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Found 1,633 results

  1. Devonian Trilobite ID request.

    Photos were not taken by me so I cannot upload better ones. I was hoping someone could point me towards a species on this bug. Its 3 inches and 3/8th of an inch. Supposedly Devonian. Phacops?
  2. Is this a stromatolite?

    Is this sample from northcentral Indiana a stromatolite? Thanks in advance!
  3. hogstromhrsloegstroembrigsshunsrucklagerstincsedismachaeridiadevoniarsl1981.full.pdf A pyritized lepidocoleid machaeridian (Annelida)from the Lower Devonian Hunsruck Slate, Germany Anette E. S. Hogstrom, Derek E. G. Briggs, and Christoph Bartels Proc. R. Soc. B (2009) 276, 1981–1986 doi:10.1098/rspb.2008.1875
  4. Hi folks. Nothing spectacular, but wanted to share a first ... for me. Wet ground and high winds toppled many trees in my area last summer. I investigated an uprooted pine and noticed the shale was packed with fossils. I carried a couple of chunks home and cracked them open. The first one revealed something I haven't encountered before. A Dipleura Dekai and an Eldredge ops in the same chunk. I hope to do some more digging in the spring. Any corrections are welcomed. Thanks,
  5. Are these bryozoans?

    Are these two samples (from northcentral IN) bryozoans? The first image is 18 cm x 12 cm; the second is egg-shaped, same dimensions but has a dome. Thanks!
  6. syringopora or organ pipe coral

    I had thought syringopora and organ pipe coral were synonymous. However, I just read otherwise. How do I tell the difference? See attached photo of a fossil that's about 1 in./2.5 cm. I presumed it to be organ pipe coral. Is it? Thx!
  7. Widder Fm.: This is not Tornoceras

    I came home this afternoon in some ridiculously warm weather for January (50F, 10C) and happened to look at a rock I'd collected from the Widder formation about two or three years ago that I had sitting out weathering. It was one that @Kane had quarried from his Gonaitite perch out of the Widder formation and kicked down to me. I'd originally kept the rock because it had a bunch of Mucrospirifer thedfordensis in it and I wanted to see what else would erode out of it. When I turned the rock over I spotted a small round fossil that was brownish... a different color than most fossils. It was pyritized so I chipped it out of the rock and took a look at it. It was a Gonaitite and one that I had never seen before! Most Gonaitites that I have found at Arkona are from the Arkona formation and fall into the Tornoceras arkonense genus, but this one is different. Tornoceras arkonense above, mystery Gonaitite below. I used a new tool that I recently purchased, a home tattoo pen, to clean out one side of it. The pen is quite effective on softer shale or limestone as long as the fossil is much harder. In this case it was pyritized so I didn't have to worry about damaging the fossil. It turns out that this specimen has a smaller diameter phragmocone than Tornoceras arkonense as there are prominent ridges (rather than gaps as in T. arkonense) along the sutures. The suture pattern is plain with a sweeping parabola facing backwards, a straightish line across the keel and then another parabola. I've looked into the usual sources ("CHECK LIST OF FOSSIL INVERTEBRATES DESCRIBED FROM THE MIDDLE DEVONIAN ROCKS OF THE THEDFORD-ARKONA REGION OF SOUTHWESTERN ONTARIO", Stumm and Wright, Paleontology of New York, Hall) and don't see much that correlates to what I've found. Anyone have an idea? The fossil itself is 7/16" (11mm) at it's widest and 2/16" (4mm) thick. It comes from the Middle Devonian aged (Givetian stage) Widder formation at Hungry Hollow, Ontario, Canada. Thanks for looking!
  8. Pennsylvania Roadside Fossil

    About two weeks ago, we went to Beltzville State Park in Pennsylvania and found some great Devonian fossils, some of which have been identified with your help. On our way, though, we stopped at a Shell station for air in our tires. There was a small hill of dark grey colored rock (shale?) next to the air pump. My son and I had a quick look. We found what looks like a mussel (pictured here) and something else. I was wondering if it might be a trilobite. Any help is appreciated. I included the location and pic of the hill to help with identification. So, pictures appear like this: location, suspected mussel?, rock for example and then the fossil in question. The picture with the ruler shows the object (circled in succeeding photos). Sorry if this is confusing. Thanks. Lehighton, PA 18235
  9. Tree Fossil?

