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Found 27 results

  1. Hello Does these trilobites looks real? It's a ceratarges and a Phacops from Merakib, Morocco. The seller said there are 27 hours of work in this piece. What are your opinions? Thanks for looking
  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. I recently cleaned this Phacops trilobite for a friend in the local Gem and Mineral club. He found it last August in a quarry near Paulding, OH. Only flaw is a missing upper lip.
  4. I have by good fortune acquired a few decent Devonian Phacops trilobite specimens from the Penn Dixie Quarry in Hamburg, NY. One particular rock has a few decent Phacops embedded directly in the rock. I wanted to know what the steps are for preparing these fossils, or if I should just send them to a preparer. Please provide any advice you can. Thank you. I have a bunch of fossils and am new to the preparing process.
  5. I have a decent collection of trilobites (Phacops, Elrathia Kingi, Perenopsis) along with a new Eoredlichia that's being shipped directly from China. I also have a large assortment of sharks teeth (Bull, Sand Tiger, Tiger, Snaggletooth) from the Calvert Cliffs Maryland area, a pristine condition Ecphora (Maryland state fossil), a saltwater crocodile tooth, turritella's, quartz horned corals (W New York), porpoise teeth, shark vertebrae, dolphins bones and vertebrae fragments, and numerous other fossils.
  6. I purchased this trilobite from Colorado, I was told it is a Phacops but from what I read it seems a bit on the large side. Since I was told its from Morocco I questioned its authenticity but due to the damage I think it is real but crudely excavated. Any thoughts on this specimen would be appreciated.
  7. 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.
  8. 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!
  9. I was perusing trilobites on e-bay and came across this gem: the seller makes no bones about the fact that it is a resin cast of a Phacops mortality plate. What is interesting is the level of detail of the cast, including individual lenses on the schizochroal eyes. Most of the websites discussing trilobite fakes indicate that if you see details like terrace lines and individual eye facets, there is a very good chance that it is not a fake (at least those parts of the trilobite). This cast changes those rules, it seems. In the close-up views, you can see bubbles from the setting resin (another tell-tale sign of a resin cast). So, in watchful...the level of detail in resin casts has just gone up a notch. ---Prem
  10. From the album Gifts and boughten!

    An other add to my collection from the Rocks, Gems and fossils expo in Montreal this weekend!
  11. From the album Gifts and boughten!

    An other add to my collection from the Rocks, Gems and fossils expo in Montreal this weekend!
  12. From the album Gifts and boughten!

    An other add to my collection from the Rocks, Gems and fossils expo in Montreal this weekend!
  13. From the album Gifts and boughten!

    An other add to my collection from the Rocks, Gems and fossils expo in Montreal this weekend!
  14. From the album Gifts and boughten!

    An other add to my collection from the Rocks, Gems and fossils expo in Montreal this weekend!
  15. These are the best of the bugs I found at Penn Dixie. Highly recommend this site, especially for families!
  16. From the album Penn_Dixie_Quarry_Blasdell_New_York

    Phacops fragment(s) from the Windom Shale. Devonian.
  17. From the album Penn_Dixie_Quarry_Blasdell_New_York

    Phacops fragment(s) from the Windom Shale. Devonian.
  18. From the album Penn_Dixie_Quarry_Blasdell_New_York

    Phacops fragment(s) from the Windom Shale. Devonian.
  19. From the album Penn_Dixie_Quarry_Blasdell_New_York

    Phacops fragment(s) from the Windom Shale. Devonian.
  20. From the album Penn_Dixie_Quarry_Blasdell_New_York

    Phacops fragment(s) from the Windom Shale. Devonian. This was the best one I found that day. Rolled up in a tight ball.
  21. From the album Penn_Dixie_Quarry_Blasdell_New_York

    Phacops fragment(s) from the Windom Shale. Devonian.
  22. From the album Penn_Dixie_Quarry_Blasdell_New_York

    Phacops fragment(s) from the Windom Shale. Devonian.
  23. From the album Penn_Dixie_Quarry_Blasdell_New_York

    Phacops fragment(s) from the Windom Shale. Devonian.
  24. From the album Pictures for sharing

    A few rollers from Ontario (the flexicalymenes) and New York (the phacops)
  25. Spent a wonderful day on Sunday with my Fossil Forum Buddy Dave (Quarryman Dave) at Penn Dixie just west of Buffalo New York. After the normal hassle of getting fingerprinted at the border. We made an uneventful trip to the fossil site, although Dave did get lost at least three times trying to find the place. He only got lost once on the way back. Overall we arrived at 9:30 and left at 6:00. After a long day of splitting rock non stop we were very tired after the walk out to the car (which was past the closed gates) with buckets full of rock and equipment in hand. Met some great new people from New Jersey, you know who you are. Here's hoping we get to hunt eurypterids with you in the near future. Here is our work area for the day we created that bench and excavated about 50 square feet of surface area down about 24 inches. My estimate is that we were seeing about 4 to 5 trilos mostly partials per cubit foot we split. I suspect by the end of the day we found 50 to 60 trilobites with the potential to be complete (all but 2 phacops, I know they changed the name but I am old school) We found two that might end up being reasonably complete greenops but they are by no means perfect. The greenops tend to be in the more crumbly layer. Here is the overall group photo of what we found Here is a challenge to you , how many trilos can you see in this picture I gave up when I got to 50 A couple in here will prep up real nice. I will post pics once they are prepped. I put a few more pictures in my gallery as they don't fit here because of size restictions.