, but no luck. Packy
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