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Found 6 results

  1. Andúril Flame of the West

    Dipleura vs Trimerus

    Hello all, In my investigation of the fauna of the Devonian Mahantango Formation, I have become quite interested in the trilobite Dipleura dekayi. I have not yet had the opportunity to encounter this bug on the field, but it’s size and strange appearance have draw my interest. From the sources that I have read regarding the Mahantango and Hamilton Group formations in Pennsylvania and New York, I have noticed that trilobites with a very similar appearance have been referred to the separate genera Dipleura and Trimerus. In Fossil Collecting in the Mid-Atlantic States, Jasper Burns seems to treat Dipleura and Trimerus as synonyms. However, Wikipedia (I am fully aware this is not the most reliable source) has separate pages for Dipleura dekayi and Trimerus dekayi. I have also heard more references to Trimerus when the specimens are found in the New York area and I vaguely remember a posting on the forum where the question of Dipleura vs. Trimerus was addressed but which post that was has escaped me. Here are the main questions that I have regarding this topic: 1.) Are Trimerus dekayi and Dipleura dekayi different valid trilobite species or are they synonyms? If they are synonyms, which would be the most proper to use? 2.) If Trimerus dekayi and Dipleura dekayi are two different valid species, how can they be differentiated? Does this depend on the region where the specimen was recovered? 3.) Are there other species of Trimerus present in the Mahantango Formation/Hamilton Group and how can they be identified and differentiated from Dipleura? Thank you in advance to all who view and comment on this post. I am very eager to learn more about Mahantango fauna and hopefully it will not be long before I find my first Dipleura/Trimerus in the field.
  2. Easwiecki

    Deep Springs Road Meetup

    I finally found something worth posting! For the first time in about a year I found enough free time to take a day off and return to Deep Springs Road quarry. I was able to meet many forum members for the first time including @Fossildude19, @Darktooth, @Jeffrey P, and a few others whose usernames escape me at the moment. It was a beautiful, warm day with a light breeze blowing innumerable fluffy cottonwood seeds hither and yon (and often in the eyes, noses, and mouths of quarrygoers). As we pulled up to the quarry around 8:30 AM @Fossildude19 and @Jeffrey P were already there, digging away. After introductions and some very valuable tips and knowledge of the quarry from the duo, I set about aimlessly splitting shale slabs from a pile recently excavated, perhaps by bulldozer. I found mostly nothing in the early morning while @Fossildude19 showered me with hash plates, curved and straight nautloids, gastropods, and other representative fauna he knew I'd be interested in. I'm very new to fossil collection and identification so apologies if I misidentify anything! @Fossildude19, @Jeffrey P, and @Darktooth were all incredibly helpful in identifying everything I brought to them. Paleozygopleura gastropods Orthonata sp. Nautiloids After a couple of hours in the dirt piles at the quarry entrance I decided to move somewhere I could cut do my own excavation in undisturbed shale. Halfway into the quarry I found a small pit where it looked like someone else had the same idea in a previous visit. As I settled into the 6 inch hole in the ground, @Darktooth and the Syracuse group arrived, and a while later a group from Pennsylvania showed up as well. The quarry was singing with the sound of metal on mineral while I chiseled into the wall of the hole I had found, eventually revealing a very nice bivalve, the name of which I can't remember. Goniophora? The crack in the shale formed after the rock sat in basement for the few days since the quarry trip, which reminds me that I should check the fossil prep section of the forum for preservation tips. I've already heard to use a dust made from grinding the matrix to fill the crack, and a mixture of superglue and acetone to help everything to stay together. Any other tips are graciously welcomed! I was getting tired of the pit after 3 or so hours and wanted to search for Eldregeops in the upper layer of the quarry. "One more layer" I told myself since I had just reached an easily splittable section. Three layers later I stumbled on my first ever complete (or nearly so) Dipleura dekayi fossil! Everything was perfect, the shale on top separated cleanly, there were no defects. I just needed to find a way to get it out without damaging it. Thankfully, @Fossildude19 came again to save the day, this time with a shale cutting handsaw! (Which I absolutely need the Make and Model for). A few seconds later my prize was free! I desperately want to prep it, I see so much detail in the cephalon alone! But when I got it home the surrounding matrix fell apart so easily, I figure it will just shatter if I try anything. Me in the pit I have many more identification pictures to take and share from this trip, but finding time is tricky right now. I wanted to get this up so that my comrades in shale splitting could share their fortune as well. A few bonus pictures: Bryozoans Partial greenops found by sister-in-law Interesting little coral I had so much fun and can't wait to get back out there again!
  3. Koopyetz

    ID please

    Found on western side of Canandaigua lake, fingerlakes region of New York. Thank you
  4. Rock-Guy-17

    More unknown Devonian/WNY fossils

    Hello again, I have some more photographs of fossil specimens that I am unsure about or looking to confirm. Appreciate the help. 1. Devonian, Genesee Formation from around Dansville, NY. Agonatite? Gastropod? 2. Also Devonian, Onondaga Formation I believe, Erie Co.. I am not great at trace classification ID beyond that it looks to be a trace burrow 3. Devonian Moscow Fm., Erie Co. The little fossils on the left side of image? Can't find any sources on these. Neat trilobite eye in the rock. 4. Rugose Coral, Devonian Livingston Co. What is the fossil attached to the coral body? 5. Irondequoit Formation I believe. Definitely from Lockport, NY. These Bryozoa or some type of coral?
  5. Peat Burns

    DSR Gastropod (?)

    This one has me stumped. I think it is the body whorl of a gastropod (DSR, Middle Devonian, Hamilton Group, Moscow Fm., Windom Shale). It is smashed, but the full circumference of the whorl is present, which means the aperture has to be on the left (which is consistent with the direction of the growth lines) (see arrow). If that is the case, there should be a shallow furrow or ridge in the center of the whorl running parallel with the cords and perpendicular to the growth lines if it were something like Mourlonia or even a Bellarophontacea. I see no evidence of such, not even on the crimped / folded / smashed edges above and below. One would think that with such distinct surface detail that this one would be easy... Any thoughts? The fossil is about 46 mm in length. Scale in mm. @Jeffrey P, @Fossildude19, @Darktooth, @Kane Here is outer side of the shell. Here is the shell flipped over to show the other side of the whorl. I think the broken area on the right is where the body whorl continued to the second whorl (which is missing). Here is both views side by side: Here is where I believe the aperture is located (I have prepped to the edge of the shell, and the shell ends there).
  6. Peat Burns

    Penn Dixie Crinoid

    Does anyone know what part of the crinoid this element is? Is there enough there to assign a genus? It is 6-sided, and each side has a concavity. Pictured are top, bottom, and one side view. Scale in mm. Location & geological context in tags.
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