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Found 27 results

  1. Trilobit, Silica Shale

    This might be a job for @piranha This trilobit looks a little different to me than the typical Eldredgeops. Maybe Dechenella lucasensis? I didn't realize how poor the photo quality was until I cropped it. I can take more photos under the scope if necessary. Silica Shale, middle Devonian (Givetian), Paulding, Ohio. Scale in cm/mm. This one seemed different as well.
  2. Today I took a trip to a much underrated fossil site, Briggs Road, in Earlville New York. For those who don't know Briggs is only a couple miles North from the much talked about Deep Springs site. I had been wanting to get back to the trilo layer here as this is a great spot for Eldredgeops rana But this road is a seasonal use road so when it snows they only plow until the last house before the site and leave a big pile of snow blocking the road. Finally after a few days of warmth the snow pile was gone. The rock here is quite weathered right now and all I used was a small pry bar to help break off pieces from the main wall. My older son David had rehearsal for an upcoming play at school. So only Dylan and Devin were with me. Me and Dylan did the most searching while Devin was just being a boy. Throwing rocks and ice into the small pond that formed in the quarry was his thing today. We found tons of cephalons and pygidiums. I found a nice almost complete prone trilo in the rubble pile that I thought was whole. I was very sad when I saw that most of the left side was gone. I did find one small complete roller in matrix and a few that may be wholebut will require prep to fi d out for sure. Dylan seemed pretty content as he found more trilo parts then he ever has before. We stayed for about 3 hours. I wanted to stay longer but I promised them we would only be there a couple hours and I didn't want to push it. Here is some of our finds.
  3. Eldredgeops iowensis

    From the album Trilobites

    Eldredgeops iowensis. Hungry Hollow Mbr
  4. From the album Trilobites

    Eldredgeops rana Enrolled. Found at Penn Dixie, prepared in October.
  5. Eldredgeops rana

    All I can say to this fine specimen is "Wow!" @Malcolmt thank you so much for restoring and preparing this prone Eldredgeops rana. Here is a before and after.
  6. Pleura ? Eldredgeops ?

    Devonian, Mahantango fm., Eastern WV. (average size thumb) Not much here to go on. I barely saw the edge of it so I dug it out ... just to see that it went nowhere. By comparing photos, it looks like a single pleura from an eldredgeops trilobite. Am I close ? If it is, its the first one I've seen here among quite a number of cephalons and pygidia. Been very busy with work, hope to get a chance to look around a bit toward the weekend. Cheers.
  7. Eldredgeops

    From the album Trilobites

    Taxonomy: Eldredgeops rana Age: Middle Devonian (Windom Mbr) Location: Penn Dixie (Hamburg, NY) Source: self-collected Prepared by Malcolm Thornley.
  8. Eldredgeops

    From the album Trilobites

    Taxonomy: Eldredgeops rana Age: Middle Devonian (Windom Mbr) Location: Penn Dixie (Hamburg, NY) Source: self-collected Prepared by Malcolm Thornley.
  9. Eldredgeops rana

    From the album Trilobites

    Taxonomy: Eldredgeops rana Age: Middle Devonian (Windom Mbr) Location: Penn Dixie (Hamburg, NY) Source: self-collected Prepared by Malcolm Thornley.
  10. Trilobite Trio

