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Showing results for tags 'phacopida'.
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I am fortunate enough to have such a huge amount of Middle Devonian Givetian material that I thought it best to put the older Middle Devonian stage, the Eifelian, in its own thread. There are some spectacular fossils here as well though! I thought a good place to start would be in the Formosa Reef, which I believe is quite early Eifelian. This tabulate coral and stromatoporoid reef continues similar complexes found from the Middle Silurian, see my: https://www.thefossilforum.com/topic/84678-adams-silurian/page/3/ thread from page three onwards for details. All these Formosa Reef specimens come from a delightful gift from my good friend @Monica who is a tad busy with life at the moment but is fine and still thinking of the forum. This outcrop can be found on Route 12 near Formosa/Amherstburg, Bruce County, Ontario, Canada. This beautiful-looking specimen came to me with only a third of it revealed but I managed to get it this far after nine days of painful pin prepping. Monica found another one and posted it for ID here: https://www.thefossilforum.com/topic/105528-weird-circular-imprints-formosa-reef-lower-devonian/#comment-1172285 The specimen was identified by another Canny Canadian @Kane to be the little stromatoporoid sponge Syringostroma cylindricum. Hardly a reef-builder, but gorgeous nonetheless. It does have a little thickness to it, but not much. Beautiful! Pretty thin, actually. I love this Monica, thank you!
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- acanthopyge
- acanthopyge contusa
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The Devonian period is known as "The Age of Fish", but could also be known as "The Age of Brachiopods." In the Early / Lower Devonian, brachiopods reached the height of their diversity towards its end in the Emsian. We see the ancestral groups occurring, lingulids, craniids, orthids, protorthids, pentamerids, rhynchonellids and strophomenids, as well as the later successful groups we have seen before such as atrypids, athyrids and orthotetids, plus the rise of spiriferids, spiriferinids and productids and the beginning of the terebratulids. By the end of the Devonian , several of these groups are extinct or severely reduced in importance and brachiopods never quite recover. Also, the Devonian is the last time we see trilobites with such variation, large sizes and numbers and orthocerids too are much more uncommon after the rise of the goniatites. The massive tabulate coral reefs also disappear after the Devonian. Fascinating period and I hope to share some of its wonders with you. Equally, a lot of this is rather new to me, so I would be very grateful for any assistance, corrections or further information on my specimens. Thank you. The Early Devonian epoch is split into three stages, so let's start with the first of those, the Lochkovian, that began about 419 mya and finished roughly 411 mya. I have been sent a nice selection of brachiopods from the Kalkberg Formation, Helderberg Group by the Mighty @Misha, mostly. But the kind gentleperson also sent me this fascinating little bryozoan hash : It is dominated by fenestellids, which is usually the case in the Devonian, but other orders sill occur. These ones, I think, are Fenestella, but there are so many species in the formation that I wont take a guess as to species : Not sure what this one is ;
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- aguion formation
- area de bonar
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Hello, I have an interesting Chinese trilobite I picked up which I'm unsure the name. I know it's a cheirurina and is Ordovician. Thank you!
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Hello, I am very interested in collecting trilobites and so far I nearly have one from every order (except Agnostia and a questionable Redlichiid), but though I feel I am fairly knowledgable on them overall, I am embarrassed I cannot tell the difference between species such as Phacops, Reedops, Adrisiops, Drotops, Morocops, Austerops, and Chotecops. Species like Hollarops or Morocconites are easy to tell because they have the spines or spikes though their body looks very similar. Usually when I buy trilobites they are labelled but the ones I have gotten as gifts or from rock shops are generally unlabelled. Some are easy to tell due to context (Chotecops are generally preserved in pyrite, Drotops generally being huge,) but Phacops and Reedops?! To me, they look identical, and I've heard the best way to see is counting eye facets, but several of mine have only poorly preserved or partial eyes. I also recently acquired a pair of labelled Adrisiops and I heard that they are referred to as a 'smiley Phacops' but I am not sure where that comes from. I also think the Proetid Gerastos looks quite superficially similar to all of these species, especially when poorly preserved, but I think I can tell that one apart due to it's smaller eyes and different glabella. On top of that, I am very concerned I have some fakes from the time when I was younger and did not know very much about looking for casts or composites and those can have all kinds of crazy things going on that are not in 'real' trilobites. I will try to factor out the suspicious trilobites when comparing my collection. Are there any other context clues or morphology I can look for on these similar species? Comparison photos would be nice to see the visual differences if there are any! Thank you to anyone who helps!