    Found this piece of sandstone in Sullivan Co., PA. It comes from either the Huntley Mtn. Fm. (Mississippian/Devonian) or the Burgoon Ss. (Mississippian). What could have made these concentric rings? They go through the rock perpendicular to bedding. It's odd that the center is mostly round but further out is more square. Could it be a tree fossil? That is the only thing I can think of.
  10. Identification

    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
  11. Went to a fossil garage sale, were the person was selling off his collection, this fall with low expectation. Found what turned out to be a very nice specimen of a Devonian Crinoid after prepping it out. My friend Tom W. tells me it is more than likely an Arthrocantha carpenteri. Wish I knew what quarry it came from, it wasn't labeled.
  12. Klein Quarry IA Crinoid

    Below is an example of a Box Crinoid I was lucky to find in 2017 with the Cedar Valley Rock and Mineral Society in 2017. This quarry can produce Devonian Phacops, Greenops, Crinoids and Fish parts, besides lots of brachiopods . Been going here and the Conklin quarries for close to a decade. Finally found a complete Crinoid. This one is a Camerate Crinoid, more common name Box Crinoid.
  13. german trilobites(dreilapper)

    wint Trilobiten aus dem Grenzbereich Emsium/Eifelium (Devon) im Raum Winterberg/Züschen (östliches Sauerland) Stephan Helling & Lothar Schöllmann Geologie und Paläontologie in Westfalen 90: 25-65 slightly more than 24 MB
  14. Hi, I spent part of the evening cutting and hand-polishing one of the Devonian stromatoporoids I found this summer and thought I'd share the results. First, a complete specimen (top and bottom of mound): Here is a cut and hand-polished face (multiple grits of sandpaper followed by polish): Here is a view through the microscope. You can see the pillar structure in the layers:
  15. Spicules or calcite crystals

    Shamlama resurrected some old images for discussion on spicules and hexactinellids. Here are a couple of photos that might be of interest from devonian sponge ( stromatoporoids) fossils found in Presque Isle County, Michigan and Alpena County, Michigan.
  16. What might this be?

    I have been able to identify (with your help) a few of the fossils we found while hunting at Beltzville state park. This is something that may be something. I tried to get the six-sided pics as recommended. What might this be (if anything)? Beltzville State Park in Pennsylvania, USA. I believe these come the Upper Devonian Mahantango Formation. Thank you.
  17. Oklahoma Trilobite

    This trilobite is labelled as Viaphacops from the Bois D'Arc Fm., Devonian, Oklahoma. Can anyone confirm and perhaps assign a specific epithet? Scale in mm.
  18. From other examples I have seen, I think these are bryozoans (sp?). Is that correct? The first example in question is the one exhibiting pencil-like structure in the center of the rock. In the second picture (of the same specimen), there seems to be a porous structure shown. The shadows may look like the mold is raised from the rock, but it is not. The fossil is an imprint (concave into the matrix). I think these are from the Upper Devonian Mahantango Formation. Thanks
  19. This was my first time at Beltzville State Park in Pennsylvania, USA. I believe these come the Upper Devonian Mahantango Formation. I saw similar examples in other posts as was hoping to confirm my guesses. Thanks 1. Horn coral? 2. Crinoid stem?- not sure if that’s something to the left of the stem. 3. Rugose coral?
  20. Hi All, I spent some time this afternoon to do some research on the brachiopod Mucrospirifer mucronatus as I was writing a blog post. I'd heard from friends a while back that someone was combining a number of species of Mucrospirifer into M. mucronatus due to similarities. I decided to see if I could find anything to verify this and would up locating a paper from 1964 where John Tillman did just that. ("Variation in Species of Mucrospirifer from Middle Devonian Rocks of Michigan, Ontario, and Ohio", John R. Tillman, Journal of Paleontology, Vol. 38, No. 5 (Sep., 1964), pp. 952-964) The TLDR of the paper is that, M. arkonensis, M. alpenensis, M. attenuatus, M. multiplicatus, and M. prolificus are combined into M. mucronatus. As well as M. profundus, M. grabaui, M. intermedia, M. latus are combined into M. thedfordensis. Furthermore I found a doctoral thesis by Delpfine Ellen Welsh from Virginia Tech that further summarized these changes as part of her study of the evolution of Mucrospirifer across West Virginia, Maryland, Pennsylvania, New York, Michigan, and Ontario. Welch, Delpfine Ellen. Geographical variation and evolution in the middle Devonian brachiopod, MUCROSPIRIFER. Diss. Virginia Tech, 1991 "The most recent systematic work is that of Tillman (1964) who studied the variation of Mucrospirifer from the Middle Devonian rocks of Michigan. Ontario. and Ohio by measuring previously described species and constructing histograms for each set of measurements. Tillman studied characters emphasized in previous descriptions: number of costae, width of costae, length of interarea, presence or absence of medial ridge in the sulcus and medial groove on the fold, presence or absence of mucronate points at the cardinal extremities, size of shell, width/length ratios, and the shape of the fold and sulcus. Tillman (1964) concluded that number of costae depends on the age and/or size of the individual, as does length of interarea. Width of costae was not constant even within a given population. Development of the medial ridge and groove in the sulcus and fold, respectively, was quite variable except in specimens from the Arkona Shale and Genshaw Formation where they are usually well formed. In observing growth lines on individual specimens. Tillman found that all previously described specimens of Mucrospirifer are mucronate at some stage in their development. This includes specimens from the Arkona Shale which as adults do not appear mucronate because of the addition of lamellae that decrease the degree of deflection at the anterior border at the cardinal extremities and increase the shell thickness wi'thout significantly changing the length or width of the specimen. Because the cardinal extremities are rarely preserved and the growth lines are very difficult to trace, Tillman determined width/length ratios to be of doubtful value. He found that as the angle made by the plane of commissure at the fold increases, the height of the fold decreases, and he also found that angle to be highly variable in all populations. The shape of the fold and sulcus and the shape and general proportions of the shell were the characters determined by Tillman (1964) to be most useful in distinguishing species. Because he observed such an overlap among the species in the range of variation for the characters studied, Tillman felt that no more than two species could be identified. Tillman retained the species M. mucronatus and M. thedfordensis and considered all the rest to be variations of these two. He placed arkonensis, attenuatus, multiplicatus, alpenensis, and prolificus into synonymy with M. mucronatus; and thedfordensis, profundus, intermedia, latus, and grabaui into synonymy with M. thedfordensis. Tillman (1964) states that "M. mucronatus (Conrad) differs from M. thedfordensis (Shimer and Grabau) in having a broadly U-shaped sulcus with flattened floor and subangular edges and a gently convex to flattened fold"; "M. thedfordensis (Shimer and Grabau) differs from M. mucronatus (Conrad) in having a U-shaped to V-shaped sulcus, never with a flattened floor; a low moderately convex fold, never with a flattened surface." This was all news to me but is helpful when identifying what I have found. This is very much a "lumper" situation where Tillman found that the variation used by others to differentiate species was not valid as it all represented different growth stages or were influenced by local environments. I don't like having to change labels every time a species or genus gets it's name changes (I'm talking about you Eldredgeops and Vinlandostrophia!) but this makes sense to me due to the similarities visually of specimens from distant locations. Besides, at least we get to keep the Mucrospirifer genus name. Thus this specimen from the Mahantango of Mucrospirifer mucronatus from the Mahantango formation in Pennsylvania is now the same species .... As this this formerly Mucrospirifer arkonensis example from the Arkona formation of Ontario is.
  21. Last Devonian fieldtrip of the year