    Hi group, I think this is another greenops pygidium. If it is, this make a Trilo-Trio, all three species found within inches of one another. The Eldredgeops was peeking out of a natural fracture and looked like it might possibly be more than just a cephalon ..... but, no luck. Only had about ten minutes to look today, hope to get a chance to look more tomorrow. Devonian, Mahantango from eastern WV. Kind regards.
  11. Hi folks, just back from vacation. Realizing more what to look for, I found 5 more pygidia today as well as this little beauty which was in a piece of shale beside the road at the end of my driveway. I picked it up on my way back from the mailbox as it looked promising. This is trilobite (bit) #15 and replaces #7 as my new favorite. I really dig those eyes ! Just one eye was exposed and there was plenty of matrix there to contain the entire trilobite, but sadly after taking great care (and time) to scratch down to the body, there was only a cephalon. I was so hoping this was a complete one. Will keep looking, and hoping. Thanks for looking, Cheers.
  12. Well I'm on my way to Utah for a new career opportunity and looked up the LaFarge quarry in Paulding Co. last night. This quarry is supplied with dump trucks worth of shale from the LaFarge quarry that pulls directly from the Silica Shale formation Devonian era. The location is in the middle of nowhere and my wife gave me one hour to look around. Soon I had my five month old daughter, Clara, strapped to my chest in a baby carrier and I was quickly scrounging around looking for fossils. I can tell you that I was not disappointed though I did not locate a complete Eldredgeops roller I did walk away with some very large brachiopods and the largest horned coral I've ever collected. To anyone seeking to collect fossils in the mid-west or Ohio, this location is a must. All this came out in under an hour of searching and some of these pieces could look good after some light preparation. See descriptions below: This place is in the middle-of-nowhere Ohio. The parking lot was gravel with a portable outhouse. The nearest gas station was about twenty minutes away. I was talking to @Kane about conglomerates of fossil bits and he noted similar compositions at both Penn Dixie and Arkona. I know there's a scientific term for what this occurrence is but I can't seem to recall the word at this time. Regardless I find these settings interesting as they don't seem to preserve anything exceptional, certainly not a complete trilobite but it's neat to see so much life in one piece of sedimentary rock. This particular rock is full of pieces of bryozoans, crinoids, trilobites, and brachiopods. Someday I'll invest in an expensive microscope to examine these different pieces. I usually don't keep horned coral but I couldn't resist keeping this one. The interior calcium based structures have crystalized and it is by far the largest horned coral I've ever picked up or seen in person though they can get bigger. There were Eldredgeop cephalons and pygidiums everywhere. Similar to Penn Dixie this is a really good sign that potential complete pieces, particularly rollers are present. I believe the terms of the site are that tools such as hammers and chisels are not allowed as the shale pieces are small and brittle enough to break in hand. I believe that a few years ago access to the official LaFarge quarry was granted but that was recently retracted and a number of amateur paleontologists wrote letters to the company requesting something be done to continue to provide access to the site. I'm really glad LaFarge goes out of their way to dump some scraps for people to pick through. Site admission is free and you can keep whatever you find. Large piece of an Eldredgeops segment sticking out of the matrix surrounded by brachiopod pieces. What a scene this must have been during the Devonian. The camera doesn't do this pyritized piece of shale justice. Hopefully I'll be able to take some micro pictures later of the square crystals. One of the larger Eldredgeops pygidiums I've ever seen and I read some sources last night that the trilobites in the Silica Shale can be very large. Almost every trilobite piece I came across at the site was very large. This pygidium is almost an inch wide. There were many spiriferid strewn throughout the site. Most had both halves and exhibited excellent color. Large cephalon. More pyrite. The large horn coral. More pyrite amidst a conglomerate of fossil pieces. A complete brachiopod out of the matrix. Front view of the brachiopod. I'll have to ID this one after some cleanup and polish. I really like the color on the corals and fossils at the site. This is a light tan. Another large complete brachiopod. A long spiriferid with what appears to be both halves. This one should prep out nicely. The desert of farms and trees of western Ohio. Corn, trees, and farms all around. Another good sized Eldredgeops cephalon. Yet another horn. Large Eldredgeops cephalon poking out. Not complete but gives me hope that there might be some complete specimens at the site.
  13. IMG_3124.JPG

