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Showing results for tags 'agnostid'.
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A rangeomorph holdfast trace fossil from the Ediacara formation, Rawnsley quartzite of the Flinders Range, South Australia. This specimen is Medusina mawsoni, so called because it was until recently thought to be a jellyfish, but is now believed to be the attachment point of a fractal rangeomorph as Charniodiscus is the point of anchorage for Charnia sp. This one may have been the holdfast point for some species of Rangea. The diameter of the outer circle is 1.5 cm and the fossil is estimated to be 555 million years old.
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From the album: Purchased Trilobites of Isotelus2883
From the famed U-dig Quarry of Utah. It was a nice little specimen for not much. Wheeler shale. -
From the album: Wheeler Formation
One of nicest Elrathia specimens from my expedition out west! -
From the album: Wheeler Formation
One of my favorite finds from the Wheeler. -
From the album: Wheeler Formation
Beautiful color on this one. Photographed wet. -
Menagerie multi plate - Asaphiscus, Elrathia, Bolaspidella + Agnostids!
cameronsfossilcollection posted a gallery image in Member Collections
From the album: Wheeler Formation
This was carefully prepped out with serendipitous results, as the main attraction was always the Asaphiscus. -
From the album: Wheeler Formation
Closeup of the Asaphiscus. -
From the album: Wheeler Formation
Look at that spine! -
From the album: Wheeler Formation
There are actually four bugs on this decent sized plate! -
From the album: Wheeler Formation
This bug was either thrown into an unnatural position during the burial process or is an uncommon example of enrollment in Cambrian trilobites! -
From the album: Wheeler Formation
Puny bug! -
From the album: Wheeler Formation
Here’s a closeup of that tiny cranidium. Jon is a master prep! -
From the album: Wheeler Formation
Nice reddish brown bug! -
From the album: Wheeler Formation
Beautiful dark red Elrathia molt. That small dot to the left of the bug is a cranidium belonging to a member of the same species! -
From the album: Wheeler Formation
Two cheekless red molts on a beautiful algae covered matrix. -
From the album: Wheeler Formation
Beautiful, large molt with a tinge of green. -
From the album: Wheeler Formation
Unsurprisingly thought this was an Elrathia when I found it. -
From the album: Wheeler Formation
Cheekless red Elrathia molt on a beautiful piece of rock. -
From the album: Wheeler Formation
Typical preservation without either of the helens nor the operculum. -
Hey all, I bought this trilobite from a seller today and was wondering if anyone could help me ID it. I'm pretty sure its from Utah, and I think it's an Elrathia, but I just want to get some other thoughts or opinions. In the bottom left there seems to be part of an agnostid, but I could be wrong. The seller said that they didn't know where it came from unfortunately.
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Hello again, still going back through my neglected trilobites. This one I had labeled in my mind as Elrathia+ Agnostid fragment. After learning a little more about trilobite ontogeny (https://www.trilobites.info/ontogeny.htm) I wonder if the partial agnostid may rather be a larva of Elrathia? Or can I rule that out by size? I hope the "adult" is sufficient for scale comparison. The more you learn the less you know. Best Regards, J
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I now have 2 slabs with Agnostids: One that I found last week, and one that I bought years ago at Fernbank Museum of Natural History. You know what to do: Show 'em if ya got 'em! This is the hash slab I bought with some Agnostids and Elrathria: And this is the Barrandagnostus inexpectans that I found last week up in Chatsworth. Probably my most proud find in the Conasauga shale:
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Hello for all. It has been a while to leave a post here! I am currently in Burlington, VT as a UVM student. Before the end of the summer recess (August 18), I traveled to northern Vermont consulting some articles about Cambrian and Ordovician formation located in Highgate Falls and South Hero. In this post, I will just talk about one trip to Highgate. I left my dorm around 11 a.m., and I get the Higate Falls near 1 p.m. After straying about 3 hours, I finally realized that the outcrops described as fossiliferous in the article are located in the private land. Thanks to my student ID card, the landowners welcomed me I could not hunt fossil around the Ordovician formation (Highgate Formation; Upper Ordovician) because the cliff was really steep and seemed very dangerous. It is on the left side of the picture (Red line). So, I just focused on the right side (Yellow line) that is Gorge Formation (Upper Cambrian, Upper Sunwaptan Stage, 492-491 MYA). Below is a photo of the Gorge Formation I found some trilobites and brachiopods (not on this post), but I have no clue about their scientific name even though I checked my article... I would appreciate if you correct the wrong scientific name 1. Lotagnotus americanus Billings, 1860 2. Geragnostus ( Micragnostus ) bisectus (Matthew, 1892) (Shaw, A. B. (1951). The Paleontology of Northwestern Vermont. 1. New Late Cambrian Trilobites. Journal of Paleontology, Vol.25, No.1, pp.97-114.) 3. Librigena.
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Well, i thought I'd show my primitive prepping skills. This is all rather unnecessary as Tony @ynothas already done this thread here and probably better and the pieces shown were kindly donated to me as well. So treat this as a repeat of what Tony does better. Hey ho. So these are the three pieces that Kind Tony sent me. 1. Notice this Elrathia kingii (1.2 cm long) has a break on the anterior margin (cause of death?) .and an upside down Itagnostus interstrictus (5.5 mm) above it and a piece of another to the right of it. 2. This Elrathia (1.8 cm long) has another ones cephalon stuck to its cephalon and some serious damage on the right side pleura. 3. This one is upside down in the matrix. (2.3 cm long) All my prepping was done balancing the specimens on my knee and using a jeweller's loupe to see and a board pin to do the actual prepping. Some water and saliva were also involved, but that was all. First I carefully cleaned as much of the matrix off the first two specimens as i could using the pin and then dug around the third piece so I could 'pop' it out of the matrix. Then I dug all around the other two specimens with the pin and popped them out of the matrix. Here is the third one popped out and with a bit of prep already completed. Sorry for the dreadful photo, but wifey and her camera phone weren't about so i started prepping and then took this photo with my computer as i was impatient to continue. When it was first popped only a tiny bit of the glabella was showing clear of matrix. Here i have popped the Itagnostus before popping the Elrathia.
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I found a few lists of trilobite species from Utah, but am having trouble finding any information on telling the Agnostid species apart. Looking for some sort of papers, book, illustrations, pictures or something that can help me make sense of the differences between, say, Baltagnostus eurypyx, Itagnostus interstricta, Peronopsis interstricta, and etc. Thanks!
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