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Found 24 results

  1. Thaleops? Cephalon?

    Found this one in Bowmanville (Mid Ordovician, Cobourg? Formation) last weekend. My best guess is Thaleops laurentiana cephalon but id like to have a better idea what it is before I attempt any more prep. Have not tried yet but probing with air abrasion looks like it will be difficult since the matrix is full of calcite or some other crystals. @Malcolmt @Kane @Northern Sharks
  2. From the album Finds From the Ordovician -488 to 443 MYA-

    From the Collingwood member of the Lindsay (Cobourg) Fm.
  3. paleobiology of arthropoda:phyllocarida

    ARCHAEOSTRACAN (PHYLLOCARIDA: ARCHAEOSTRACA) ANTENNULAE AND ANTENNAE: SEXUAL DIMORPHISM IN EARLY MALACOSTRACANS AND CERATIOCARIS M’COY, 1849 AS A POSSIBLE STEM EUMALACOSTRACAN Wade T. Jones , Rodney M. Feldmann, and Donald G. Mikulic JOURNAL OF CRUSTACEAN BIOLOGY, 35(2), 191-201, 2015 wadefeldpaleozphylljcb0191.pdf
  4. More trilo-bits

    Still just finding bits. Two pygidia in one piece, and a small cephalon. This entire area must have been a shell pile like you see at the beach today. You know, the ones you have to walk around when bare footed. Nothing but shells, bits n' pieces. Cheers.
  5. Dipleura Cephalon ?

    Hi folks. I cracked into some very nice bryozoans today. Mostly the fenestella (?) and also see this item that looks like the upturned nose of a dipleura. Do you see the same ? Will post some pics of the bryozoans in the general section. Thanks.
  6. About a month ago, I headed out on two fossil trips to the well-known St. Leon roadcut in Indiana. I was hunting in the Liberty formation (late Ordovician) with the sole goal of finding some nice trilobites (which I definitely achieved!). Along with multiple rare trilobites, I was able to find some excellent examples of other fossils. The spoils were totally awesome, and I am itching to go back. I hope you enjoy. Best for last.
  7. Eyeing up the paleozoic

    Torn this being Clare Torney's thesis:Mineral eyes:lessons from the natural world Also some consideration is given to echinoderm eyes HIGHLY recommended,a paleobiological gem,but other won't necessarily agree NB: two parts of this thesis may be found in Piranha's "Open Acces trilobite papers" Mustread for those following the exploits of Euan Clarkson,Horvath,etc about 17 mB The considerations given to mineralogy and diagenesis(GOOD petrogrpay!) are priceless,but then again,that's just me also tasty(outtakes below,Ca. 2013/Paleontology preprint)
  8. inflated

    What does it mean for a fossil to be "inflated"?
  9. Agnostids

    From the album Adam's Cambrian

    Agnostid Trilobite Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Agnostida Family: Ptychagnostidae Genus: Ptychagnostus Species: gibbus Author Citation Linnarsson 1869 Geological Time Scale Eon: Phanerozoic Era: Paleozoic Period: Cambrian Epoch: Middle Stratigraphy St Davids Sediments Biostratigraphy Paradoxides Series Provenance Acquired by: Purchase/Trade Location Road cutting, 300 m S.W. of Cement works. Slammerstad, Oslo Norway Listed as St.David's, Paradoxides Series. About 505 million years old.
  10. nothing groundbreaking,nothing new

    olenid cephalon(source indicated,after a fashion)
  11. Cephalon from Ogilvie Mtns.

    Here's one of the head shields from the same location , which I don't think has any relation to the previously posted spiny pygidium ... This is the only type of cephalon I've recovered from that spot.
  12. Trilobite cephalon and pygidium

    Hi folks. At first glance, I labeled this cephalon an Eldredgeops but it doesn't compare well with other examples in the area behind the eye where the "dimples" are. There is also a sort of "horn" projecting from the upper rear portion of the eye. Just not certain about this one. Could just be deformation ? Then the nice size greenops pygidium. Wow, I'd love to find a complete one this size ! Thanks, Regards.
  13. Trilobite cephalon, Eldredgeops ? or ?