    From the album Trilobites

    Taxonomy: Eldredgeops rana (assortment - prone, semi-prone, enrolled) Age: Middle Devonian Location: (various: NY, Ontario) Source: Field collection Note: By far, the most abundantly common, and recognizable, trilobite of the Devonian. Over the years, I've probably amassed a ridiculous number of them.
  14. I just spent the past few days digging up some neat Devonian-era fossils from the Penn Dixie Hamburg, New York site and have two Greenops and 10 Eldredgeops that need prepped. Would anyone out there be willing to prepare these fossils for either a fee or for some of the spoils? I have a lot of high quality Eldredgeops, cephalopods, bryozoans, and crinoids that I could give up in exchange for the fossil preparations. I also have a bunch of shark teeth from Calvert Cliffs along with some neat shells (Turitella and Ecphora). Send me a personal message if you're up to the task or respond if you have any referrals.
  15. Blasdell/Hamburg NY Part 2

    Found some amazing stuff today with @Kane @ischua @DevonianDigger @Fossildude19 and @drobare We hauled some serious rock and had somewhat of an assembly line going with splitting and processing the pieces. It was a really solid day all around and everyone walked away with some sweet finds. The following is a sample of some of the cool stuff I've found. The rest is packed away. The first is a large cephalon and will look good despite not having a body and then there's a Spyroceras cephalopod that might benefit from some very gentle prep work. I really like cephalopods because of all the neat chambers they contain.
  16. Blasdell/Hamburg NY

    @DevonianDigger found this beauty before @Kane could get to it! @Kaneworked hard to dig this slab out but @DevonianDigger cracked the slab open before he could! Hence the new phrase (after his name) is: You've been Jayed! @DevonianDigger didn't even know it was from his pile. What a find!
  17. So, in my previous post, "Day One In The New Workshop", I had posted a pic of a plate that I had hoped would be an Eldredgeops rana mass mortality plate. I decided to do some work on it to see if there were any more than the two hiding in the matrix. Apparently the rest of the trilobites opted for the blue pill. Turns out there was just the two, one enrolled, one prone, and neither 100% complete. There was also a nice little piece of what would appear to be Streptelasma ungula coral. I have been asked several times to "blog" about my prep work as I go. In an attempt to abide, I am going to try and share as I go with this piece and others! So, after some initial prep, it looked a little better. Once I determined that these little fellas were not with friends, I used my Dremel engraver to rough out and shape the surrounding matrix. I did, at one point, accidentally pop the lentil-sized roller off of the matrix. Thankfully, I had the foresight to hold down the actual fossils with my thumb as I was working around them, thus denying him the opportunity to experience flight. In the above picture you can see that I started to smooth out the rough cuts surrounding them. I did this with my secret weapon, the tattoo machine with a 7RL needle. As you can see in the final picture from the day (above), I started to prep out the coral and continued to contour around the "bases" of the two bugs. You can also see that the roller has a squished head, and that there is a small piece missing from the right eye of the prone. (As I mentioned earlier, neither of the two were in perfect shape to begin with.) In my next post for this one, I will show the surrounding matrix contoured out and hopefully more detail on the buglets. This is proving to be a tricky prep as they are tiny! (See below) Next time, I will try to get more "step-by-step" pictures to walk through the entire process!
  18. First Day In The New Workshop

    Just spent the first morning in the new workshop playing with some bugs. Thought I would share day 1 progress. Eldredgeops rana after first prep session. Greenops boothi after some basic prep. Missing the cranidium and left librigena unfortunately. Tiny little Eldredgeops rana, with another little cephalon in association. Thinking this one has the potential to be a nice multi. Usually when I find these tiny little fellas this close together it's a mass mortality.
  19. Penn Dixie 11/2/2016

    Hit up the site again today with @ischua, found a lot of trilobites. Mike was lucky enough to land a plate with two complete, prone Eldredgeops rana overlapping. Gorgeous piece, hoping he'll post pics when he's able. In the meantime, I started to prep out some of my completes that I found including this fella, which I am very proud of: I know, I know... doesn't seem all that impressive of a prep job... That is until you see this: Still could use a little more work but I need a finer abrasive first. Also, needs a coating, I just painted him with some water to make him shiny for his photo debut!
  20. Eldredgeops rana

