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  • *Pseudofossils ( Inorganic objects , markings, or impressions that resemble fossils.)

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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

    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
  4. Mainefossils

    Mainefossil's Documents

    I thought I would start this thread to share some documents that pertain to Maine fossils. I hope to share geological reports and maps, as well as papers that can be used to identify much of Maine's extinct flora and fauna. Many of these papers will not have been made specifically for Maine, but can still be used to identify some widespread taxa - such as conodonts, ostracods, and brachiopods - to genus or even species level. Below is a map of Maine, for those members who are not familiar. The geology maps and reports that I share will be arranged according to the county(s) that th
  5. 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
  6. 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
  7. 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
  8. CZ Wang

    Algae or graptolite or what?

    I check this website from time to time and always learn something new. I am a bedrock geologist for many years - although I had a good training in paleontology, I still have to work hard to try to figure out a fossil. I recently and currently map rocks in northern Maine. The pictures show below are from a recently discovered greenbed basin (probably aged middle-late Early Devonian and deposited in a continental or sea-land transitional environment). My question is what are the dark-colored pieces? They don't look like burrows because they don't occur across layers. They don't look like tracks
  9. Rockwood

    Anomalocarid ?

    I was packing up to call it a day searching crushed rock out by the old rail siding when I noticed this. Could it be ? The finds there are Ordovician I think.
  10. 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
  11. Rockwood

    Emsian mystery

    I took advantage of a cold day to sneak into the quarry. It's mud season and this road is one that has the potential to be a walk back from. I think it is most likely in the Emsian, Tomhegan formation. There is actually a fairly good representation of typical finds in the shot taken for scale. There appears to be a crinoid stem, or feeding arm near by, but what is the other shape/object ?
  12. 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
  13. 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:
  14. 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
  15. Mainefossils

    Actinopteria bella

    Actinopteria bella is a species of bivalve found in the Leighton/Pembroke Fm, and first described by Henry S. Williams. It is differentiated from A. fornicata by less convexity in its shell and a wider beak. It is differentiated from A. dispar by its shorter shell. The above pictures are of the left valve. A poorly preserved original or cast of the shell exterior is on the left side. Some of the exterior of the shell may be missing since the exterior ribs have less than normal height. The right photo is an exterior impression or mold. Some of the shell may be present on
  16. Mainefossils

    Actinopteria bella

    This is another fossil from the Leighton Fm, Maine. It is an Actinopteria bella, a bivalve that was first described at this formation (here, https://repository.si.edu/bitstream/handle/10088/14399/1/USNMP-45_1985_1913.pdf). I have had multiple specimens of it, but this is the first one that came out in one piece. The pictures below are of the internal and external mold (top to bottom).
  17. Mainefossils

    Gastropod ID

    Fossil Forum, I have recently uncovered the external mold of a gastropod. I am thinking that it is Platyschisma helicites, but am unsure. The main problem is that I am unaware of the formation it is from. I found it right next to an outcrop of the Leighton Formation, but the fauna and the matrix does not match it. It might be from the Edmunds Formation, but I am unsure of this too. Either way, they are both Silurian. Any help on its ID would be appreciated. Here are some pictures of it:
  18. Mainefossils

    Gnathasome fish scales

    Fossil forum, I have just finished uncovering a gnathasome fish scale. It is from the Leighton Fm, Maine. I believe it to be in the genus Gomphoncus, maybe even Gomphoncus sandelenis, which was described as being in the Eastport Formation (https://www.erudit.org/fr/revues/ageo/2018-v54-ageo04224/1055415ar.pdf). I am unsure of this id though, mainly because of the pit in the largest end of the scale. It is approximately 200 microns long by 250 microns wide by 200 microns deep. Any help on the id of the genus, or maybe even the species, would be greatly appreciated. Here are some pictures
  19. Mainefossils

    Fish microfossil

    Fossil forum, This is another fossil from the Leighton Fm. I just finished recovering it from some fossiliferous rock I brought back with me. It is about 575 microns long. Any help on its id would be appreciated. Here is a picture of it:
  20. Mainefossils

    Conodont element?

    Fossil forum, I just uncovered this possible fossil. It is from the Leighton Fm. To be honest, I am not sure it is actually a fossil, but I wanted to check. I was thinking that it could be a conodont element, but am unsure. Any help on its id would be helpful. Here are some pictures of it:
  21. Mainefossils

    Trilobite cheek?

    Fossil forum, This is another fossil from the Leighton fm. I have just uncovered it, and at first thought it was a trilobite cheek. On closer inspection I realized that the external and internal mold are not smooth, but appear slightly porous. As well as this, the ridge appears too high in both molds. Any help on its id would be appreciated. Here are some pictures of it (internal mold on the left, external on the right):
  22. Mainefossils

    Orthocone nautiloid

    Fossil forum, This is another fossil from the Leighton formation. It is a completely undamaged orthocone nautiloid. I think it is the same species that I showed earlier in the possible fossil coral post, but I am not sure. The external mold has the same grooves, but the internal mold is divided into two sides, each with bumps. Is this normal for a nautiloid fossil? Any help would be appreciated. Here are some pictures of it (internal mold on the left, external mold on the right):
  23. Mainefossils

    Rhychonellida brachiopod id

    Fossil forum, This is another brachiopod from the Leighton Fm. It is a rhychonellid, but I am unable to identify it to the genus. I originally thought it was Rhychonella, but I see problems with this id. Any help would be appreciated. Here are some pictures of it (1-4 are internal molds, 5 is a separate specimen same species external mold) :
  24. Mainefossils

    Brachiopod id

    Fossil forum, These are specimens from the Leighton Fm. They are all located on the same block. I believe that the specimens I have taken pictures of are of the same species, but don't know what species. All the available literature I have looked at has not identified the genus. Any help with the genus, and maybe even the species, would be greatly appreciated. Here are some pictures of them (internal molds on the left, external on the right):
  25. Mainefossils

    Possible fossil coral

    Fossil forum, This is another fossil from the Leighton Fm haul. I was thinking coral, because of the external mold of it, but the internal mold has interesting segments. Unfortunately, the internal mold is missing a piece. Here are some pictures (internal mold on the left, external on the right):
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