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  1. I am really puzzled on this new one, I have explored phyllocarids, trilobites, and many others, and can't seem to find a good match for it. I am not absolutely positive it is a fossil though, just the surface texture and way it prepped makes me think it is. It is from the Leighton Fm, which is Silurian, Pridoli. When I first started prepping this, I was under the impression that this was the internal mold of a Chonetes bastini, which is why I started on it. I soon discovered though that it couldn't be from a brachiopod, and now I am stumped on it. The first specimen is completely
  2. In this thread, I hope to share numerous examples of the ostracods of the Leighton Formation. As I identify them to at least genus level, if not species, I hope to post them here. If anyone has a better suggestion for the id, please let me know. First up is a cast of a left valve, female, Hemsiella maccoyianna sulcata. Length is approximately 900 microns. Literature on the subspecies: Copeland, M. J. (1964) Canadian Fossil Ostracoda, Some Silurian Species. Geological Society of Canada 117. https://emrlibrary.gov.yk.ca/gsc/bulletins/117.pdf Martinsson,
  3. Mainefossils

    Leighton Formation Conodont?

    So, I have just found this highly-suspect fossil - my guess is a conodont. I saw it as I was examining pieces of shale, and thought it was worth looking at under the microscope. It seems to have the diagnostic features, even the transition of colors between the blue base and white tips. I was hoping for some of your options on it. If this is a conodont, it would be the first from this formation. My guess would be a Ozarkadina sp - it is a very common Silurian conodont here, and some of the elements look remarkably similar to my specimen. This specimen came from the very fossilifer
  4. Mainefossils

    Coprolite?

    I have just found this little coprolite? yesterday. This is the second time a coprolite-like fossil has turned up in the shale from the Leighton Fm. I am not really sure on this one, though, due to the presence of crinoid stems. The fossil(s) are from the Leighton Formation, Maine; which is Pridoli, Silurian. The main reason I think it is a coprolite is because of its situation in the shale. The rest of the shale around it is relatively uniform, with no fossils whatsoever. The fossils present in it are one crinoid stem, quite a few ostracods, a very small Orbiculoidea brachiopod,
  5. Mainefossils

    Phyllocarid valve?

    This morning I split this shale (technically it fell apart on me), and found this interesting little fossil. I was thinking that there was a possibility of it being a phyllocarid valve, but I have never seen one. This also raises a question that I have been wondering - how do you differentiate between a phyllocarid and a bivalve valve when the tail is absent? What raised my suspicions on this specimen are the raised bumps on the external mold and the depressions on the cast. The pictures below are of the specimen. The first shows the cast/internal mold, and the second the externa
  6. Again, here is another invertebrate I have not been able to identify. Either way, my original guess was a trilobite pygidium, until I reviewed the fossil under different lighting, and then saw that it matched no known trilobites from this formation. So I am at a loss here. It is Pridoli, Silurian. For anyone who is interested, this came from a recent excursion to the Leighton Formation. It was found in a layer that contained only Chonetes bastini brachiopods and a few ostracods - with some possible fish bits. In the pictures below, the fossil is shown und
  7. Mainefossils

    Gastropod ID

    So, I have been preparing this nice little gastropod. I have seen five other specimens that shared the same characteristics, but, unfortunately, some of them did not make it. Before I continued to prep this one, I was wondering if it is possible to roughly ID this gastropod. It would greatly facilitate prep work to have a good idea of its shape. All the specimens I have seen have had three whorls. The upper two whorl's ridges are almost absent, this has been consistent through all my specimens. The shape of the shell is coeloconoid. It was found in the Leighton Formati
  8. Mainefossils

    Rhynchotrema sp?

