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Showing results for tags 'placoderm'.
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From the album: Fossildude's Upper Devonian Fish Fossils
Metzgers' Quarry, Canton, PA. Bothriolepis sp. head shield partial Catskill Formation© 2021 T. Jones
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This past weekend, I had the pleasure of hunting with my rock club in central Iowa. I found what I think is placoderm, though there was multiple opinions given to me. Nothing earth shattering, but exciting for me! Can you help clarify the ID of the specimens? The last piece broke revealing more "placoderm" inside.
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I recently discovered this in the Devonian Onondaga Formation of Ontario and am thinking it’s either a Placoderm or a Onychodontid based off the armour like texture which does not match any coral in the formation, their is also the presence of odd spine like structures. Any idea if it is one of these species?
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Dunkleosteus jaw: Is it real?
Praefectus posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hello. I was wondering if I could get some opinions on the authenticity of this Dunkleosteus jaw. The jaw is coming from the Devonian of Morocco. It measures 12" long by 4" tall. The seller indicates that only the tip of the jaw was restored, but I suspect that the restoration may extend further. Thank you for your help. @Mioplosus_Lover24 Care to weigh in? Thanks..thumb.jpg.c41a054f903ffd14f1bde65c75e355fe.jpg)
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I was wondering if a complete or fairly complete placoderm skull/head has ever been found at Arkona? I am just curious as what this would look like, and because I have a few placoderm bits and pieces myself, pictures of such a fossil could possibly help me to figure out where these pieces came from. (This is mostly out of curiosity though because I know small placoderm bits are basically impossible to identify)
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This is continuing the first post. The Tioga site is a near shore exposure of the entire Catskill formation. So besides the general Holoptychius and bothriolepis fauna, lungfish have been described from a skull table and tooth plates. Here is a tooth plate from Dipterous fliescheri. A similar plate was described from the Troy, PA area.
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Hello everyone! I have recently purchased this skull roof from an actinolepid placoderm from the lower Devonian of Ukraine, The fossil was labelled as Kujdanowiaspis, but there is also a closely related genus found there called Erikaspis. I have been looking at several papers to try and see what distinguishes the two and if it is possible to tell what mine is but right now I am not sure. Any help identifying the genus and even species if possible would be great, Thank you
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From the album: Vertebrates
Millerosteus minor Miller, 1858 Middle Devonian Eifelian Caithness Scotland Millerosteus minor (named after Hugh Miller, a Scottish geologist and paleontologist 1802-1856) was a small arthrodire placoderm, rarely exceeding 15cm. The extinct armored fishes known as placoderms make up what is considered to be the earliest branch of the gnathostome family tree -- the earliest branch of the jawed fishes. Arthrodires possessed jaws but no teeth. Razor-sharp bony dental plates formed sort of a beak and allowed to gnaw on prey. Arthrodires (“jointed neck”) are characterized by an unusual joint in the dorsal armor between the head and neck regions; this joint apparently allowed the head to move upwards as the jaw dropped downwards, creating a larger gape. In addition, it also had an internal joint between its neck vertebrae and the back of the skull, allowing for the mouth to be opened even wider and being able to feed on rather large prey. Millerosteus probably fed on invertebrates such as crustaceans and mollusks or even was a mud-grubber that ingested organic-rich mud for its food. Arthrodires possessed a heavily armored head- and neck-region. The slender fish-like body and the heterocercal tail that extends behind the heavily armored portion is, because it is almost naked or only covered with small scales, rarely preserved. Millerosteus is a rather common fish in the Middle Devonian flagstones around Caithness. -
Hi is there any possible way this could be pieces of Placoderm armour or bones? There very different from what I usually find in the area and seem to be vertebrate in origin if it’s not geologic.
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Mongolian Placoderm Fossil Might Change Our Ideas About Shark Evolution
Scylla posted a topic in Fossil News
We thought sharks' cartilaginous skeletons existed because endochondral bone evolved after sharks branched off the family tree, but this Placoderm common ancestor of sharks and bony fishes has bone. This indicates that sharks may have lost the ability to make endochondral bone. https://phys.org/news/2020-09-ancient-bony-fish-rethink-sharks.html-
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Just got back from a 5 day trip to western NSW where we visited a number of sites, some of which we had not visited before. Will post more photos and information over the next few days as I have a lot to photograph, but here are some field shots from day two (our first collecting day)... Our first site was located near Grenfell and is known for its excellent Devonian fish fauna, including placoderms and sarcopterygians. While not as well preserved as the nearby Canowindra site, these are collectable which is a start . We were only given a vague site on a hillside located on private property, so once we had permission to access the site the next issue was finding where the fossil bearing layers were. This involved climbing a very steep hill and breaking open any rocks we saw, and after finding evidence of placoderm plates the next task was to figure out where they originated. A number of fossil bearing layers were found and it seems the material is very extensively distributed, presumably occurring throughout the surrounding hills as well. Here are some photos of one rock face we worked and the terrain - There were a number of rocks with exposed fossils on them, for example this one which is covered in ornamentation from placoderm plates. And here is a field photo of a partial Sarcopterygian(?) jaw, my thumb is on the left for scale.
