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Showing results for tags 'Ordovician'.
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From the album: Trilobites
Missing cheeks.-
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From the album: Trilobites
Found on May 2023 dig. U. Ordovician, Ontario.-
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From the album: Trilobites
Found on May dig. U. Ordovician, Ontario.-
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Hello y’all! On Sunday, my close friend@KompsFossilsNMinerals and I met up once again to do some collecting at La Familia quarry in search of some good trilobites, and as always, we didn’t leave empty handed! We hit a few different sections of the strata, and we managed to have some level of success at every spot we worked.
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- new york
- ordovician
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I've been fascinated with Aegirocassis for a while now. The fact that a complex, giant filter feeder occured so many millions of years ago astonishes me. Its just such an alien animal. I've found little fragments of arthropod molts in the Drakes formation which belong to Isotelus. That got me wondering. What are the chances that instead of these all being from isotelus, that they're instead from another arthropod such as a eurypterid or ordovician radiodont. Another question I have is, does aegirocassis or a radiodont related to aegirocassis occur in any places other than morocco. The Drakes formation seems to have experienced a submarine landslide (don't quote me on this) and most to all of the fossils there are of creatures that were overtaken by said landslide. (Not entirely sure if this is true) But, what if there were such radiodonts like aegirocassis living in the Drakes formation but the only fossils we would find of them is molt fragments like the ones I've found that fell off of the animal and were buried in the sediment, instead of whole body fossils because they were able to escape this landslide. Though, I suppose the only way to confirm that such a radiodont lived in the Drakes would be to find an actual fossilized corpse of one. Really I just think this is a fun idea but it definitely would be cool if it is true.
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Taxonomy from Fossilworks.com. Synonym Ectenocrinus canadensis Billings 1857. Ectenocrinus simplex can be well recognized by its distinctive trimeric columnals. References: Hall, J. (1847). Containing descriptions of the organic remains of the lower division of the New York system (equivalent of the Lower Silurian rocks of Europe). Paleontology of New York 1:1-338. Titus, R. (1989). Clinal Variation in the Evolution of Ectenocrinus simplex. Journal of Paleontology Vol. 63, No. 1 (Jan., 1989), pp. 81-91. Warn, J. and Strimple, H. L. (1977). The disparid inadunate superfamilies Homocrinacea and Cincinnaticrinacea (Echinodermata, Crinoidea), Ordovician-Silurian, North America (Bulletins of American Paleontology, 72, 138 p. H. Alghaled (2019). An Upper Ordovician faunal assemblage from the Neuville Formation of Québec, including an exceptionally preserved soft bodied sea anemone, Paleocerianthus neuvillii n. sp., Université de Montréal. MSc. thesis.
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I found a unique fossil in the Ordovician formation, but I'm unsure if it's coral or something else. Any thoughts or suggestions?
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Hello, everyone; This is a hash plate from the lower Decorah Shale of St. Paul, Minnesota. The central item in the photos is a thin dark fossil with crenulated segments. It appears that the fossil forms a nearly complete perimeter, defining a cross-section that seems to be uninterrupted on the side in the block but pinched into a bilobe on the side facing away from the block (either natural or crushed into that shape from a cylindrical or oval cross-section). Where the lobes pinch there is what appears to be a sediment-filled longitudinal gap. The scale bar has colored alternating millimeters, so we're looking at something a few millimeters across. My immediate thought was that this is phosphatic, as it is preserved similarly to trilobite fragments in the same plate (and in the Decorah in general). I can rule out most of the common groups immediately based on the apparent composition and general shape (sponges, corals, bryozoans, brachiopods, mollusks, and echinoderms). Because of the similarity to trilobite preservation, I first thought arthropod, but it certainly doesn't appear to be trilobitic. Obviously it's not an ostracode. I have very little experience with eurypterids but it doesn't seem like them, either. The other thing I've been considering is a machaeridian worm fragment, which would explain the apparent longitudinal gap and bilobed cross-section, but that crenulation thing is curious. Would any of you have any thoughts on this object?
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Hi folks, I made a long trip to several sites yesterday and brought home a couple of oddballs. First up, from St. Leon, I think this is Tetradium. I've found it before at this site and had it id'd here, but this appears pyritized and a bit different, maybe a bit larger segments? Thoughts? Second, from Lawrenceburg. I thought this was a giant gastropod wrapped in bryozoan when I first found it, but now I think it's just a very snail-like bryozoan growth. Can you see the spiral? Also from Lawrenceburg, is this oddity. The crater thing in the middle. Looks a lot like a crinoid calyx seen from the bottom, but I've never seen a calyx like this from either of these ordovician sites. Has a very bryozoan like texture around the top, but then gets smooth as it goes down. I suspect this is also a really odd bryozoan growth, but tell me what you think. Finally, there is this thing. I've been really wanting to find an Isotelus, so when I saw this, well, I said some choice words. Apologies for no scale, this was perched pretty high up in the Lawrenceburg cut. It's still there, as I convinced myself it had to be something else and it was on a big slab. It was around 6-8" long from top to bottom in the photo. I actually brought home a partial one of these before, but never ran it down to figure out what it is. It has a very defined edge along the right, that has a small "bead" on it, if you will. (Bead like in woodworking, if that helps.) Thanks!
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I found these two pieces in the Drakes formation of Louisville, Kentucky a little while ago. I'm 85% sure that these are molt fragments from Isotelus maximus but needed a second opinion. One could argue that these are simply iron coatings on pebbles, but if you look at the second one, the "coating" dips down into the pebble, and is also mixed in with a few other fossils such as vinlandostrophia. Then again I could still be wrong, I have been before.