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From the album: My collection in progress
Morocops ovatus McKellan & Chatterton 2009 Location: Timrhanrhart Formatiom, Djebel Ouften, Morocco Age: 400 Mya (Eifelian, Middle Devonian) Measurements: 5x3 cm (trilobite), 8x7 cm (matrix) Kingdom: Animalia Phylum: Arthropoda Subphylum: Trilobitomorpha Class: Trilobita Order: Phacopida Suborder: Phacopina Family: Phacopidae -
On December 4 my mom and I traveled to the well-known Seven Stars Quarry of Seven Stars, PA a second time (#1 in a post soon!), and our goal was to find more trilobites and cephalopods. This locality is Middle Devonian Mahantango Formation shale, full of a bounty of species. We had found many Dipleura and Greenops on our previous trip, as well as the cephalopods Michelinoceras and Bactrites. Many trilobites that I found were pyritized, the golden Greenops and red Dipleura. But surprisingly, Eldredgeops is absent from the site! Nearly every Mahantango locality includes Eldredgeops rana in the fauna! It seems that the larger and more powerful Dipleura outcompeted Eldredgeops in the large predatory trilobite niche. I wanted to learn more of why Dipleura is everywhere, so I picked through a 7-foot vertical shale hill on the hunt for more clues. I grabbed a large sheet of rock with well preserved Chonetes brachiopods on it and moved it into a bucket. Then I looked back at the spot where it was and sitting there was a small, nearly complete trilobite (above). I thought it was a Greenops at first. I wrapped it in some napkins from the Rutter's nearby, because two chunks were breaking off and it needed protection from further damage. When I got home, I got out my New York Devonian fossil guide (because it's helpful for many Hamilton Group fossil IDs such as Mahantango fossils) and searched for Greenops in the trilobite section. I observed the diagrams and descriptions, and after I checked my fossil for features, I determined that I had not a Greenops but a Bellacartwrightia. This is a rare species outside New York (mainly at Penn Dixie FP), which explains why I had only found one in my multiple trips to similar sites with fossils like Penn Dixie's. I was naturally excited. But as time progressed from Dec. 4 to today, I began to get suspicious of my highly thoughtless conclusion. I had no backup species to think about, if I had made a wrong ID. Today I was reading a paper on a group of phacopids and realized that a diagram of a pygidium on the paper was almost identical to my trilobite. I came to a much more acceptable conclusion: I had a species of Asteropygine trilobite. Annoyingly, I had no knowledge of what genus/species it is AND I had accidentally posted this cool bug as an entry for IPFOTM. I need to redo it. But, overall, a rare trilobite in Asteropyginae is awesome. What a trip!
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- asteropygine
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Hello everyone, I working in dimension stone field in Armenia. This fossils where found in a sample small stone block brought for cutting to the factory, then they were machined polished as standard marble or granite tile. The tile (second photo) is 400x800mm app.16x32 inch. Kindly help me to identify these guys. Thanks
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Reconstruction of trilobite ancestral range in the southern hemisphere
Oxytropidoceras posted a topic in Fossil News
Reconstruction of trilobite ancestral range in the southern hemisphere January 10, 2019, FAPESP https://phys.org/news/2019-01-reconstruction-trilobite-ancestral-range-southern.html http://agencia.fapesp.br/reconstruction-of-trilobite-ancestral-range/29527/ Carbonaro, F.A., Langer, M.C., Nihei, S.S., de Souza Ferreira, G. and Ghilardi, R.P., 2018. Inferring ancestral range reconstruction based on trilobite records: a study-case on Metacryphaeus (Phacopida, Calmoniidae). Scientific reports, 8(1), p.15179. https://www.researchgate.net/publication/328251419_Inferring_ancestral_range_reconstruction_based_on_trilobite_records_a_study-case_on_Metacryphaeus_Phacopida_Calmoniidae https://www.nature.com/articles/s41598-018-33517-5 Bolivian Trilobites - At The Top Of The World American Museum of Natural History https://www.amnh.org/our-research/paleontology/paleontology-faq/trilobite-website/trilobite-localities/bolivian-trilobites-at-the-top-of-the-world Gallery of the Devonian Trilobites of Bolivia https://www.amnh.org/our-research/paleontology/paleontology-faq/trilobite-website/trilobite-localities/bolivian-trilobites-at-the-top-of-the-world/gallery-of-the-devonian-trilobites-of-bolivia Yours, Paul H.-
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- ancestral range
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Bought this trilobite many yrs. ago there was no info on it at all but the eyes were so great I had to have it, I am pretty sure its a Order Phacopida but that's as far as I have gone. Family, Genus and species have a dead end in my searching, Not a super piece and am sure some it is missing some of the front of the cephalon which adds to the ID but would like to display it with correct ID. Any help would be appreciated.
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From the album: America
Please DO NOT... 1) Repost this without my permission 2) Claim this as your own 3) Post it elsewhere without stating permission situation If you are planning to change this image in any way, please contact me before you do so. This image has been copyrighted. ------------------------------------------------------------------- This trilobite was given to me as a gift from a dear friend from New York. It is from the Middle Devonian of Penn Dixie, New York, USA© ©2012 ~quicksilver123
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