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Showing results for tags 'cambrian'.
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From the album: Northern's Trilobites
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From the album: Northern's Trilobites
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From the album: Northern's Trilobites
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From the album: Trilobites
Wheeler Formation Millard County Utah, United States© 2018 by Jay A. Wollin
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From the album: Trilobites
Wheeler Formation Millard County Utah, United States© 2018 by Jay A. Wollin
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From the album: Trilobites
Wheeler Formation Millard County Utah, United States© 2018 by Jay A. Wollin
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From the album: Trilobites
© © 2018 by Jay A. Wollin
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In 2005, I was in the Wellsville mountains of Utah looking for Trilobites. I really wanted a Zacanthoides grabaui but would have settled for any bug. This particular Trilobite seems so sleek and streamlined that I loved its design. If I can't own one, I can at least draw one for myself. Done on textured paper with 2B and 4B pencils.
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- 4
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- cambrian
- spence shale
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Half-Billion-Year-Old Fossil Brains Found in Ancient Predator
Heteromorph posted a topic in Fossil News
“The new discovery sheds light on the evolution of insect and crustacean nervous systems.” https://news.nationalgeographic.com/2018/03/fossil-brain-kerygmachela-tardigrade-insects/- 4 replies
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- 6
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- anomolocarid
- cambrian
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Taxonomy from Parsley & Zhao 2006. Diagnosis for the genus and species from Parsley & Zhao 2006, p. 1065: "Gogiid with at least three series of near equidimensional, essentially hexagonal plates developed directly under apical ambulacrum and two series of elongated transitional plates between them and first holdfast plates in small juveniles (TH <3 mm). Larger juveniles and mature specimens irregularly plated because of subsequent plate intercalation. Thecal plates comprising basal part of theca irregular and similar to plates of holdfast except that they have sutural pores. Ambulacral area restricted to upper thecal surface and arranged in 2-1-2 pattern except in early juveniles where pattern is 2-2. Depending on ontogenetic stage, straight brachioles number 4, 5, 10, or 15. Cover plates unusually tall. Holdfast variable in length and composed of numerous bossed platelets. Attachment disk slightly expanded and composed of several layers of small platelets." Identified by oilshale. References: Parsley, R. & Zhao, Y. (2006) Long Stalked Eocrinoids in the Basal Middle Cambrian Kaili Biota, Taijiang County, Guizhou Province, China. Journal of Paleontology Vol. 80, No. 6, pp. 1058-1071. Lin, J.-P., Ausich, W. & Zhao, J.-L. (2008) Settling strategy of stalked echinoderms from the Kaili Biota (middle Cambrian), Guizhou Province, South China. Palaeogeography Palaeoclimatology Palaeoecology 258(3):213-221.
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http://www.iflscience.com/plants-and-animals/earliest-evidence-of-parental-care-found-in-520-millionyearold-fossil/
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- 5
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- arthropods
- cambrian
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References: Wang, H., Zhang, Z., Holmer, L. (2014) Oldest glosselline linguliform brachiopod with soft parts from the Lower Cambrian of Yunnan, Southern China. GFF, 136(4): 539-547 http://dx.doi.org/10.1080/11035897.2014.914969
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- 1
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- brachiopod
- cambrian
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References: Sun, Weiguo and Hou Xianguang. (1987). Early Cambrian medusae from Chengjiang, Yunnan, China. Acta Palaeontologica Sinica 26:257–271. Jun-Yuan Chen, Di-Ying Huang and Shou-Hwa Chuang Journal of Paleontology Vol. 81, No. 1 (Jan., 2007), pp. 38-47 YUGAN, J. and HUAYU, W. (1992), Revision of the Lower Cambrian brachiopod Heliomedusa Sun & Hou, 1987. Lethaia, 25: 35–49. doi:10.1111/j.1502-3931.1992.tb01790.x
- 1 comment
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- 1
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- brachiopod
- cambrian
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Measurement is for the straightened-out individual (middle portions of which are missing)
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Hi there! I picked up this fossil while trilobite hunting over the summer along the continental divide in Montana. I keep looking at it and my curiosity is getting the better of me. I don't know if it is a trace fossil or a plant or something else. All I know is its not a trilobite. Maybe related to a stalked echinoderm or a crinoid, unfortunately I haven't found any applicable literature. This was found loose among various trilobite fragments at the base of Dearborn Limestone cliffs with Pagoda Limestone, Pentagon Shale and Steamboat Limestone above so this should be Middle Cambrian. The intriguing aspect to this fossil is the seemingly segmented appendages stemming from a central stalk. I am just another novice collector who enjoys all aspects of the natural world with limited geology experience but I more fossil hunts planned. Thanks for looking, jj
- 28 replies
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- cambrian
- continental divide
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A Fossil Forum friend sent me a few Georgia rocks to split. They were full of trilobites and bits. I believe these are all Aphelaspis brachyphasis but I understand this site has other species as seen in this information : Locality 1 is an outcrop in Murray County. The matrix is mudstone and the researchers report “very abundant specimens” of Aphelaspis brachyphasis often as body clusters. Locality 1, Murray County: Agnostus inexpectans Aspidagnostus rugosus Glyptagnostus reticulatus Aphelaspis brachyphasis ; Could any knowledgeable person verify the identities of these trilobites. As I said , it seems like they are all A. brachyphasis but the HUGE size differences to the trilobites leave me wondering whether I am missing something. Thanks.