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Last weekend we were invited by a few friends to joint hem on a fieldtrip in Famennian ( Late Devonian ) deposits in Belgium. They sometimes visit this place specifically to look for Devonian plant material. Although paleobatany is not our cup of tea they convinced us to come along because they had also found fish remains from time to time, so we tagged along in the hope to find some Devonian fish. At first we didn’t find much apart from the plant material, but one of our friends led us to a boulder where he had seen some fish scales on a previous visit. And indeed, after closer inspection we saw a big scale on the surface, but also a fish tooth from a Dipneustes. So once we knew what to look for we checked out different layers with the same correlation as the one where we had the first fish remains. It didn’t take us long after that to find a deposit where we found other fish remains, although the layer was hard to get to we did find some loose rocks from there that we cracked open with good results. Finally we got home with multiple scales from Holoptychi and Tristichopterids, a few Dipneustes teeth and we even found a quite impressive Arthrodire placoderm jaw. Most of this material was really brittle and we had to consolidate most of the specimens before extracting them. I would say not a bad catch for a first try at famennian fish Field pictures: This is an overview of some of the best finds from that day: dipnoi teeth: Tristichopterid: Holoptychius: The placoderm jaw:
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Found this nice slate blue piece in my recent trip to Western New York. What do you guys think? The piece isn’t very big, maybe half an inch - but it looks relatively thick, maybe a centimeter and a half?
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Today on a hunt in the lower devonian of new york, I found on of the most unusual piece and I can't decide if its bryzoan or possible placoderm.
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I found this fossil in Devonian rock in Johnson County, Iowa. I think it is a fossil of a placoderm fish, and I think it has a "fin" next to the quarter in the photo. The fin would be coming out of the placoderm plate at a perpendicular angle, which would make sense, but I have never found a fin before. I will attach a close-up photo of the "fin" below. Am I on the right track or is this something else? Thank you! Ben
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I bought a small fossil collection that contained several Erismatopterus levatus and it also contained several unidentifiable and unlabeled items, in particular this piece. It reminds me almost of a placoderm skull plate, but I honestly don't have any idea. There's area of denticles on the side of the fossil.
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Hi all! I pulled this fossil out of Red Hill, a Devonian site in central Pennsylvania. I thought it looks like it could possibly be part of a placoderm but I’d love to get some help with further identification. Thanks in advance!
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Leicester Pyrite Member. This layer between the Windom and the Geneseo black shale represents a sea of death. I find very few types of fossils in this hard to process layer of solid pyrite. Well preserved cephalopods and Placoderm armor (Placodermi is a class of armored prehistoric fish) are the most common fossils found. This very thin horizon can be easily found in the outcrop if you just look for rust dripping down and staining the grey shales below this pyrite layer. Every year or two, a piece of Leicester Pyrite will fall from its position high up in the outcrop and slide down to the creeks edge. It takes a lot of work to process the pyrite for fossils. Every blow with your hammer delivers the strong smell of sulfur and a ton of sparks. The reward for all this patience and hard work are fossils preserved in brilliant fools gold. This unit is also the only rocks in my area that routinely contain the armor of Placoderm fish. Click this link for a detailed description of this unusual formation - http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.835.6976&rep=rep1&type=pdf&fbclid=IwAR0qdFymJq-Hd1_SqU3j3yDw5Trl0ih_KohTv-26Du3b1m9g9s2IYKlW0Xc
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Hey everyone, I am curious if this is a placoderm armor plate. It is from Schoharie quarry, NY. Thanks.
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Can this be identified as Dunkleosteus? It's from Ashtabula, Ohio on auction site.
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Found the usual goodies at Paulding today. But I'll only show this photo of a nice, thick chunk of Placoderm armor. This is embedded in hard limestone, so I think it's from the underlying Dundee Limestone Fm., rather than the Silica Shale Fm. (For those unfamiliar with the Paulding Locality, these are quarry dump piles). This is one of two placoderm pieces I found today. The color alone makes this a desirable find, let alone the cool factor of what it is.
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I had a chance to visit Penn-Dixie today and one of my first finds stumped me. It has the signature porous inside of a bone. It’s black. It has radiating lines down one side. Folks running the place thought it was likely a piece a placoderm armor, making it a rare find. Apologies for the pictures. Once again I find myself in a hotel with my phone. Thickness is a bit over a quarter inch. Length is around 1.75”. Couldn’t make the phone focus well on the marrow. Does placoderm armor have marrow?
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It's been about five months since I've been able to get out and dig, so when my collecting comrade and I arranged it, off we went. The weather was perfect, although it was muddy going. Spent about a day and a half at our site. Finds were not the best for some species, but the focus was more on site preparation. Pictured here are some Greenops widderensis. Both are missing parts, so will likely be in the grafting pile:
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Although we are currently in the depths of February, spring is just around the corner! With spring comes spring break and a week of digging!! One of the locations I am planning a visit to is Jamesville quarry in Jamesville NY. I would love to unearth some nice placoderm pieces. If anybody has info about the site, especially who to contact for permission, I'd greatly appreciate it!
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From the album: Sharks and fish
Cross section of dunkleosteus' armor plate showing internal structure of mostly solid bone
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