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From the album: Purchased Trilobites of Isotelus2883
Isotelus gigas from the Walcott Rust quarry. It is nicely inflated, but not very well-preserved. I got it for next to nothing though, so no complaints. -
From article: New fossil site in Taichoute, Morocco, suggests giant arthropods, up to 2 meters long, dominated the seas 470 million years ago. The site offers new insights into the Fezouata Biota and early life on Earth. https://scitechdaily.com/ancient-giants-uncovered-fossil-site-sheds-light-on-arthropod-dominance-470-million-years-ago/ Paper https://www.nature.com/articles/s41598-022-25000-z
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Crinoid calyx or echinoid? Found in gravel with Ordovician-Devonian fossils. About 2cm across at the widest point. Druzy coating over the fossil which seems to be an external mould. In orange jasper. Thanks so much!
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Hey everyone, I wanted to show this fossil I found back in November as I think it's pretty cool. On my first trip that involved splitting shale, I found this Triarthrus cephalon, which is cool on it's own but it was only later that I looked back to it and realized the particular shape that resides on top of and below the cephalon. This trilobite appears to have been buried with the shell of a nautiloid! Please excuse if it's hard to see, the first few pictures were really difficult to get and my phone isn't the best at taking close up shots as it is. The 1st and second pictures represent the two halves of the piece, while the 3rd and 4th pictures are the same thing with a rough tracing of where the shell is. The 5th picture is an older picture I came across while making this post that while blurry shows the shaping somewhat decently. So yeah, there's a pretty cool find in my collection, I don't know how rare this kind of thing is or how they ended up together but I think it's really fascinating anyway!
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I have been working on my undergraduate thesis for a little town called Cow Head in Newfoundland, Canada. This area is a part of the Cow Head group, specifically the Stearing Island beds, making it Lower Ordovician. I'm asking about the little circular guy in the top right. If anyone has any idea what it may be (if it even is a fossil) that would be great, any help would be greatly appreciated! I would love to credit you in our paper if you'd like! I attached images of the thin section in both plane polarized and cross polarized light. Thank you!
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Brookville, Indiana, St. Leon, Indiana and Wilder, Kentucky Road Trip
Nimravis posted a topic in Fossil Hunting Trips
Yesterday (5-5-23), I decided to take a quick 4 1/2 hour trip (350 miles- one way) down to the tri-state area to collect Ordovician road cut fossils in Indiana, Kentucky and Ohio. Before heading back today I did more collecting and also hit the Geo Fair that was held in Sharonville, Ohio. This post will show the types of fossils that I came across, some I kept, many I left and some will be passed out at the ESCONI Braceville Shaft Mine trip tomorrow. BROOKVILLE, INDIANA- This is a great roadcut to collect, but it is a tall location on 45 degree angle and very easy to loose your footing and slide down. There were a ton of Turkey Vultures flying overhead, here are a few. Vilandistrophia (?) Partial Caritodens Rafinesquina Stromatoporoid- Ambonychia- Ambonychia and Caritodens- Cyclonena- Hebertella- Horn Coral- Other misc pieces-
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From the album: Purchased Trilobites of Isotelus2883
Probably from the Aseri/Asery of the St. Petersburg region. There was not a lot of information given, but it was a quite aesthetically pleasing specimen.-
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From the album: Purchased Trilobites of Isotelus2883
This one is from the Aseri/Asery level in the St. Petersburg region. This one is one of my higher quality pieces. View of thorax and pygidium.-
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From the album: Purchased Trilobites of Isotelus2883
This one is from the Aseri/Asery level in the St. Petersburg region. This one is one of my higher quality pieces. View of cephalon. -
From the album: Purchased Trilobites of Isotelus2883
Maquoketa formation, This one was bought in-person from the Past and Present shop in Blasdell. It has a genal spine preserved, which is somewhat uncommon. -
Hello all, Below are my best specimens from the Ordovician family of Eurypterids know as Megalograptus. Top to Bottom. undet. Megalograptid from the Reedsville shale at Swatara gap, Pennsylvania. Then 2 Megalograptus ohioensis from the Cincinnatian shales in Ohio. Note the Isotelus head on the bottom specimen. Undet. Megalograptid from the Pontgrave Formation in Canada. Lastly another Megalograptus ohioensis.
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I’ll show my collection here. 1. Agnostida This is my only example from this order. Itagnostus interstrictus Wheeler Shale U-dig Quarry, Delta, Millard County, Utah Middle Cambrian Purchased Scale bar is 1 cm.
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From the album: Nautiloid’s Trilobite Collection
Hypodicranotus striatulus I found on February 19, 2023 while collecting at La Familia Quarry. It’s from the Middle Ordovician Trenton Group, and was found in a stratigraphic section where the species has never been documented. Unlike the vast majority of H. striatulus specimens, this one came from a thin bedded shale unit. Because of this, it is more compressed than most specimens, although the detail is still outstanding.© Owen Yonkin 2023
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- new york
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I collected this disarticulated cystoid from the Kimmswick Formation (Late Ordovician) in eastern Missouri. Cystoids are well outside my wheelhouse, so I was hoping someone here might be able to help me narrow down an ID, if one can be made at all from what's present. Thanks for any help.
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From the album: Urban Fossils of Toronto (Georgian Bay Formation, Lower Member)
Conularia formosa (Miller and Dyer, 1878). Georgian Bay formation, Lower Member, Late Ordovician. Found along the Humber River of Toronto. This specimen was found when I was smashing some of the limestone of a bedding and this popped out. This is the only Conularia formosa I have ever found along the Humber River.© JUAN EMMANUEL
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