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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.
- 18 replies
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- 2
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- agnostid
- antelope springs
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HI all, Were going through our cambrian material from the Upper Cambrian Abrigo formation from southern Arizona, and besides hordes of trilobite bits, we have found two similar calcified items in the limestones which we are not certain of. I think they are either plates from an eocrinoid, or sclerites from some sort of bottom dwelling crawly thing. Now we do very occasionally find stem ossicles here, very rare in the upper cambrian, but dont know if they are crinoid or other stemmed pelmatozoan. Here is the photos I just took, let me know your thoughts!
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Hey, does anyone know what this is? I got it in my rock collection from a lady down the street. It was her dads and he had identified it as a trilobite from New York state, but I'm suspicious as to if it is actually a trilobite. I looked it up, but I couldn't find anything. It also doesn't appear to have legs, which I'm pretty sure that trilobites have legs. It looks like an anomalocarid to me. Does anyone know what this is?
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I was splitting up some Conasauga Formation shale from the Chatsworth area exposure @Nimravis and @MeargleSchmearglhave been posting about recently. This was material I brought back 2 or 3 years ago and have had sitting around. I found numerous specimens of the usual Aphelaspis the site is noted for. Then I split a small piece and here's what popped out: Four complete Agnostus inexpectans agnostid trilobites!! Talk about "inexpected", it's hard to find one of these complete much less four on the same piece of shale. Some other views: Don
- 25 replies
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- 11
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- agnostus inexpectans
- aphelaspis zone
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The photo below shows a section of a small piece of Cambrian material from Kinnekulle, Sweden which I recently acquired. The material is, I believe, anthroconite or orsten (limestone) found in lenses in Alum Shale. The disarticulated trilobite shields that populate the surface are from the tiny Agnostus pisiformis. My question is this: What is the very thin white layer that covers parts of the trilobites - both the pieces where the dorsal/convex side of the shell is exposed and where the ventral/concave side of the shell is exposed? Any ideas would be much appreciated.
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A new interesting find from the British Columbia http://vancouversun.com/pmn/news-pmn/canada-news-pmn/new-508-year-old-bristle-worm-found-at-burgess-shale-fossil-site-in-b-c/wcm/8c7c82f4-dd88-4bb4-ba99-e8cd44e9f176
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Again, it's small enough that pics are tricky to get with my phone. I've posted the interesting side, the side, and the flip side. What do you think?
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Hi all, Winter is the perfect time of the year to collect cambrian fossils in South Eastern Arizona. Its temperatures are perfect, its not raining and traffic is low. We will have lots of material to cover here, but I thought Id start off by posting a few shots of tiny inarticulate brachs from tonights scope shooting session. I used photoshops "contact sheet" function and it worked pretty good. The Abrigo is middle cambrian and upper cambrian. The lower part is the same age (and ocean) as the Bright Angel Shale in northern Arizona. The upper Abrigo is upper Cambrian and is a latter period which is not represented in the BAS. I wont be identifying these at this point, but they are probably Lingulella or Billinslella sp. Oh isnt the Cambrian FUN?!
- 6 replies
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- abrigo limestone
- arizona
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New Stalked Filter Feeder from Spence Shale, Antimony Canyon, northern Utah
Oxytropidoceras posted a topic in Fossil News
Primitive and weird’ fossil looks like a tulip By Brendan Lynch, University of Kansas’ Biodiversity Institute, January 2, 2018 http://www.futurity.org/stalked-filter-feeder-siphusauctum-lloydguntheri-1644252-2/ The paper is: Julien Kimmig, Luke C. Strotz,and Bruce S. Lieberman, 2017, The stalked filter feeder Siphusauctum lloydguntheri n. sp. from the middle Cambrian (Series 3, Stage 5) Spence Shale of Utah: its biological affinities and taphonomy https://doi.org/10.1017/jpa.2017.57 Published online: 07 August 2017 http://www.bioone.org/doi/abs/10.1017/jpa.2017.57 https://www.cambridge.org/core/journals/journal-of-paleontology/article/stalked-filter-feeder-siphusauctum-lloydguntheri-n-sp-from-the-middle-cambrian-series-3-stage-5-spence-shale-of-utah-its-biological-affinities-and-taphonomy/ Yours, Paul H.- 1 reply
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- antimony canyon
- cambrian
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