    I am unsure on the identification of this brachiopod. It is from the Leighton Formation, Maine; which is Silurian, Pridoli. According to Maine's Paleozoic Record (an excellent book that lists all the fauna and flora found in formations across Maine), there are only two Rhynchonellid genera in this formation, Camarotoechia and Rhynchotrema. It does not look like a Camarotoechia, but I cannot find many references for the internal mold of Rhynchotrema brachiopods. I would appreciate any references you have on this genus, as well as any advice on the identification of it (@Tidgy's Dad
  9. Mainefossils

    Camarotoechia brachiopod

    I finished prepping this specimen recently, an unidentified Camarotoechia brachiopod. It exhibits an uncommon/rare orange coloration; only about 1/100 of Camarotoechia brachiopods show it. This one, though, unfortunately has some compression damage on the right side, and some of the ridges have pieces missing. The pictures below first show the pre-prep photo (which I finally remembered to take), and the post-prep. Thanks everyone for reading!
  10. Mainefossils

    Platyceras sp.

    I have a nice little gastropod in my collection, from my most recent trip to the Leighton formation. I am pretty certain that this is a Platyceras sp, such as the one shown in the plate below, figures 23 - 24. Boucot, A. J., Yochelson, E. L. (1966) Paleozoic Gastropoda from the Moose River Synclinorium, Northern Maine. Geological Survey Professional Paper, 503(A). https://pubs.usgs.gov/pp/0503a/report.pdf I do not believe that specimens such as these have been assigned to species as of yet, and would greatly appreciate to hear any
  11. Mainefossils

    Brachiopod id

    This is another fossil from the Silurian Leighton Fm, Maine. It is an excellently preserved internal and external mold of a brachiopod. It is similar to the Salopina species that I am constantly finding in this formation, but this brachiopod's valve is more strongly curved, instead of almost flat. It also has less numerous striae, and they almost reach the median process. As well as this, the dental plate is thinner and curves inward more strongly, and the ctenophoridium is wider. Any help on its identification would be greatly appreciated. Here are some pictures of it (internal mold on the le
  12. I have just found this microfossil. It is unfortunately incomplete, but the general shape is still discernible. I have two ideas for this specimen, a fish scale or an inarticulate brachiopod. Of these possibilities, I think that inarticulate brachiopod is more probable. The shape, "growth rings", and slight depression in the top lead me to this conclusion. On the other hand, its size, color, and the absence of such brachiopods from this formation, lead me towards fish scale. I am uncertain on both, and could use some help with this one. The specimen is the from the Leighton Formati
  13. Mainefossils

    Salopina Brachiopod

    I have just finished preparing this nice pair of brachiopods. I am pretty certain that they are of the genus Salopina, but am not totally positive. The genus is marked as one of the most common brachiopods found in the Leighton Fm, as well as being considered a defining characteristic of this formation. Even though they are so common, I really never tire of them. The way these brachiopods were preserved, though, is rather interesting. @DPS Ammonite kindly acquainted me with the fact that these specimens are not internal molds, as I (pretty sillily) first thought. It s
  14. Mainefossils

    Fish Coprolite?

    I have read in multiple papers that there are three theories to the preservation of thelodont scales. First, a rapid burial when the thelodonts have died under still circumstances, e. g., in a lagoon or other still body of water. This results in associated scales. Second, the thelodonts die and disintegrate in the open ocean, leaving behind disassociated scales. Third, the thelodonts were eaten, and deposited as coprolites. Now, I have just found an array of thelodont scales in a single small spot. The stone they are preserved in is a lighter color than the rest of the shale. The
  15. Mainefossils

    Tentaculite species identification

    I have found a few Tentaculites specimens from the Leighton Formation, Maine; which is Pridoli, Silurian. I was wondering if it is possible to ID them to species, based on the external molds alone. I have read in a few papers that many tentaculite species are identified by the number and shape of the rings on the shell exterior. Unfortunately, I have not been able to many definitive papers on USA Tentaculites sp, and their identification. The specimen below is only of the external mold. This is the best preserved, as well as smallest, of the specimens that I have collected.
  16. I have just finished preparing this little fossil. I really have not seen anything like it. It reminds me of a eurypterid head fragment, or something similar, but the ridges on the "internal mold" are perplexing. Also, it is horizontally symmetrical, suggesting a scale or segment. It is from the Leighton Formation, Maine; which is Pridoli, Silurian. The pictures below first show the "internal mold" under raking light, than of it under direct light. The third picture is of the "external mold" under direct light. It does not have any surface detail that would be brought out by rakin
  17. Mainefossils

    Unknown Leighton Formation Fossil

    When I first started prepping this one, only the tip of the bottom right corner was showing. I initially that that it was a trilobite free cheek, which is quite a common find for this formation. About half-way through, I realized that it was not what I had initially thought. Now that I see it fully prepped, I have absolutely no idea what it is. Approximately half of it had crumbled before I started preparing it, due to the soft siltstone it was preserved in. Any help would be greatly appreciated. The pictures are taken with direct light, as there are no small details on the surfac
  18. Mainefossils

    Conularid?