    Hi folks. Unlucky break, I hate it when that happens ! This chunk broke out in a bad way. I'm pretty sure it is a portion of a trilobite cephalon but it doesn't look like the other eldredgeops that I've found here. Not certain which is fwd or rwd, but the taper of the "center section" appears to be in the wrong direction compared to my other specimens. Perhaps it is squashed/deformed a bit ? Something just doesn't look right about it to me. Any clarification would be appreciated. Thanks.
  14. 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.
  15. Trilobite cephalon # 7

    Beginning to recognize more of the minor details. A small portion of the eye was protruding from the surface a fresh split. A bit of scratching under the microscope revealed my favorite so far. I call it #7. OK, ...... I'm hooked ! Thanks again folks.
  16. The Mysterious Cheirurus

    The fossil(s) in question here were collected during the summer of 2016 from the Liston Creek Limestone (Silurian) in northern Indiana. I am using them for my senior thesis project in which I'll be comparing Ordovician trilobites with Silurian Trilobites. Anyways, I have been taking a scientific illustration class during the month of May and for my final project I decided to do a stippled illustration of one of the Cheirurus cephalons I collected in 2016 (in total i have about 7 cephalons of varying sizes, all with identical morphological characteristics). I've been trying to narrow this particular specimen down to the species level since I plan include the binomial nomenclature on my final illustration. After a days worth of researching I'm still unable to confidently identify the specimen at the species level. The literature I have on the rock formation this specimen comes from lists Cheirurus niagarensis among the common fauna. From what I've seen online, I don't think my specimen is C. niagarensis. Two other possibilities I've noted are; C. infensus, and C. insignis... So far those are the only 3 Cheirurus species that resemble my specimen the closest, but I'm still not confident in any one of them in particular. As fossil ID information is notoriously hard to find on the internet I've decided to post some pics of my specimen on here to see if anyone can help me to ID it. The first 5 pics are of the specimen I'm using for my illustration. The 6th picture is of the previously mentioned specimen (right) and a larger specimen (left).
  17. Made a short and first of the season visit to one of my honey holes. It is mostly large piles of regional riprap (a majority of it Dundee Fm). Although there isn't much of this specimen left in terms of the impression, the cephalon below the pygidium is throwing me. In this particular type of rock, I do find Proetus pygidia, which is why I'm leaning toward that as an ID. That being said, the border around the cephalon is making me second guess if it is perhaps a Dechenella. If I recall correctly, both species have a fairly distinct genal spine (but Proetus having a more blunted one). scratch that... it just may be another plain old Elderedgeops rana
  18. Hello y'all fossil heads!! Is there anyone out there that can help me obtain a good recognisable DALMANITE trilobite HEAD? Doesnt have to be mint or even complete as long as at least one eye is visible I gladly trade :-) Hope someone can help me out Cheers Pat
  19. Quickisode: Trilobite Anatomy

    Hey everyone, I thought that I would talk about trilobite anatomy. I have been using some complicated terms, and I want to make sure that we are all on the same page. So please watch the movie and enjoy!
  20. 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!
  21. B19

    From the album Marjum Formation

    Bathyuriscus Cephalon, missing free cheeks about 3.5cm wide. Marjum Formation, Mid-Cambrian, outside Delta Utah.

    © ©2016 Zach Case

  22. Guangweicaris spinatus

    From the album Anomalocaris and friends.

    The cephalon and part of the thorax of the Guangweicaris spinatus from the Guanshan Fauna (Lower Cambrian, 520-525myo).
  23. Is there a way to recognize the Olenellus subspecies by looking at the cephalons only? -Arild
  24. Fossils of the Gull River Formation, Black River Group This past weekend I came across a newly excavated site here in Kingston, Ontario. After spending a few hours over a few days here is what I collected. Cephelopod - Gull River Formation of the Black River Group, Kingston, Ontario 4.75" x (0.5" to 0.3") Conulariid - 0.75" x 0.5" - Gull River Formation of the Black River Group, Kingston, Ontario Thank you to Peter Lee and Nathan Thomas for identifying this for me. (Daimanella) - Brachiopod - Gull River Formation of the Black River Group, Kingston, Ontario 1.2" x 0.75" (Ceraurus Cephalon) Trilobite - Gull River Formation of the Black River Group, Kingston, Ontario 1" x 0.75" (Species Unidentifed Yet) Trilobite - Gull River Formation of the Black River Group, Kingston, Ontario 0.25" x 0.125" Collected several other specimens that I have not photographed. One in particular, an isotelus pygidium, that I still need to photograph. I'm always wanting to make sure I have the right species names. If you know of an error please let me know. I have been learning a lot from everyone on this forum. THANK YOU
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