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Showing results for tags 'devonian'.
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A few of the adult Manticoceras sp. specimens that I found last year in Belgium
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From the album: Invertebrates
Orthoceras sp. Early Devonian Early Emsian Bundenbach Germany -
Conularia bundenbachia Richter & Richter, 1930
oilshale posted a gallery image in Member Collections
From the album: Invertebrates
Conularia bundenbachia Richter & Richter, 1930 Early Devonian Hunsrueck Shale Bundenbach Germany -
I'm revisiting an old chunk that I acquired some years ago in a batch of assorted fossils, some without names or locations. I posted this one a while back but there are newer members now, so thought I'd see it there is any more insight on it. It's nothing spectacular, and I need to make room so am thinking of passing it on, but before I do it'd be nice to have a better idea of the location. Does it look like something that could have come from Arkona, or is it more likely to belong with the 'Rocky Mountain Corals' I got in the same lot? It's classic heavy, clinky limestone. Hopefully the pics are ok (and not too big).. The sun has not exactly been plentiful here lately and won't be for some days yet, but I have to get this show on the road so I'm relegated to taking imperfect pics indoors, again....
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I was going through some containers from a few years back when I returned to collecting, and it had a bunch of pieces I had collected from my mixed fill location (lower to mid Devonian). I came across this little pygidium. The squares are 5 mm x 5 mm. Going through some of the literature to compare photo plates from Ludvigsen and Lesperance, as well as scanning the Proetids in Levi-Setti and Whittington, there just didn't seem to be a perfect match. The axis sits fairly high on this one, a little like Mannopyge halli, but unlike the M. halli does not have the terminal nodes. The axis "points" downward rather dramatically, and has some apparent incisions. There is a small but distinct margin on the pygidium that made me think one of the Dechenella types. I've tentatively labeled it Pseudodechenella although I am not comfortable with that identification for this one. The Pseudodechenella I usually find don't have this very pronounced axial feature, and usually have a kind of smoother shell on the pygidium. I may be overthinking this, but I put this one out there for our Devo bug experts. Much appreciated for any help on this one.
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From the album: Trilobites
Taxonomy: Pseudodechenella sp (partial cephalon and pygidium) Age: Lower Devonian (Bois Blanc Fm) Location: London, Canada (imported fill from Niagara escarpment) Source: Field Collection- 2 comments
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From the album: Invertebrates
Zaphrentis sp. Early Devonian Hunsrueck Slate Bundenbach Germany -
From the album: Invertebrates
Protospongia rhenana Schlueter, 1892 Early Devonian Hunsrueck Slate Bundenbach Germany -
Hi everyone, In 2011, I hunted for fossils in an area which is called the Eifel (Germany). This area is known for it's Devonian fossils, especially trilobites, corals and brachiopods. I have visited the Eifel several times, the last time I went there was 2016. The Eifel is rich of locations to hunt, so in 2011, I went to one of them, a small quarry which was overgrown by many plants. The fossils I discovered that day, were many parts of crinoides and a lot of brachiopods. I'm not sure anymore but I think the rocks of the quarry are Givetian or Eifelian age. When I left the quarry after a few hours, I picked up a stone with a strange structure on it. As a 11 year old, I didn't knew what it was. I posted pictures of it on the Dutch fossil forum last year and I was told that it could be parts of a placoderm, an armored fish. I was excited, because placoderm fossils are very rare in the Eifel. But I am stil not hundred percent sure so I was wondering what you think. Is it fish or is it something else, like a coral? Thanks in advance and greetings, Lars
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Trilobite - real or fabrication?
Arizona Rex posted a topic in Is It Real? How to Recognize Fossil Fabrications
Greetings, I received this trilobite (Quadrops Philonyx I was told) from an acquaintance about two years ago. While grateful, I soon grabbed my magnifier and tried to determine its authenticity. Not being an expert by any stretch, my first assumption is that this piece is not real, but a fabrication. I hesitate to use the word "fake" as perhaps its initial purpose was to be used as a model or teaching guide. Over the holidays I showed this piece to a family member and they suggested that perhaps this was not a fabrication, but perhaps a real trilobite that had been badly prepared by someone who was unskilled at the task. While I am still heavily on the side of fabrication, again not being an expert, I would sincerely appreciate any and all help concluding real or fabrication. Thank you.