    So, in a previous post, I asked for the identification of a piece of an orthocone nautiloid. The general consensus was that it was a Spyroceras sp, or related genera. Now, I have found two specimens, which show some of the characteristics that that piece had. I first thought that they were nautiloids, but since they both had the same general structure and orientation, I began to wonder if they are Conularids. The morphology does not seem right, namely the separation between parts of the internal mold and its large segments; but I am at a loss to think of something better. The two s
  19. Mainefossils

    Unknown fossil (myodocope ostracod?)

    I have been finding these small little fossils all through my specimens from the Leighton Formation, which is Pridoli. I suspect that they are myodocope ostracods, but I haven't found any ostracods that match it from my available literature. The specimen below appears to be an association of two valves. Each individual valve has a small protuberance in the middle, with two pits next to it; they are approximately 4 millimeters long, by 1.5 millimeters wide. The pictures below are first of photo with direct lighting, then a photo with raking light, to show the protuberances. Any hel
  20. Mainefossils

    Number 2 invert fossil

    This is another fossil that has me stumped. I think that there is a possibility of bryozoan, because of the pits, but I remain unconvinced. It is from the Leighton Formation, which is Pridoli. The pictures below are of the fossil under raking lighting, to show the pits, then of it under lighting from directly above, and finally with scale (mm). Thanks everyone!
  21. Mainefossils

    Unknown invert fossil

    I have been going through my collection, and came across this fossil. It is from the Leighton Formation, Maine, which is Pridoli. It is preserved in a gray shale. I was thinking that it might be a Receptaculid, but that did not seem to quite fit. In the pictures below, the top is of the cast of it, and the middle photo is the external mold, and the furthest down is it with scale (millimeters). Thanks everyone for your help!
  22. Mainefossils

    Tentaculites vs nautiloid id

    This is a another specimen from the Leighton Fm, Maine, Silurian. I uncovered it a while ago, and at first thought that it was a crinoid stem. On second look, though, I realized that the segments on the "stem" were curving inwards, instead of outwards. Furthermore, what I first that was the stem fading into the rock was actually the width and depth decreasing. I am torn between a Tentaculites sp., which is not known specifically from this formation but shows superficial resemblance to this specimen; and a small orthocone nautiloid, which is known from this formation. Any help on its id would b
  23. Mainefossils

    Calymene trilobite ID

    These are more trilobite segments, and one cephalon, from the Leighton Formation, Maine, silurian. I believe them to be the new species of Calymene trilobite that I found earlier, but am unsure. The first pictures are of the first specimen, numbers 1 and 2 being of the cephalon, and the third of a thorax segment that was underneath the cephalon (you can see the edges of it in picture 2): The next pictures are of new specimens. Number one and two are of a cephalon. Unfortunately, I was unaware of its existence until after it came out in multiple piece
  24. Mainefossils

    Orthocone nautiloid ID

    This is my first almost complete internal mold of an orthocone nautiloid. It is from the Leighton Fm, Maine. From the little I can see of the external mold, I believe it to have the same grooves as in the Possible Fossil Coral post, but I am unsure. Help on the general id of it would be greatly appreciated. Here are some pictures of it:
  25. Mainefossils

    Chonetes bastini

    Chonetes bastini was first described from the Leighton Fm, also called the Pembroke Fm. It is differentiated from other species by the number of spines and its finer more numerous striae. Most specimens are missing the hinge spines. The above pictures show the pedicle valve. A poorly preserved original or cast of the shell exterior is in the left side photo. Some of the exterior of the shell may be missing since there is a horizontal groove above the shell where shell may have once filled it. The right photo shows an exterior impression or mold. Williams, Henry Sha
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