    This Monday we went on the last fieldtrip for this year, the weather forcast was cold but sunny so a good excuse to get out. We took te dog along and went to the quarry, A lonely excavator was operating in the far end of the pit, I went for a quick chat to let him know we were prospecting in the other side of the quarry and to ask if it was no issue for him. The fossil rich deposits had'nt moved since our last visit, but we still did find a few cephalopods. Natalie found a very promising one, the goniatite looks to be preserved completely in white calcite, I cant wait to get that one out of the matrix. For me the find of the day was a rare Carinoceras sp. goniatite , I have only a handfull of those at home, but this one is very well preserved and not compressed. Enjoy the pictures: Toto the dog prospecting the slates First goniatite of the day credits yo Natalie. a Tornoceras sp. A nice loose orthocone on the scree pile: The wite goniatite from Natalie: A large but wethered one on the scree pile. The Carinoceras sp.
  22. Last hunt of the year!

    Here in Central New York, we have had the pleasure of fairly decent weather, for the past week. The temperature has been high enough to melt most of the snow. Today I needed to get the boys out of the house. I decided to go to Deep Springs and do a hunt while the boys shot their BB guns. We only stayed for about 1 and a half hours. It was nice to be out there. I dont think that i have been on a hunt anywhere since September? I was being picky about what i was bringing home. Some trilo bits and pieces along with a few other things. First up a Dipleura cephalon.
  23. Crinoid ID from Keyser formation

    Hi all, Another couple of mysteries that I found at an old quarry near Mapleton, PA and are from the Keyser formation which is thought to straddle the boundary between the Silurian and Devonian periods. The layers they were found in were close to layers of the Tonoloway formation which is Upper Silurian in age. I found one item that I believe is a Mariacrinus pachydactylus based on the Paleontology of New York, Part 3, Vol 2, Plate 3. It's been preserved by a black colored Chert but I don't want to acid etch it any more that I have (about an hour in vinegar). The other oddball is this UFO shaped specimen. I've found similar examples before but I ruined any chance of seeing detail on the surface by soaking them in vinegar. This is the first example I've found since then. Close examination with a lens and microscope does not show any detail so it may need to be cleaned a bit more. The "Bottom" has a nick in it or maybe it was where a stalk attached? Any thoughts? Thanks for looking!
  24. About eight years ago I posted about some odd fossils that I found in the Keyser formation limestone and the consensus was that they were roots of Hexactinellid sponges (glass sponges). @piranha dug up some pretty good evidence that these are indeed from Hexactinellid sponges. I recently visited the quarry again over my Christmas break and found more examples. I'm wondering if there are some fresh takes on what these may be and if anyone has found something similar? For reference, these come from an old quarry near Mapleton, PA and are from the Keyser formation which is thought to straddle the boundary between the Silurian and Devonian periods. The layers they were found in were close to layers of the Tonoloway formation which is Upper Silurian in age. Specimen #1 - This is the most interesting example I've found as the threads all seem to come from a central area and radiate out. Also note that they are layered and some have hook like endings. Specimen #2 - This is a large plate with many clusters of these threads criss-crossing each other, but all in relatively same direction. Specimen #3 - This is the first example I have that is associated with any other fauna. The Brachiopod is a small Atrypa reticularis Thanks for looking and any suggestions are welcomed.