    Prepared and photographed by Jay A. Wollin. © 2016
  21. E. rana 9/2016

    I was posting these pictures in a previous thread from my first cephalon that I prepped myself. I started this little guy as a practice piece until I suddenly discovered he had a complete body hiding in the rock. I've been uploading pictures step-by-step as I work on it. Figured I would share them as a separate topic.
  22. First Prepped Trilo-bit

    Have a nice ~2cm wide E. rana cephalon from the Penn Dixie site (~42.778860, ~-78.832180) that I collected earlier this summer. I have been practicing prepping trilo-bits and wanted to share my first "finished" result. There are still a few tiny places where I could've probably gotten a little more of the matrix out, but I went for 'better safe than sorry' given my low-grade equipment. Open to advice and/or suggestions!
  23. Penn Dixie Site - May 2016

    Here is a smattering of my finds from May 2016 up until last week! Good season already! I don't own an air eraser yet so I haven't done any detail prep work on anything yet. Small enrolled Eldredgeops
  24. I have been meaning to do this little experiment for some time. Normally an essentially complete trilobite from Penn Dixie in upstate New York will take me about 30 to 40 minutes to prep. Prepping one of these is relatively easy and generally gives decent results. The dark black trilo against the grey matrix always comes out nice.These trilos (eldredgeops) are about as common as I can collect and I probably have hundreds in buckets that might get prepped someday. So for the experiment I took a trilobite that was essentially complete and substantially covered with matrix. This was an extremely inflated specimen that just had a couple of defects in a few pleura. The experiment was to prep the trilo from starting to end using only the best techniques that I would generally reserve for a much better specimen than this one. The normal 30 - 40 minute prep would look something like this all done under a scope at about 7x magnification using a Comco MB1000 air abrasion unit Air scribe using an ARO till trilo is pretty much exposed Any remaining air scribing with a Pferd using fine stylus Initial air abrasion using a .040 nozzle and 80 micron dolomite Bulk air abrasion using .030 nozzle and 80 micron dolomite Final air abrasion and clean up using .018 nozzle and 40 micron dolomite The Experimental Prep All prep done under a scope at up to 40x magnification For this one air scribing was limited to using the Pferd with a fine stylus All air abrasion was done with .015 and .010 nozzles using sub 40 micron dolomite Max PSI used was 18 PSI and went as low as 3 PSI in the eye area under 40x magnification The difference It too 6 hours from start to finish and I think it looks fairly decent. Actually still needs a bit of cleaning with a fine toothbrush to get out a few bits of fine dolomite powder in the crevices... Note there is no restoration or repairs of any kind on this trilo. Has a nice pyritized burrow off to one side going under the trilo. Not the best photography here just with my cell phone... 2nd and 3rd pleura damaged on this side as well
  25. The popular collected trilobite Phacops rana is well embedded in literature for over a hundred years. Then in 1990 it was renamed Eldredgeops rana. A lot of collectors did not understand why the name change and I would like to attempt to clarify why the change. The purpose of this post is to point out the differences I have observed between Phacops and Eldredgeops and explain why "rana" is an Eldredgeops and not a Phacops. The literature on phacopid systematics is in a mild state of disarray. Authors have built on the errors of previous authors. There is no good English diagnostic description of Phacops based on the type species of P. latifrons. This has resulted in different English definitions of Phacops and causing much confusion. I'll first start with a review of what are the types and where they come from. Types: 1. Phacops Emmrich (1839) described the genus Phacops based on the species Calymmene latifrons Bronn, 1825 from the Middle Devonian (Eifelian Junkerberg Formation), Gerolstein, Germany. Because the holotype has been lost, it has not been clear what to base the diagnosis of Phacops on over many years. Then Struve (1982) illustrated topotype material but it was Basse (2006) who designated the neotype of