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So My missus drove me out to Arkona for one last stab at Arkona for 2017. It was cold, but I had to get out and play for one last time. This pic shows the south pit in the morning. A lot was under ice. As I was walking to an already existing bench, this was by my foot. One of many orphaned coral "pies."
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Once upon a time there lived a common ancestor of humans and ..... sharks
Kasia posted a topic in Fossil News
This news would explain a very broad smile of ... hmmmm... Julia Roberts*, for instance https://phys.org/news/2018-01-million-year-old-shark-humans-sharks-common.html *Just kidding - I hope there are no Julia Roberts' die-hard fans here....- 2 replies
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The hubbub of the holidays is over. The cold, crisp air has descended here in the Mid-Atlantic. The ground is frozen, but I was craving sunshine and the hunt. With blue skies today and the promise of snow tomorrow, I headed to the one place I was reasonably certain wouldn't be completely frozen -- the Delaware Bay. After all, we put salt on the roads here to keep them from freezing. How cold is it this week? Cold enough to freeze salt water! Here and there, exposed spots dotted the beach and the highest part of the bank, above the high tide line, was still exposed. There were a few pebbles here and there, but the odds of finding something in such scant gravel wasn't promising. I spent the next hour with a friend, exploring the ice formations with cameras. Still, my beloved beach did not disappoint. I found a couple of little favosites corals in the freezing tide pools and a 3-inch chunk of local petrified wood lying along the trash line. There is something ironic about finding petrified - silicified - wood frozen to the beach sand!
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Found among imported fill from various locations, all Devonian (Dundee Fm, Amherstberg Fm, and Bois Blanc Fm). The Amherstberg Formation occurs above the Bois Blanc, and beneath the Lucas. Trilobites in the Amherstberg are quite rare as this formation is generally dominated by reef-building corals and stromatoporoids. The more common trilobite (although still relatively rare in this formation) would be Crassiproetus, followed by Mannopyge halli, Mystrocephalus, Acanthopyge, and Harpidella species. Initially described by Hall as Proetus verneuli by Hall (1861), then Stumm (1953) as Dechenella halli, it was later renamed Mannopyge halli by Rolf Ludvigsen (1986). Whole specimens are not yet known, but cranidia, pygidia, and some thoracic segments have been reported. "A warburgelline with pear-shaped glabella, deep sigmoid 1s furrow, narrow (tr.) and faint 2s and 3s furrows; no preglabellar field, tropidium, or tropidial ridges. Large eyes located anterior of cephalic midlength; genal spines short. Semicircular pygidium lacks a flat border,-axis with 9 - 10 node-bearing rings, eight faint pleural furrows and incised interpleural furrows, each pygidial rib terminates abaxially as a rounded node isolated by moderately deep paradoublural furrow." (Ludvigsen, 1987 p. 683). This species is well defined by its rounded nodes (shown in the picture), with the name "Mannopyge" being a combination of "manno" (necklace) and "pyge" (tail). As trilobites in this formation are rare, this is a somewhat exceptional find. I have yet to find any other examples of this trilobite in the collecting area. A big thanks to @piranha for his expertise in identifying this find. Sources: Ludvigsen, R. (1987). Reef trilobites from the Formosa Limestone (Lower Devonian) of southern Ontario. Canadian Journal of Earth Sciences 24. 676-88.
