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Found 10 results

  1. 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!
  2. 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.
  3. 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.
  4. 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!
  5. Prepared and photographed by Jay A. Wollin. © 2016
  6. 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.
  7. 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!
  8. 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
  9. 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
  10. From the album Trilobites

    Here is an Eldredgeops norwoodensis from the Devonian Little Cedar Formation of Iowa.