Phacops latifrons. Now there is a definitive specimen to base the description of Phacops on. I have been fortunate to have traded for a topotype cephalon of Phacops latifrons Definition of topotype - a specimen of a species collected at the locality at which the original type was obtained 2. Eldredgeops Stewart (1927) described Phacops rana milleri from the Middle Devonian (Givetian Silica Shale), Sylvania, Ohio. Struve (1990) designated Phacops rana milleri the type species of Eldredgeops. I believe the different subspecies of Phacops rana described by Eldredge (1972) are different species and are assigned to Eldredgeops. I will to refer to these different species Eldredgeops as the "rana group" as a way to simplify the naming of all the different species. Observed different characters: I do not know what are the diagnostic generic features of Phacops or Eldredgeops. All I'm doing is listing some of the differences I have observed between these two trilobites to show they are different genera. Pictures of Phacops latifrons and Eldredgeops milleri are below for comparison with numbers pointing to the different features. Pictures of Eldredgeops rana from New York are also included so one can compare the two species of Eldredgeops and see how they differ. Now for the first time a topotype specimen of Phacops latifrons is compared with a topotype specimen of Eldredgeops milleri. There is no place in the literature where this is done. 1) marginulation - a raised ridge along the ventral margin of the cephalon. It is present in the "rana group" and absent in P. latifrons. It has been used by Flick and Struve (1984) as a diagnostic feature for their tribe Geesopini. Note: The value of this feature for the tribe has been questioned. McKellar and Chatterton (2009) state "This feature has never really been evaluated from a phylogenetic standpoint" 2) The post ocular ridge is prominent in P. latifrons and is absent in the "rana group" 3) The palpebral area is smaller in P. latifrons than in the "rana group" 4) The palpebral lobe is smaller in P. latifrons than in the "rana group" 5) The number of eye files in the "rana group" ranges from 15-18. E. milleri has 18 and E. rana has 17. In P. latifrons the number of eye files is 14-15. The topotype specimen has15 files with a maximum number of 5 lenes. 6) The maximum number of lenes in P. latifrons is between 4-5; E. milleri has 8-9; E. crassituberculata has 6 or less; E. rana 6 Note: Both P. latifrons and E. norwoodensis from the Cedar Vally Formation have the same number of files (15) in the eye. One might determine that this would result in the palpebral lobe being the same size but this does not happen. P. latifrons is smaller than E. norwoodensis. So there is some other factor affecting the size of the palpebral lobe. 7) The subocular pad is present in P. latifrons and absent in the "rana group" 8) The glabella is inflated and its front wall varies from vertical to slightly overhanging the anterior border in the "rana group" and is not as inflated in P. latifrons 9) Lateral preoccipital lobe is round in P. latifrons and is rectangular in Eldredgeops. To summarize the differences: Eldredgeops is marginulated, has an inflated glabella, a rectangular lateral preoccipital lobe, the palpebral area and palpebral lobe and larger than P. latifrons, and does not have a post ocular ridge and subocular pad. Phacops latifrons is not marginulated and the glabella is not inflated, has a post ocular ridge and a subocular pad and a round lateral preoccipital lobe. the palpebral area and palpebral lobe are smaller than Eldredgeops. Other observations: These two genera occur in different time periods. Phacops latifrons is in Middle Devonian Eifelian and Eldredgeops milleri is in the Middle Devonian Givetian It appears all the phacopid of North America disappear at the end of the Eifelian and Eldredgeops migrates from the Old World fauna into North America in the Givetian. Eldredgeops does not evolve from any North American phacopid. Eldredgeops is in the Tribe Geesopini and all the genera of this tribe have not been validated. If these genera are reexamined, it is possible that Eldredgeops could become a junior objective synonym of an another genus in the Tribe Geesopini. Hopefully, now collectors will understand the differences between Phacops and Eldredgeops and why the "rana" group is now referred to as Eldredgeops.