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From the album: Invertebrates
Cordania falcata Whittington, 1960 Early Devonian Haragan Formation Coal County Oklahoma -
Here are a couple more I picked out of the Arkona mud. I put my guesses at the bottom but would like to see what you guys think. #1 These range from 5-10 mm The shape is roughly a 3 sided pyramid with 120/30/30 degree angles Some are pyritized but the others have a very faint lateral ridge pattern #2 My guess: #1 - Conulariid #2 - Fragment of a Devonaster arm Edit: adding one I forgot #3
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My submission for the world's smallest trilobite contest and more stuff from Arkona 12/4/2017
Greg.Wood posted a topic in Fossil Hunting Trips
It was only 9 days since my previous (and first) trip to HH, but I was itching to go back and decided to take advantage of the mild weather this Monday. I spent most of the day on the north side of the south pit picking tiny fossils out of the mud. There are an astonishing variety of critters to find if you don't mind lying face down in the dirt. 1. Tiny trilobites! I was not expecting to find any trilobites until I spotted the guy on the left. Luckily I had a small ziplock bag or I would have lost these for sure. They are about 2.5 and 3.0 mm across the head. 2. Nautiloids Fragments like these are most common after brachiopod and crinoid bits 3. Ammonites/goniatites Also very common but one of my favorites, I will never find enough of these. 4. Brachiopods and bivalves Fragments everywhere but a bit harder to find complete 5. Another brach Nothing special, just nicely inflated and good detail on both sides 6. Another brach A little more interesting. I only found one like this. 7. Gastropod I found many fragments that suggest this shape but this one is by far the most compete. 8. Crinoid stem fragments Very abundant but these ones caught my eye 9. Part of a crinoid calyx? (opposite sides of the same piece shown) 10. Cystoid plates Could be wrong, I just learned about cystoids so I'm bound to imagine seeing them everywhere
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Identification based on page 63 of "Ostracods of the Middle Devonian Silica Formation" by Kesling and Chilman (1978). This was a float sample
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Identification based page 54 of "Ostracods of the Middle Devonian Silica Formation" by Kesling and Chilman (1978)
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Identified based on key table on page 70 of "Ostracods of the Middle Devonian Silica Formation" by Kesling and Chilman (1978).
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Reassessment of the Devonian Problematicum Protonympha
Oxytropidoceras posted a topic in Fossil News
I can see that Dr. Retallack is stirring up more controversy and keeping paleontologists on their toes. Retallack, G.J., 2017, Reassessment of the Devonian problematicum Protonympha as another post-Ediacaran vendobiont. Lethia. First published: 8 December 2017 DOI: 10.1111/let.12253 http://onlinelibrary.wiley.com/doi/10.1111/let.12253/abstract http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1502-3931 http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1502-3931/earlyview Related papers are: Conway Morris, S. and Grazhdankin, D., 2005. Enigmatic worm-like organisms from the upper Devonian of New York: an apparent example of Ediacaran-like preservation. Palaeontology, 48(2), pp. 395-410. DOI 10.1111/j.1475-4983.2005.00449.x http://onlinelibrary.wiley.com/doi/10.1111/j.1475-4983.2005.00449.x/abstract https://www.academia.edu/2896860/Enigmatic_worm-like_organisms_from_the_Upper_Devonian_of_New_York_an_apparent_example_of_Ediacaran-like_preservation https://ipgg.academia.edu/DmitriyGrazhdankin Conway M.S., and Grazhdankin D., 2006. A post-script to the enigmatic Protonympha (Devonian; New York): is it an arm of the echinoderms?. Palaeontology. 2006 Nov 1;49(6): 1335-1338. http://onlinelibrary.wiley.com/doi/10.1111/j.1475-4983.2006.00601.x/abstract https://www.academia.edu/2899643/A_post-script_to_the_enigmatic_Protonympha_Devonian_New_York_is_it_an_arm_of_the_echinoderms https://ipgg.academia.edu/DmitriyGrazhdankin Yours, Paul H.- 9 replies
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I got these from a friend years ago, but i do not knwo what it is. I only know that these are from Devonian.
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Any idea what the other items besides the trilobites are in this Devonian era matrix? Especially the anchor shaped item. Sorry I forgot to put something for size reference but you can kind of get a idea from the pair of scissors in the pic.
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I found this at Hungry Hollow in Arkona, Ontario. Sadly I can't remember which formation I pulled it from but my understanding is they are all Devonian age. It may just be a coral fragment but I've heard fish bones can be found. Any ideas?
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Head shield, and eyes of cephalaspis, and other dermal bones or plates, spines, of armored Devonian fish. In various stages of development. From the Knoydart Formation, Nova Scotia. This formation is similar to that of the "old red sandstone" of Europe, similar in fossils and mode of preservation. I do not know much yet of Devonian fish fossils, if anyone can comment and let me know more about these that would be great! Thank you. These are my first vertebrate fossils that I have found, last week. I have only ever found invertebrates.
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